/**************************************************************************/
/*  resource_importer_scene.cpp                                           */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#include "resource_importer_scene.h"

#include "core/error/error_macros.h"
#include "core/io/resource_saver.h"
#include "editor/editor_node.h"
#include "editor/import/scene_import_settings.h"
#include "scene/3d/area_3d.h"
#include "scene/3d/collision_shape_3d.h"
#include "scene/3d/importer_mesh_instance_3d.h"
#include "scene/3d/mesh_instance_3d.h"
#include "scene/3d/navigation_region_3d.h"
#include "scene/3d/occluder_instance_3d.h"
#include "scene/3d/physics_body_3d.h"
#include "scene/3d/vehicle_body_3d.h"
#include "scene/animation/animation_player.h"
#include "scene/resources/animation.h"
#include "scene/resources/box_shape_3d.h"
#include "scene/resources/importer_mesh.h"
#include "scene/resources/packed_scene.h"
#include "scene/resources/resource_format_text.h"
#include "scene/resources/separation_ray_shape_3d.h"
#include "scene/resources/sphere_shape_3d.h"
#include "scene/resources/surface_tool.h"
#include "scene/resources/world_boundary_shape_3d.h"

uint32_t EditorSceneFormatImporter::get_import_flags() const {
	uint32_t ret;
	if (GDVIRTUAL_CALL(_get_import_flags, ret)) {
		return ret;
	}

	ERR_FAIL_V(0);
}

void EditorSceneFormatImporter::get_extensions(List<String> *r_extensions) const {
	Vector<String> arr;
	if (GDVIRTUAL_CALL(_get_extensions, arr)) {
		for (int i = 0; i < arr.size(); i++) {
			r_extensions->push_back(arr[i]);
		}
		return;
	}

	ERR_FAIL();
}

Node *EditorSceneFormatImporter::import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err) {
	Dictionary options_dict;
	for (const KeyValue<StringName, Variant> &elem : p_options) {
		options_dict[elem.key] = elem.value;
	}
	Object *ret = nullptr;
	if (GDVIRTUAL_CALL(_import_scene, p_path, p_flags, options_dict, ret)) {
		return Object::cast_to<Node>(ret);
	}

	ERR_FAIL_V(nullptr);
}

void EditorSceneFormatImporter::get_import_options(const String &p_path, List<ResourceImporter::ImportOption> *r_options) {
	GDVIRTUAL_CALL(_get_import_options, p_path);
}

Variant EditorSceneFormatImporter::get_option_visibility(const String &p_path, bool p_for_animation, const String &p_option, const HashMap<StringName, Variant> &p_options) {
	Variant ret;
	GDVIRTUAL_CALL(_get_option_visibility, p_path, p_for_animation, p_option, ret);
	return ret;
}

void EditorSceneFormatImporter::_bind_methods() {
	GDVIRTUAL_BIND(_get_import_flags);
	GDVIRTUAL_BIND(_get_extensions);
	GDVIRTUAL_BIND(_import_scene, "path", "flags", "options");
	GDVIRTUAL_BIND(_get_import_options, "path");
	GDVIRTUAL_BIND(_get_option_visibility, "path", "for_animation", "option");

	BIND_CONSTANT(IMPORT_SCENE);
	BIND_CONSTANT(IMPORT_ANIMATION);
	BIND_CONSTANT(IMPORT_FAIL_ON_MISSING_DEPENDENCIES);
	BIND_CONSTANT(IMPORT_GENERATE_TANGENT_ARRAYS);
	BIND_CONSTANT(IMPORT_USE_NAMED_SKIN_BINDS);
	BIND_CONSTANT(IMPORT_DISCARD_MESHES_AND_MATERIALS);
}

/////////////////////////////////
void EditorScenePostImport::_bind_methods() {
	GDVIRTUAL_BIND(_post_import, "scene")
	ClassDB::bind_method(D_METHOD("get_source_file"), &EditorScenePostImport::get_source_file);
}

Node *EditorScenePostImport::post_import(Node *p_scene) {
	Object *ret;
	if (GDVIRTUAL_CALL(_post_import, p_scene, ret)) {
		return Object::cast_to<Node>(ret);
	}

	return p_scene;
}

String EditorScenePostImport::get_source_file() const {
	return source_file;
}

void EditorScenePostImport::init(const String &p_source_file) {
	source_file = p_source_file;
}

EditorScenePostImport::EditorScenePostImport() {
}

///////////////////////////////////////////////////////

Variant EditorScenePostImportPlugin::get_option_value(const StringName &p_name) const {
	ERR_FAIL_COND_V_MSG(current_options == nullptr && current_options_dict == nullptr, Variant(), "get_option_value called from a function where option values are not available.");
	ERR_FAIL_COND_V_MSG(current_options && !current_options->has(p_name), Variant(), "get_option_value called with unexisting option argument: " + String(p_name));
	ERR_FAIL_COND_V_MSG(current_options_dict && !current_options_dict->has(p_name), Variant(), "get_option_value called with unexisting option argument: " + String(p_name));
	if (current_options && current_options->has(p_name)) {
		return (*current_options)[p_name];
	}
	if (current_options_dict && current_options_dict->has(p_name)) {
		return (*current_options_dict)[p_name];
	}
	return Variant();
}
void EditorScenePostImportPlugin::add_import_option(const String &p_name, Variant p_default_value) {
	ERR_FAIL_COND_MSG(current_option_list == nullptr, "add_import_option() can only be called from get_import_options()");
	add_import_option_advanced(p_default_value.get_type(), p_name, p_default_value);
}
void EditorScenePostImportPlugin::add_import_option_advanced(Variant::Type p_type, const String &p_name, Variant p_default_value, PropertyHint p_hint, const String &p_hint_string, int p_usage_flags) {
	ERR_FAIL_COND_MSG(current_option_list == nullptr, "add_import_option_advanced() can only be called from get_import_options()");
	current_option_list->push_back(ResourceImporter::ImportOption(PropertyInfo(p_type, p_name, p_hint, p_hint_string, p_usage_flags), p_default_value));
}

void EditorScenePostImportPlugin::get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) {
	current_option_list = r_options;
	GDVIRTUAL_CALL(_get_internal_import_options, p_category);
	current_option_list = nullptr;
}
Variant EditorScenePostImportPlugin::get_internal_option_visibility(InternalImportCategory p_category, bool p_for_animation, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	current_options = &p_options;
	Variant ret;
	GDVIRTUAL_CALL(_get_internal_option_visibility, p_category, p_for_animation, p_option, ret);
	current_options = nullptr;
	return ret;
}
Variant EditorScenePostImportPlugin::get_internal_option_update_view_required(InternalImportCategory p_category, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	current_options = &p_options;
	Variant ret;
	GDVIRTUAL_CALL(_get_internal_option_update_view_required, p_category, p_option, ret);
	current_options = nullptr;
	return ret;
}

void EditorScenePostImportPlugin::internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) {
	current_options_dict = &p_options;
	GDVIRTUAL_CALL(_internal_process, p_category, p_base_scene, p_node, p_resource);
	current_options_dict = nullptr;
}

void EditorScenePostImportPlugin::get_import_options(const String &p_path, List<ResourceImporter::ImportOption> *r_options) {
	current_option_list = r_options;
	GDVIRTUAL_CALL(_get_import_options, p_path);
	current_option_list = nullptr;
}
Variant EditorScenePostImportPlugin::get_option_visibility(const String &p_path, bool p_for_animation, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	current_options = &p_options;
	Variant ret;
	GDVIRTUAL_CALL(_get_option_visibility, p_path, p_for_animation, p_option, ret);
	current_options = nullptr;
	return ret;
}

void EditorScenePostImportPlugin::pre_process(Node *p_scene, const HashMap<StringName, Variant> &p_options) {
	current_options = &p_options;
	GDVIRTUAL_CALL(_pre_process, p_scene);
	current_options = nullptr;
}
void EditorScenePostImportPlugin::post_process(Node *p_scene, const HashMap<StringName, Variant> &p_options) {
	current_options = &p_options;
	GDVIRTUAL_CALL(_post_process, p_scene);
	current_options = nullptr;
}

void EditorScenePostImportPlugin::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_option_value", "name"), &EditorScenePostImportPlugin::get_option_value);

	ClassDB::bind_method(D_METHOD("add_import_option", "name", "value"), &EditorScenePostImportPlugin::add_import_option);
	ClassDB::bind_method(D_METHOD("add_import_option_advanced", "type", "name", "default_value", "hint", "hint_string", "usage_flags"), &EditorScenePostImportPlugin::add_import_option_advanced, DEFVAL(PROPERTY_HINT_NONE), DEFVAL(""), DEFVAL(PROPERTY_USAGE_DEFAULT));

	GDVIRTUAL_BIND(_get_internal_import_options, "category");
	GDVIRTUAL_BIND(_get_internal_option_visibility, "category", "for_animation", "option");
	GDVIRTUAL_BIND(_get_internal_option_update_view_required, "category", "option");
	GDVIRTUAL_BIND(_internal_process, "category", "base_node", "node", "resource");
	GDVIRTUAL_BIND(_get_import_options, "path");
	GDVIRTUAL_BIND(_get_option_visibility, "path", "for_animation", "option");
	GDVIRTUAL_BIND(_pre_process, "scene");
	GDVIRTUAL_BIND(_post_process, "scene");

	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_NODE);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_MESH);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_MATERIAL);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_ANIMATION);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE);
	BIND_ENUM_CONSTANT(INTERNAL_IMPORT_CATEGORY_MAX);
}

/////////////////////////////////////////////////////////

String ResourceImporterScene::get_importer_name() const {
	return animation_importer ? "animation_library" : "scene";
}

String ResourceImporterScene::get_visible_name() const {
	return animation_importer ? "Animation Library" : "Scene";
}

void ResourceImporterScene::get_recognized_extensions(List<String> *p_extensions) const {
	for (Ref<EditorSceneFormatImporter> importer_elem : importers) {
		importer_elem->get_extensions(p_extensions);
	}
}

String ResourceImporterScene::get_save_extension() const {
	return animation_importer ? "res" : "scn";
}

String ResourceImporterScene::get_resource_type() const {
	return animation_importer ? "AnimationLibrary" : "PackedScene";
}

int ResourceImporterScene::get_format_version() const {
	return 1;
}

bool ResourceImporterScene::get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	if (animation_importer) {
		if (p_option == "animation/import") { // Option ignored, animation always imported.
			return false;
		}
	} else if (p_option.begins_with("animation/")) {
		if (p_option != "animation/import" && !bool(p_options["animation/import"])) {
			return false;
		}
	}

	if (animation_importer && (p_option.begins_with("nodes/") || p_option.begins_with("meshes/") || p_option.begins_with("skins/"))) {
		return false; // Nothing to do here for animations.
	}

	if (p_option == "meshes/lightmap_texel_size" && int(p_options["meshes/light_baking"]) != 2) {
		// Only display the lightmap texel size import option when using the Static Lightmaps light baking mode.
		return false;
	}

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		Variant ret = post_importer_plugins.write[i]->get_option_visibility(p_path, animation_importer, p_option, p_options);
		if (ret.get_type() == Variant::BOOL) {
			return ret;
		}
	}

	for (Ref<EditorSceneFormatImporter> importer : importers) {
		Variant ret = importer->get_option_visibility(p_path, animation_importer, p_option, p_options);
		if (ret.get_type() == Variant::BOOL) {
			return ret;
		}
	}

	return true;
}

int ResourceImporterScene::get_preset_count() const {
	return 0;
}

String ResourceImporterScene::get_preset_name(int p_idx) const {
	return String();
}

static bool _teststr(const String &p_what, const String &p_str) {
	String what = p_what;

	//remove trailing spaces and numbers, some apps like blender add ".number" to duplicates so also compensate for this
	while (what.length() && (is_digit(what[what.length() - 1]) || what[what.length() - 1] <= 32 || what[what.length() - 1] == '.')) {
		what = what.substr(0, what.length() - 1);
	}

	if (what.findn("$" + p_str) != -1) { //blender and other stuff
		return true;
	}
	if (what.to_lower().ends_with("-" + p_str)) { //collada only supports "_" and "-" besides letters
		return true;
	}
	if (what.to_lower().ends_with("_" + p_str)) { //collada only supports "_" and "-" besides letters
		return true;
	}
	return false;
}

static String _fixstr(const String &p_what, const String &p_str) {
	String what = p_what;

	//remove trailing spaces and numbers, some apps like blender add ".number" to duplicates so also compensate for this
	while (what.length() && (is_digit(what[what.length() - 1]) || what[what.length() - 1] <= 32 || what[what.length() - 1] == '.')) {
		what = what.substr(0, what.length() - 1);
	}

	String end = p_what.substr(what.length(), p_what.length() - what.length());

	if (what.findn("$" + p_str) != -1) { //blender and other stuff
		return what.replace("$" + p_str, "") + end;
	}
	if (what.to_lower().ends_with("-" + p_str)) { //collada only supports "_" and "-" besides letters
		return what.substr(0, what.length() - (p_str.length() + 1)) + end;
	}
	if (what.to_lower().ends_with("_" + p_str)) { //collada only supports "_" and "-" besides letters
		return what.substr(0, what.length() - (p_str.length() + 1)) + end;
	}
	return what;
}

static void _pre_gen_shape_list(Ref<ImporterMesh> &mesh, Vector<Ref<Shape3D>> &r_shape_list, bool p_convex) {
	ERR_FAIL_NULL_MSG(mesh, "Cannot generate shape list with null mesh value");
	if (!p_convex) {
		Ref<ConcavePolygonShape3D> shape = mesh->create_trimesh_shape();
		r_shape_list.push_back(shape);
	} else {
		Vector<Ref<Shape3D>> cd;
		cd.push_back(mesh->create_convex_shape(true, /*Passing false, otherwise VHACD will be used to simplify (Decompose) the Mesh.*/ false));
		if (cd.size()) {
			for (int i = 0; i < cd.size(); i++) {
				r_shape_list.push_back(cd[i]);
			}
		}
	}
}

struct ScalableNodeCollection {
	HashSet<Node3D *> node_3ds;
	HashSet<Ref<ImporterMesh>> importer_meshes;
	HashSet<Ref<Skin>> skins;
	HashSet<Ref<Animation>> animations;
};

void _rescale_importer_mesh(Vector3 p_scale, Ref<ImporterMesh> p_mesh, bool is_shadow = false) {
	// MESH and SKIN data divide, to compensate for object position multiplying.

	const int surf_count = p_mesh->get_surface_count();
	const int blendshape_count = p_mesh->get_blend_shape_count();
	struct LocalSurfData {
		Mesh::PrimitiveType prim = {};
		Array arr;
		Array bsarr;
		Dictionary lods;
		String name;
		Ref<Material> mat;
		int fmt_compress_flags = 0;
	};

	Vector<LocalSurfData> surf_data_by_mesh;

	Vector<String> blendshape_names;
	for (int bsidx = 0; bsidx < blendshape_count; bsidx++) {
		blendshape_names.append(p_mesh->get_blend_shape_name(bsidx));
	}

	for (int surf_idx = 0; surf_idx < surf_count; surf_idx++) {
		Mesh::PrimitiveType prim = p_mesh->get_surface_primitive_type(surf_idx);
		const int fmt_compress_flags = p_mesh->get_surface_format(surf_idx);
		Array arr = p_mesh->get_surface_arrays(surf_idx);
		String name = p_mesh->get_surface_name(surf_idx);
		Dictionary lods;
		Ref<Material> mat = p_mesh->get_surface_material(surf_idx);
		{
			Vector<Vector3> vertex_array = arr[ArrayMesh::ARRAY_VERTEX];
			for (int vert_arr_i = 0; vert_arr_i < vertex_array.size(); vert_arr_i++) {
				vertex_array.write[vert_arr_i] = vertex_array[vert_arr_i] * p_scale;
			}
			arr[ArrayMesh::ARRAY_VERTEX] = vertex_array;
		}
		Array blendshapes;
		for (int bsidx = 0; bsidx < blendshape_count; bsidx++) {
			Array current_bsarr = p_mesh->get_surface_blend_shape_arrays(surf_idx, bsidx);
			Vector<Vector3> current_bs_vertex_array = current_bsarr[ArrayMesh::ARRAY_VERTEX];
			int current_bs_vert_arr_len = current_bs_vertex_array.size();
			for (int32_t bs_vert_arr_i = 0; bs_vert_arr_i < current_bs_vert_arr_len; bs_vert_arr_i++) {
				current_bs_vertex_array.write[bs_vert_arr_i] = current_bs_vertex_array[bs_vert_arr_i] * p_scale;
			}
			current_bsarr[ArrayMesh::ARRAY_VERTEX] = current_bs_vertex_array;
			blendshapes.push_back(current_bsarr);
		}

		LocalSurfData surf_data_dictionary = LocalSurfData();
		surf_data_dictionary.prim = prim;
		surf_data_dictionary.arr = arr;
		surf_data_dictionary.bsarr = blendshapes;
		surf_data_dictionary.lods = lods;
		surf_data_dictionary.fmt_compress_flags = fmt_compress_flags;
		surf_data_dictionary.name = name;
		surf_data_dictionary.mat = mat;

		surf_data_by_mesh.push_back(surf_data_dictionary);
	}

	p_mesh->clear();

	for (int bsidx = 0; bsidx < blendshape_count; bsidx++) {
		p_mesh->add_blend_shape(blendshape_names[bsidx]);
	}

	for (int surf_idx = 0; surf_idx < surf_count; surf_idx++) {
		const Mesh::PrimitiveType prim = surf_data_by_mesh[surf_idx].prim;
		const Array arr = surf_data_by_mesh[surf_idx].arr;
		const Array bsarr = surf_data_by_mesh[surf_idx].bsarr;
		const Dictionary lods = surf_data_by_mesh[surf_idx].lods;
		const int fmt_compress_flags = surf_data_by_mesh[surf_idx].fmt_compress_flags;
		const String name = surf_data_by_mesh[surf_idx].name;
		const Ref<Material> mat = surf_data_by_mesh[surf_idx].mat;

		p_mesh->add_surface(prim, arr, bsarr, lods, mat, name, fmt_compress_flags);
	}

	if (!is_shadow && p_mesh->get_shadow_mesh() != p_mesh && p_mesh->get_shadow_mesh().is_valid()) {
		_rescale_importer_mesh(p_scale, p_mesh->get_shadow_mesh(), true);
	}
}

void _rescale_skin(Vector3 p_scale, Ref<Skin> p_skin) {
	// MESH and SKIN data divide, to compensate for object position multiplying.
	for (int i = 0; i < p_skin->get_bind_count(); i++) {
		Transform3D transform = p_skin->get_bind_pose(i);
		p_skin->set_bind_pose(i, Transform3D(transform.basis, p_scale * transform.origin));
	}
}

void _rescale_animation(Vector3 p_scale, Ref<Animation> p_animation) {
	for (int track_idx = 0; track_idx < p_animation->get_track_count(); track_idx++) {
		if (p_animation->track_get_type(track_idx) == Animation::TYPE_POSITION_3D) {
			for (int key_idx = 0; key_idx < p_animation->track_get_key_count(track_idx); key_idx++) {
				Vector3 value = p_animation->track_get_key_value(track_idx, key_idx);
				value = p_scale * value;
				p_animation->track_set_key_value(track_idx, key_idx, value);
			}
		}
	}
}

void _apply_scale_to_scalable_node_collection(ScalableNodeCollection &p_collection, Vector3 p_scale) {
	for (Node3D *node_3d : p_collection.node_3ds) {
		node_3d->set_position(p_scale * node_3d->get_position());
		Skeleton3D *skeleton_3d = Object::cast_to<Skeleton3D>(node_3d);
		if (skeleton_3d) {
			for (int i = 0; i < skeleton_3d->get_bone_count(); i++) {
				Transform3D rest = skeleton_3d->get_bone_rest(i);
				skeleton_3d->set_bone_rest(i, Transform3D(rest.basis, p_scale * rest.origin));
				skeleton_3d->set_bone_pose_position(i, p_scale * rest.origin);
			}
		}
	}
	for (Ref<ImporterMesh> mesh : p_collection.importer_meshes) {
		_rescale_importer_mesh(p_scale, mesh, false);
	}
	for (Ref<Skin> skin : p_collection.skins) {
		_rescale_skin(p_scale, skin);
	}
	for (Ref<Animation> animation : p_collection.animations) {
		_rescale_animation(p_scale, animation);
	}
}

void _populate_scalable_nodes_collection(Node *p_node, ScalableNodeCollection &p_collection) {
	if (!p_node) {
		return;
	}
	Node3D *node_3d = Object::cast_to<Node3D>(p_node);
	if (node_3d) {
		p_collection.node_3ds.insert(node_3d);
		ImporterMeshInstance3D *mesh_instance_3d = Object::cast_to<ImporterMeshInstance3D>(p_node);
		if (mesh_instance_3d) {
			Ref<ImporterMesh> mesh = mesh_instance_3d->get_mesh();
			if (mesh.is_valid()) {
				p_collection.importer_meshes.insert(mesh);
			}
			Ref<Skin> skin = mesh_instance_3d->get_skin();
			if (skin.is_valid()) {
				p_collection.skins.insert(skin);
			}
		}
	}
	AnimationPlayer *animation_player = Object::cast_to<AnimationPlayer>(p_node);
	if (animation_player) {
		List<StringName> animation_list;
		animation_player->get_animation_list(&animation_list);

		for (const StringName &E : animation_list) {
			Ref<Animation> animation = animation_player->get_animation(E);
			p_collection.animations.insert(animation);
		}
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *child = p_node->get_child(i);
		_populate_scalable_nodes_collection(child, p_collection);
	}
}

void _apply_permanent_scale_to_descendants(Node *p_root_node, Vector3 p_scale) {
	ScalableNodeCollection scalable_node_collection;
	_populate_scalable_nodes_collection(p_root_node, scalable_node_collection);
	_apply_scale_to_scalable_node_collection(scalable_node_collection, p_scale);
}

Node *ResourceImporterScene::_pre_fix_node(Node *p_node, Node *p_root, HashMap<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> &r_collision_map, Pair<PackedVector3Array, PackedInt32Array> *r_occluder_arrays, List<Pair<NodePath, Node *>> &r_node_renames) {
	// Children first.
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *r = _pre_fix_node(p_node->get_child(i), p_root, r_collision_map, r_occluder_arrays, r_node_renames);
		if (!r) {
			i--; // Was erased.
		}
	}

	String name = p_node->get_name();
	NodePath original_path = p_root->get_path_to(p_node); // Used to detect renames due to import hints.

	bool isroot = p_node == p_root;

	if (!isroot && _teststr(name, "noimp")) {
		p_node->set_owner(nullptr);
		memdelete(p_node);
		return nullptr;
	}

	if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> m = mi->get_mesh();

		if (m.is_valid()) {
			for (int i = 0; i < m->get_surface_count(); i++) {
				Ref<BaseMaterial3D> mat = m->get_surface_material(i);
				if (!mat.is_valid()) {
					continue;
				}

				if (_teststr(mat->get_name(), "alpha")) {
					mat->set_transparency(BaseMaterial3D::TRANSPARENCY_ALPHA);
					mat->set_name(_fixstr(mat->get_name(), "alpha"));
				}
				if (_teststr(mat->get_name(), "vcol")) {
					mat->set_flag(BaseMaterial3D::FLAG_ALBEDO_FROM_VERTEX_COLOR, true);
					mat->set_flag(BaseMaterial3D::FLAG_SRGB_VERTEX_COLOR, true);
					mat->set_name(_fixstr(mat->get_name(), "vcol"));
				}
			}
		}
	}

	if (Object::cast_to<AnimationPlayer>(p_node)) {
		AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(p_node);

		// Node paths in animation tracks are relative to the following path (this is used to fix node paths below).
		Node *ap_root = ap->get_node(ap->get_root());
		NodePath path_prefix = p_root->get_path_to(ap_root);

		bool nodes_were_renamed = r_node_renames.size() != 0;

		List<StringName> anims;
		ap->get_animation_list(&anims);
		for (const StringName &E : anims) {
			Ref<Animation> anim = ap->get_animation(E);
			ERR_CONTINUE(anim.is_null());

			// Remove animation tracks referencing non-importable nodes.
			for (int i = 0; i < anim->get_track_count(); i++) {
				NodePath path = anim->track_get_path(i);

				for (int j = 0; j < path.get_name_count(); j++) {
					String node = path.get_name(j);
					if (_teststr(node, "noimp")) {
						anim->remove_track(i);
						i--;
						break;
					}
				}
			}

			// Fix node paths in animations, in case nodes were renamed earlier due to import hints.
			if (nodes_were_renamed) {
				for (int i = 0; i < anim->get_track_count(); i++) {
					NodePath path = anim->track_get_path(i);
					// Convert track path to absolute node path without subnames (some manual work because we are not in the scene tree).
					Vector<StringName> absolute_path_names = path_prefix.get_names();
					absolute_path_names.append_array(path.get_names());
					NodePath absolute_path(absolute_path_names, false);
					absolute_path.simplify();
					// Fix paths to renamed nodes.
					for (const Pair<NodePath, Node *> &F : r_node_renames) {
						if (F.first == absolute_path) {
							NodePath new_path(ap_root->get_path_to(F.second).get_names(), path.get_subnames(), false);
							print_verbose(vformat("Fix: Correcting node path in animation track: %s should be %s", path, new_path));
							anim->track_set_path(i, new_path);
							break; // Only one match is possible.
						}
					}
				}
			}

			String animname = E;
			const int loop_string_count = 3;
			static const char *loop_strings[loop_string_count] = { "loop_mode", "loop", "cycle" };
			for (int i = 0; i < loop_string_count; i++) {
				if (_teststr(animname, loop_strings[i])) {
					anim->set_loop_mode(Animation::LOOP_LINEAR);
					animname = _fixstr(animname, loop_strings[i]);

					Ref<AnimationLibrary> library = ap->get_animation_library(ap->find_animation_library(anim));
					library->rename_animation(E, animname);
				}
			}
		}
	}

	if (_teststr(name, "colonly") || _teststr(name, "convcolonly")) {
		if (isroot) {
			return p_node;
		}

		String fixed_name;
		if (_teststr(name, "colonly")) {
			fixed_name = _fixstr(name, "colonly");
		} else if (_teststr(name, "convcolonly")) {
			fixed_name = _fixstr(name, "convcolonly");
		}

		ERR_FAIL_COND_V(fixed_name.is_empty(), nullptr);

		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);
		if (mi) {
			Ref<ImporterMesh> mesh = mi->get_mesh();

			if (mesh.is_valid()) {
				Vector<Ref<Shape3D>> shapes;
				if (r_collision_map.has(mesh)) {
					shapes = r_collision_map[mesh];
				} else if (_teststr(name, "colonly")) {
					_pre_gen_shape_list(mesh, shapes, false);
					r_collision_map[mesh] = shapes;
				} else if (_teststr(name, "convcolonly")) {
					_pre_gen_shape_list(mesh, shapes, true);
					r_collision_map[mesh] = shapes;
				}

				if (shapes.size()) {
					StaticBody3D *col = memnew(StaticBody3D);
					col->set_transform(mi->get_transform());
					col->set_name(fixed_name);
					p_node->replace_by(col);
					p_node->set_owner(nullptr);
					memdelete(p_node);
					p_node = col;

					_add_shapes(col, shapes);
				}
			}

		} else if (p_node->has_meta("empty_draw_type")) {
			String empty_draw_type = String(p_node->get_meta("empty_draw_type"));
			StaticBody3D *sb = memnew(StaticBody3D);
			sb->set_name(fixed_name);
			Object::cast_to<Node3D>(sb)->set_transform(Object::cast_to<Node3D>(p_node)->get_transform());
			p_node->replace_by(sb);
			p_node->set_owner(nullptr);
			memdelete(p_node);
			p_node = sb;
			CollisionShape3D *colshape = memnew(CollisionShape3D);
			if (empty_draw_type == "CUBE") {
				BoxShape3D *boxShape = memnew(BoxShape3D);
				boxShape->set_size(Vector3(2, 2, 2));
				colshape->set_shape(boxShape);
			} else if (empty_draw_type == "SINGLE_ARROW") {
				SeparationRayShape3D *rayShape = memnew(SeparationRayShape3D);
				rayShape->set_length(1);
				colshape->set_shape(rayShape);
				Object::cast_to<Node3D>(sb)->rotate_x(Math_PI / 2);
			} else if (empty_draw_type == "IMAGE") {
				WorldBoundaryShape3D *world_boundary_shape = memnew(WorldBoundaryShape3D);
				colshape->set_shape(world_boundary_shape);
			} else {
				SphereShape3D *sphereShape = memnew(SphereShape3D);
				sphereShape->set_radius(1);
				colshape->set_shape(sphereShape);
			}
			sb->add_child(colshape, true);
			colshape->set_owner(sb->get_owner());
		}

	} else if (_teststr(name, "rigid") && Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		if (isroot) {
			return p_node;
		}

		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);
		Ref<ImporterMesh> mesh = mi->get_mesh();

		if (mesh.is_valid()) {
			Vector<Ref<Shape3D>> shapes;
			if (r_collision_map.has(mesh)) {
				shapes = r_collision_map[mesh];
			} else {
				_pre_gen_shape_list(mesh, shapes, true);
			}

			RigidBody3D *rigid_body = memnew(RigidBody3D);
			rigid_body->set_name(_fixstr(name, "rigid_body"));
			p_node->replace_by(rigid_body);
			rigid_body->set_transform(mi->get_transform());
			p_node = rigid_body;
			mi->set_transform(Transform3D());
			rigid_body->add_child(mi, true);
			mi->set_owner(rigid_body->get_owner());

			_add_shapes(rigid_body, shapes);
		}

	} else if ((_teststr(name, "col") || (_teststr(name, "convcol"))) && Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> mesh = mi->get_mesh();

		if (mesh.is_valid()) {
			Vector<Ref<Shape3D>> shapes;
			String fixed_name;
			if (r_collision_map.has(mesh)) {
				shapes = r_collision_map[mesh];
			} else if (_teststr(name, "col")) {
				_pre_gen_shape_list(mesh, shapes, false);
				r_collision_map[mesh] = shapes;
			} else if (_teststr(name, "convcol")) {
				_pre_gen_shape_list(mesh, shapes, true);
				r_collision_map[mesh] = shapes;
			}

			if (_teststr(name, "col")) {
				fixed_name = _fixstr(name, "col");
			} else if (_teststr(name, "convcol")) {
				fixed_name = _fixstr(name, "convcol");
			}

			if (!fixed_name.is_empty()) {
				if (mi->get_parent() && !mi->get_parent()->has_node(fixed_name)) {
					mi->set_name(fixed_name);
				}
			}

			if (shapes.size()) {
				StaticBody3D *col = memnew(StaticBody3D);
				mi->add_child(col, true);
				col->set_owner(mi->get_owner());

				_add_shapes(col, shapes);
			}
		}

	} else if (_teststr(name, "navmesh") && Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		if (isroot) {
			return p_node;
		}

		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> mesh = mi->get_mesh();
		ERR_FAIL_COND_V(mesh.is_null(), nullptr);
		NavigationRegion3D *nmi = memnew(NavigationRegion3D);

		nmi->set_name(_fixstr(name, "navmesh"));
		Ref<NavigationMesh> nmesh = mesh->create_navigation_mesh();
		nmi->set_navigation_mesh(nmesh);
		Object::cast_to<Node3D>(nmi)->set_transform(mi->get_transform());
		p_node->replace_by(nmi);
		p_node->set_owner(nullptr);
		memdelete(p_node);
		p_node = nmi;
	} else if (_teststr(name, "occ") || _teststr(name, "occonly")) {
		if (isroot) {
			return p_node;
		}
		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);
		if (mi) {
			Ref<ImporterMesh> mesh = mi->get_mesh();

			if (mesh.is_valid()) {
				if (r_occluder_arrays) {
					OccluderInstance3D::bake_single_node(mi, 0.0f, r_occluder_arrays->first, r_occluder_arrays->second);
				}
				if (_teststr(name, "occ")) {
					String fixed_name = _fixstr(name, "occ");
					if (!fixed_name.is_empty()) {
						if (mi->get_parent() && !mi->get_parent()->has_node(fixed_name)) {
							mi->set_name(fixed_name);
						}
					}
				} else {
					p_node->set_owner(nullptr);
					memdelete(p_node);
					p_node = nullptr;
				}
			}
		}
	} else if (_teststr(name, "vehicle")) {
		if (isroot) {
			return p_node;
		}

		Node *owner = p_node->get_owner();
		Node3D *s = Object::cast_to<Node3D>(p_node);
		VehicleBody3D *bv = memnew(VehicleBody3D);
		String n = _fixstr(p_node->get_name(), "vehicle");
		bv->set_name(n);
		p_node->replace_by(bv);
		p_node->set_name(n);
		bv->add_child(p_node);
		bv->set_owner(owner);
		p_node->set_owner(owner);
		bv->set_transform(s->get_transform());
		s->set_transform(Transform3D());

		p_node = bv;
	} else if (_teststr(name, "wheel")) {
		if (isroot) {
			return p_node;
		}

		Node *owner = p_node->get_owner();
		Node3D *s = Object::cast_to<Node3D>(p_node);
		VehicleWheel3D *bv = memnew(VehicleWheel3D);
		String n = _fixstr(p_node->get_name(), "wheel");
		bv->set_name(n);
		p_node->replace_by(bv);
		p_node->set_name(n);
		bv->add_child(p_node);
		bv->set_owner(owner);
		p_node->set_owner(owner);
		bv->set_transform(s->get_transform());
		s->set_transform(Transform3D());

		p_node = bv;
	} else if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		//last attempt, maybe collision inside the mesh data

		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> mesh = mi->get_mesh();
		if (!mesh.is_null()) {
			Vector<Ref<Shape3D>> shapes;
			if (r_collision_map.has(mesh)) {
				shapes = r_collision_map[mesh];
			} else if (_teststr(mesh->get_name(), "col")) {
				_pre_gen_shape_list(mesh, shapes, false);
				r_collision_map[mesh] = shapes;
				mesh->set_name(_fixstr(mesh->get_name(), "col"));
			} else if (_teststr(mesh->get_name(), "convcol")) {
				_pre_gen_shape_list(mesh, shapes, true);
				r_collision_map[mesh] = shapes;
				mesh->set_name(_fixstr(mesh->get_name(), "convcol"));
			} else if (_teststr(mesh->get_name(), "occ")) {
				if (r_occluder_arrays) {
					OccluderInstance3D::bake_single_node(mi, 0.0f, r_occluder_arrays->first, r_occluder_arrays->second);
				}
				mesh->set_name(_fixstr(mesh->get_name(), "occ"));
			}

			if (shapes.size()) {
				StaticBody3D *col = memnew(StaticBody3D);
				p_node->add_child(col, true);
				col->set_owner(p_node->get_owner());

				_add_shapes(col, shapes);
			}
		}
	}

	if (p_node) {
		NodePath new_path = p_root->get_path_to(p_node);
		if (new_path != original_path) {
			print_verbose(vformat("Fix: Renamed %s to %s", original_path, new_path));
			r_node_renames.push_back({ original_path, p_node });
		}
	}

	return p_node;
}

Node *ResourceImporterScene::_pre_fix_animations(Node *p_node, Node *p_root, const Dictionary &p_node_data, const Dictionary &p_animation_data, float p_animation_fps) {
	// children first
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *r = _pre_fix_animations(p_node->get_child(i), p_root, p_node_data, p_animation_data, p_animation_fps);
		if (!r) {
			i--; //was erased
		}
	}

	String import_id = p_node->get_meta("import_id", "PATH:" + p_root->get_path_to(p_node));

	Dictionary node_settings;
	if (p_node_data.has(import_id)) {
		node_settings = p_node_data[import_id];
	}

	{
		//make sure this is unique
		node_settings = node_settings.duplicate(true);
		//fill node settings for this node with default values
		List<ImportOption> iopts;
		get_internal_import_options(INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE, &iopts);
		for (const ImportOption &E : iopts) {
			if (!node_settings.has(E.option.name)) {
				node_settings[E.option.name] = E.default_value;
			}
		}
	}

	if (Object::cast_to<AnimationPlayer>(p_node)) {
		AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(p_node);
		List<StringName> anims;
		ap->get_animation_list(&anims);

		for (const StringName &name : anims) {
			Ref<Animation> anim = ap->get_animation(name);
			Array animation_slices;

			if (p_animation_data.has(name)) {
				Dictionary anim_settings = p_animation_data[name];
				int slices_count = anim_settings["slices/amount"];

				for (int i = 0; i < slices_count; i++) {
					String slice_name = anim_settings["slice_" + itos(i + 1) + "/name"];
					int from_frame = anim_settings["slice_" + itos(i + 1) + "/start_frame"];
					int end_frame = anim_settings["slice_" + itos(i + 1) + "/end_frame"];
					Animation::LoopMode loop_mode = static_cast<Animation::LoopMode>((int)anim_settings["slice_" + itos(i + 1) + "/loop_mode"]);
					bool save_to_file = anim_settings["slice_" + itos(i + 1) + "/save_to_file/enabled"];
					bool save_to_path = anim_settings["slice_" + itos(i + 1) + "/save_to_file/path"];
					bool save_to_file_keep_custom = anim_settings["slice_" + itos(i + 1) + "/save_to_file/keep_custom_tracks"];

					animation_slices.push_back(slice_name);
					animation_slices.push_back(from_frame / p_animation_fps);
					animation_slices.push_back(end_frame / p_animation_fps);
					animation_slices.push_back(loop_mode);
					animation_slices.push_back(save_to_file);
					animation_slices.push_back(save_to_path);
					animation_slices.push_back(save_to_file_keep_custom);
				}
			}

			if (animation_slices.size() > 0) {
				_create_slices(ap, anim, animation_slices, true);
			}
		}

		AnimationImportTracks import_tracks_mode[TRACK_CHANNEL_MAX] = {
			AnimationImportTracks(int(node_settings["import_tracks/position"])),
			AnimationImportTracks(int(node_settings["import_tracks/rotation"])),
			AnimationImportTracks(int(node_settings["import_tracks/scale"]))
		};

		if (anims.size() > 1 && (import_tracks_mode[0] != ANIMATION_IMPORT_TRACKS_IF_PRESENT || import_tracks_mode[1] != ANIMATION_IMPORT_TRACKS_IF_PRESENT || import_tracks_mode[2] != ANIMATION_IMPORT_TRACKS_IF_PRESENT)) {
			_optimize_track_usage(ap, import_tracks_mode);
		}
	}

	return p_node;
}

Node *ResourceImporterScene::_post_fix_animations(Node *p_node, Node *p_root, const Dictionary &p_node_data, const Dictionary &p_animation_data, float p_animation_fps) {
	// children first
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *r = _post_fix_animations(p_node->get_child(i), p_root, p_node_data, p_animation_data, p_animation_fps);
		if (!r) {
			i--; //was erased
		}
	}

	String import_id = p_node->get_meta("import_id", "PATH:" + p_root->get_path_to(p_node));

	Dictionary node_settings;
	if (p_node_data.has(import_id)) {
		node_settings = p_node_data[import_id];
	}

	{
		//make sure this is unique
		node_settings = node_settings.duplicate(true);
		//fill node settings for this node with default values
		List<ImportOption> iopts;
		get_internal_import_options(INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE, &iopts);
		for (const ImportOption &E : iopts) {
			if (!node_settings.has(E.option.name)) {
				node_settings[E.option.name] = E.default_value;
			}
		}
	}

	if (Object::cast_to<AnimationPlayer>(p_node)) {
		AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(p_node);

		bool use_optimizer = node_settings["optimizer/enabled"];
		float anim_optimizer_linerr = node_settings["optimizer/max_velocity_error"];
		float anim_optimizer_angerr = node_settings["optimizer/max_angular_error"];
		int anim_optimizer_preerr = node_settings["optimizer/max_precision_error"];

		if (use_optimizer) {
			_optimize_animations(ap, anim_optimizer_linerr, anim_optimizer_angerr, anim_optimizer_preerr);
		}

		bool use_compression = node_settings["compression/enabled"];
		int anim_compression_page_size = node_settings["compression/page_size"];

		if (use_compression) {
			_compress_animations(ap, anim_compression_page_size);
		}

		List<StringName> anims;
		ap->get_animation_list(&anims);
		for (const StringName &name : anims) {
			Ref<Animation> anim = ap->get_animation(name);
			if (p_animation_data.has(name)) {
				Dictionary anim_settings = p_animation_data[name];
				{
					//fill with default values
					List<ImportOption> iopts;
					get_internal_import_options(INTERNAL_IMPORT_CATEGORY_ANIMATION, &iopts);
					for (const ImportOption &F : iopts) {
						if (!anim_settings.has(F.option.name)) {
							anim_settings[F.option.name] = F.default_value;
						}
					}
				}

				anim->set_loop_mode(static_cast<Animation::LoopMode>((int)anim_settings["settings/loop_mode"]));
				bool save = anim_settings["save_to_file/enabled"];
				String path = anim_settings["save_to_file/path"];
				bool keep_custom = anim_settings["save_to_file/keep_custom_tracks"];

				Ref<Animation> saved_anim = _save_animation_to_file(anim, save, path, keep_custom);

				if (saved_anim != anim) {
					Ref<AnimationLibrary> al = ap->get_animation_library(ap->find_animation_library(anim));
					al->add_animation(name, saved_anim); //replace
				}
			}
		}
	}

	return p_node;
}

Node *ResourceImporterScene::_post_fix_node(Node *p_node, Node *p_root, HashMap<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> &collision_map, Pair<PackedVector3Array, PackedInt32Array> &r_occluder_arrays, HashSet<Ref<ImporterMesh>> &r_scanned_meshes, const Dictionary &p_node_data, const Dictionary &p_material_data, const Dictionary &p_animation_data, float p_animation_fps, float p_applied_root_scale) {
	// children first
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *r = _post_fix_node(p_node->get_child(i), p_root, collision_map, r_occluder_arrays, r_scanned_meshes, p_node_data, p_material_data, p_animation_data, p_animation_fps, p_applied_root_scale);
		if (!r) {
			i--; //was erased
		}
	}

	bool isroot = p_node == p_root;

	String import_id = p_node->get_meta("import_id", "PATH:" + p_root->get_path_to(p_node));

	Dictionary node_settings;
	if (p_node_data.has(import_id)) {
		node_settings = p_node_data[import_id];
	}

	if (!isroot && (node_settings.has("import/skip_import") && bool(node_settings["import/skip_import"]))) {
		p_node->set_owner(nullptr);
		memdelete(p_node);
		return nullptr;
	}

	{
		//make sure this is unique
		node_settings = node_settings.duplicate(true);
		//fill node settings for this node with default values
		List<ImportOption> iopts;
		if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
			get_internal_import_options(INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE, &iopts);
		} else if (Object::cast_to<AnimationPlayer>(p_node)) {
			get_internal_import_options(INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE, &iopts);
		} else if (Object::cast_to<Skeleton3D>(p_node)) {
			get_internal_import_options(INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE, &iopts);
		} else {
			get_internal_import_options(INTERNAL_IMPORT_CATEGORY_NODE, &iopts);
		}
		for (const ImportOption &E : iopts) {
			if (!node_settings.has(E.option.name)) {
				node_settings[E.option.name] = E.default_value;
			}
		}
	}

	{
		ObjectID node_id = p_node->get_instance_id();
		for (int i = 0; i < post_importer_plugins.size(); i++) {
			post_importer_plugins.write[i]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_NODE, p_root, p_node, Ref<Resource>(), node_settings);
			if (ObjectDB::get_instance(node_id) == nullptr) { //may have been erased, so do not continue
				break;
			}
		}
	}

	if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		ObjectID node_id = p_node->get_instance_id();
		for (int i = 0; i < post_importer_plugins.size(); i++) {
			post_importer_plugins.write[i]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE, p_root, p_node, Ref<Resource>(), node_settings);
			if (ObjectDB::get_instance(node_id) == nullptr) { //may have been erased, so do not continue
				break;
			}
		}
	}

	if (Object::cast_to<Skeleton3D>(p_node)) {
		ObjectID node_id = p_node->get_instance_id();
		for (int i = 0; i < post_importer_plugins.size(); i++) {
			post_importer_plugins.write[i]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE, p_root, p_node, Ref<Resource>(), node_settings);
			if (ObjectDB::get_instance(node_id) == nullptr) { //may have been erased, so do not continue
				break;
			}
		}
	}

	if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> m = mi->get_mesh();

		if (m.is_valid()) {
			if (!r_scanned_meshes.has(m)) {
				for (int i = 0; i < m->get_surface_count(); i++) {
					Ref<Material> mat = m->get_surface_material(i);
					if (mat.is_valid()) {
						String mat_id = mat->get_meta("import_id", mat->get_name());

						if (!mat_id.is_empty() && p_material_data.has(mat_id)) {
							Dictionary matdata = p_material_data[mat_id];
							{
								//fill node settings for this node with default values
								List<ImportOption> iopts;
								get_internal_import_options(INTERNAL_IMPORT_CATEGORY_MATERIAL, &iopts);
								for (const ImportOption &E : iopts) {
									if (!matdata.has(E.option.name)) {
										matdata[E.option.name] = E.default_value;
									}
								}
							}

							for (int j = 0; j < post_importer_plugins.size(); j++) {
								post_importer_plugins.write[j]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MATERIAL, p_root, p_node, mat, matdata);
							}

							if (matdata.has("use_external/enabled") && bool(matdata["use_external/enabled"]) && matdata.has("use_external/path")) {
								String path = matdata["use_external/path"];
								Ref<Material> external_mat = ResourceLoader::load(path);
								if (external_mat.is_valid()) {
									m->set_surface_material(i, external_mat);
								}
							}
						}
					}
				}

				r_scanned_meshes.insert(m);
			}

			if (node_settings.has("generate/physics")) {
				int mesh_physics_mode = MeshPhysicsMode::MESH_PHYSICS_DISABLED;

				const bool generate_collider = node_settings["generate/physics"];
				if (generate_collider) {
					mesh_physics_mode = MeshPhysicsMode::MESH_PHYSICS_MESH_AND_STATIC_COLLIDER;
					if (node_settings.has("physics/body_type")) {
						const BodyType body_type = (BodyType)node_settings["physics/body_type"].operator int();
						switch (body_type) {
							case BODY_TYPE_STATIC:
								mesh_physics_mode = MeshPhysicsMode::MESH_PHYSICS_MESH_AND_STATIC_COLLIDER;
								break;
							case BODY_TYPE_DYNAMIC:
								mesh_physics_mode = MeshPhysicsMode::MESH_PHYSICS_RIGID_BODY_AND_MESH;
								break;
							case BODY_TYPE_AREA:
								mesh_physics_mode = MeshPhysicsMode::MESH_PHYSICS_AREA_ONLY;
								break;
						}
					}
				}

				if (mesh_physics_mode != MeshPhysicsMode::MESH_PHYSICS_DISABLED) {
					Vector<Ref<Shape3D>> shapes;
					if (collision_map.has(m)) {
						shapes = collision_map[m];
					} else {
						shapes = get_collision_shapes(
								m,
								node_settings,
								p_applied_root_scale);
					}

					if (shapes.size()) {
						CollisionObject3D *base = nullptr;
						switch (mesh_physics_mode) {
							case MESH_PHYSICS_MESH_AND_STATIC_COLLIDER: {
								StaticBody3D *col = memnew(StaticBody3D);
								p_node->add_child(col, true);
								col->set_owner(p_node->get_owner());
								col->set_transform(get_collision_shapes_transform(node_settings));
								col->set_position(p_applied_root_scale * col->get_position());
								base = col;
							} break;
							case MESH_PHYSICS_RIGID_BODY_AND_MESH: {
								RigidBody3D *rigid_body = memnew(RigidBody3D);
								rigid_body->set_name(p_node->get_name());
								p_node->replace_by(rigid_body);
								rigid_body->set_transform(mi->get_transform() * get_collision_shapes_transform(node_settings));
								rigid_body->set_position(p_applied_root_scale * rigid_body->get_position());
								p_node = rigid_body;
								mi->set_transform(Transform3D());
								rigid_body->add_child(mi, true);
								mi->set_owner(rigid_body->get_owner());
								base = rigid_body;
							} break;
							case MESH_PHYSICS_STATIC_COLLIDER_ONLY: {
								StaticBody3D *col = memnew(StaticBody3D);
								col->set_transform(mi->get_transform() * get_collision_shapes_transform(node_settings));
								col->set_position(p_applied_root_scale * col->get_position());
								col->set_name(p_node->get_name());
								p_node->replace_by(col);
								p_node->set_owner(nullptr);
								memdelete(p_node);
								p_node = col;
								base = col;
							} break;
							case MESH_PHYSICS_AREA_ONLY: {
								Area3D *area = memnew(Area3D);
								area->set_transform(mi->get_transform() * get_collision_shapes_transform(node_settings));
								area->set_position(p_applied_root_scale * area->get_position());
								area->set_name(p_node->get_name());
								p_node->replace_by(area);
								p_node->set_owner(nullptr);
								memdelete(p_node);
								p_node = area;
								base = area;

							} break;
						}

						for (const Ref<Shape3D> &E : shapes) {
							CollisionShape3D *cshape = memnew(CollisionShape3D);
							cshape->set_shape(E);
							base->add_child(cshape, true);

							cshape->set_owner(base->get_owner());
						}
					}
				}
			}
		}
	}

	//navmesh (node may have changed type above)
	if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> m = mi->get_mesh();

		if (m.is_valid()) {
			if (node_settings.has("generate/navmesh")) {
				int navmesh_mode = node_settings["generate/navmesh"];

				if (navmesh_mode != NAVMESH_DISABLED) {
					NavigationRegion3D *nmi = memnew(NavigationRegion3D);

					Ref<NavigationMesh> nmesh = m->create_navigation_mesh();
					nmi->set_navigation_mesh(nmesh);

					if (navmesh_mode == NAVMESH_NAVMESH_ONLY) {
						nmi->set_transform(mi->get_transform());
						p_node->replace_by(nmi);
						p_node->set_owner(nullptr);
						memdelete(p_node);
						p_node = nmi;
					} else {
						mi->add_child(nmi, true);
						nmi->set_owner(mi->get_owner());
					}
				}
			}
		}
	}

	if (Object::cast_to<ImporterMeshInstance3D>(p_node)) {
		ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(p_node);

		Ref<ImporterMesh> m = mi->get_mesh();

		if (m.is_valid()) {
			if (node_settings.has("generate/occluder")) {
				int occluder_mode = node_settings["generate/occluder"];

				if (occluder_mode != OCCLUDER_DISABLED) {
					float simplification_dist = 0.0f;
					if (node_settings.has("occluder/simplification_distance")) {
						simplification_dist = node_settings["occluder/simplification_distance"];
					}

					OccluderInstance3D::bake_single_node(mi, simplification_dist, r_occluder_arrays.first, r_occluder_arrays.second);

					if (occluder_mode == OCCLUDER_OCCLUDER_ONLY) {
						p_node->set_owner(nullptr);
						memdelete(p_node);
						p_node = nullptr;
					}
				}
			}
		}
	}

	if (Object::cast_to<AnimationPlayer>(p_node)) {
		AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(p_node);

		for (int i = 0; i < post_importer_plugins.size(); i++) {
			post_importer_plugins.write[i]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE, p_root, p_node, Ref<Resource>(), node_settings);
		}

		if (post_importer_plugins.size()) {
			List<StringName> anims;
			ap->get_animation_list(&anims);
			for (const StringName &name : anims) {
				if (p_animation_data.has(name)) {
					Ref<Animation> anim = ap->get_animation(name);
					Dictionary anim_settings = p_animation_data[name];
					{
						//fill with default values
						List<ImportOption> iopts;
						get_internal_import_options(INTERNAL_IMPORT_CATEGORY_ANIMATION, &iopts);
						for (const ImportOption &F : iopts) {
							if (!anim_settings.has(F.option.name)) {
								anim_settings[F.option.name] = F.default_value;
							}
						}
					}

					for (int i = 0; i < post_importer_plugins.size(); i++) {
						post_importer_plugins.write[i]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_ANIMATION, p_root, p_node, anim, anim_settings);
					}
				}
			}
		}
	}

	return p_node;
}

Ref<Animation> ResourceImporterScene::_save_animation_to_file(Ref<Animation> anim, bool p_save_to_file, String p_save_to_path, bool p_keep_custom_tracks) {
	if (!p_save_to_file || !p_save_to_path.is_resource_file()) {
		return anim;
	}

	if (FileAccess::exists(p_save_to_path) && p_keep_custom_tracks) {
		// Copy custom animation tracks from previously imported files.
		Ref<Animation> old_anim = ResourceLoader::load(p_save_to_path, "Animation", ResourceFormatLoader::CACHE_MODE_IGNORE);
		if (old_anim.is_valid()) {
			for (int i = 0; i < old_anim->get_track_count(); i++) {
				if (!old_anim->track_is_imported(i)) {
					old_anim->copy_track(i, anim);
				}
			}
			anim->set_loop_mode(old_anim->get_loop_mode());
		}
	}

	if (ResourceCache::has(p_save_to_path)) {
		Ref<Animation> old_anim = ResourceCache::get_ref(p_save_to_path);
		if (old_anim.is_valid()) {
			old_anim->copy_from(anim);
			anim = old_anim;
		}
	}
	anim->set_path(p_save_to_path, true); // Set path to save externally.
	Error err = ResourceSaver::save(anim, p_save_to_path, ResourceSaver::FLAG_CHANGE_PATH);
	ERR_FAIL_COND_V_MSG(err != OK, anim, "Saving of animation failed: " + p_save_to_path);
	return anim;
}

void ResourceImporterScene::_create_slices(AnimationPlayer *ap, Ref<Animation> anim, const Array &p_slices, bool p_bake_all) {
	Ref<AnimationLibrary> al = ap->get_animation_library(ap->find_animation_library(anim));

	for (int i = 0; i < p_slices.size(); i += 7) {
		String name = p_slices[i];
		float from = p_slices[i + 1];
		float to = p_slices[i + 2];
		Animation::LoopMode loop_mode = static_cast<Animation::LoopMode>((int)p_slices[i + 3]);
		bool save_to_file = p_slices[i + 4];
		String save_to_path = p_slices[i + 5];
		bool keep_current = p_slices[i + 6];
		if (from >= to) {
			continue;
		}

		Ref<Animation> new_anim = memnew(Animation);

		for (int j = 0; j < anim->get_track_count(); j++) {
			List<float> keys;
			int kc = anim->track_get_key_count(j);
			int dtrack = -1;
			for (int k = 0; k < kc; k++) {
				float kt = anim->track_get_key_time(j, k);
				if (kt >= from && kt < to) {
					//found a key within range, so create track
					if (dtrack == -1) {
						new_anim->add_track(anim->track_get_type(j));
						dtrack = new_anim->get_track_count() - 1;
						new_anim->track_set_path(dtrack, anim->track_get_path(j));

						if (kt > (from + 0.01) && k > 0) {
							if (anim->track_get_type(j) == Animation::TYPE_POSITION_3D) {
								Vector3 p;
								anim->position_track_interpolate(j, from, &p);
								new_anim->position_track_insert_key(dtrack, 0, p);
							} else if (anim->track_get_type(j) == Animation::TYPE_ROTATION_3D) {
								Quaternion r;
								anim->rotation_track_interpolate(j, from, &r);
								new_anim->rotation_track_insert_key(dtrack, 0, r);
							} else if (anim->track_get_type(j) == Animation::TYPE_SCALE_3D) {
								Vector3 s;
								anim->scale_track_interpolate(j, from, &s);
								new_anim->scale_track_insert_key(dtrack, 0, s);
							} else if (anim->track_get_type(j) == Animation::TYPE_VALUE) {
								Variant var = anim->value_track_interpolate(j, from);
								new_anim->track_insert_key(dtrack, 0, var);
							} else if (anim->track_get_type(j) == Animation::TYPE_BLEND_SHAPE) {
								float interp;
								anim->blend_shape_track_interpolate(j, from, &interp);
								new_anim->blend_shape_track_insert_key(dtrack, 0, interp);
							}
						}
					}

					if (anim->track_get_type(j) == Animation::TYPE_POSITION_3D) {
						Vector3 p;
						anim->position_track_get_key(j, k, &p);
						new_anim->position_track_insert_key(dtrack, kt - from, p);
					} else if (anim->track_get_type(j) == Animation::TYPE_ROTATION_3D) {
						Quaternion r;
						anim->rotation_track_get_key(j, k, &r);
						new_anim->rotation_track_insert_key(dtrack, kt - from, r);
					} else if (anim->track_get_type(j) == Animation::TYPE_SCALE_3D) {
						Vector3 s;
						anim->scale_track_get_key(j, k, &s);
						new_anim->scale_track_insert_key(dtrack, kt - from, s);
					} else if (anim->track_get_type(j) == Animation::TYPE_VALUE) {
						Variant var = anim->track_get_key_value(j, k);
						new_anim->track_insert_key(dtrack, kt - from, var);
					} else if (anim->track_get_type(j) == Animation::TYPE_BLEND_SHAPE) {
						float interp;
						anim->blend_shape_track_get_key(j, k, &interp);
						new_anim->blend_shape_track_insert_key(dtrack, kt - from, interp);
					}
				}

				if (dtrack != -1 && kt >= to) {
					if (anim->track_get_type(j) == Animation::TYPE_POSITION_3D) {
						Vector3 p;
						anim->position_track_interpolate(j, to, &p);
						new_anim->position_track_insert_key(dtrack, to - from, p);
					} else if (anim->track_get_type(j) == Animation::TYPE_ROTATION_3D) {
						Quaternion r;
						anim->rotation_track_interpolate(j, to, &r);
						new_anim->rotation_track_insert_key(dtrack, to - from, r);
					} else if (anim->track_get_type(j) == Animation::TYPE_SCALE_3D) {
						Vector3 s;
						anim->scale_track_interpolate(j, to, &s);
						new_anim->scale_track_insert_key(dtrack, to - from, s);
					} else if (anim->track_get_type(j) == Animation::TYPE_VALUE) {
						Variant var = anim->value_track_interpolate(j, to);
						new_anim->track_insert_key(dtrack, to - from, var);
					} else if (anim->track_get_type(j) == Animation::TYPE_BLEND_SHAPE) {
						float interp;
						anim->blend_shape_track_interpolate(j, to, &interp);
						new_anim->blend_shape_track_insert_key(dtrack, to - from, interp);
					}
				}
			}

			if (dtrack == -1 && p_bake_all) {
				new_anim->add_track(anim->track_get_type(j));
				dtrack = new_anim->get_track_count() - 1;
				new_anim->track_set_path(dtrack, anim->track_get_path(j));
				if (anim->track_get_type(j) == Animation::TYPE_POSITION_3D) {
					Vector3 p;
					anim->position_track_interpolate(j, from, &p);
					new_anim->position_track_insert_key(dtrack, 0, p);
					anim->position_track_interpolate(j, to, &p);
					new_anim->position_track_insert_key(dtrack, to - from, p);
				} else if (anim->track_get_type(j) == Animation::TYPE_ROTATION_3D) {
					Quaternion r;
					anim->rotation_track_interpolate(j, from, &r);
					new_anim->rotation_track_insert_key(dtrack, 0, r);
					anim->rotation_track_interpolate(j, to, &r);
					new_anim->rotation_track_insert_key(dtrack, to - from, r);
				} else if (anim->track_get_type(j) == Animation::TYPE_SCALE_3D) {
					Vector3 s;
					anim->scale_track_interpolate(j, from, &s);
					new_anim->scale_track_insert_key(dtrack, 0, s);
					anim->scale_track_interpolate(j, to, &s);
					new_anim->scale_track_insert_key(dtrack, to - from, s);
				} else if (anim->track_get_type(j) == Animation::TYPE_VALUE) {
					Variant var = anim->value_track_interpolate(j, from);
					new_anim->track_insert_key(dtrack, 0, var);
					Variant to_var = anim->value_track_interpolate(j, to);
					new_anim->track_insert_key(dtrack, to - from, to_var);
				} else if (anim->track_get_type(j) == Animation::TYPE_BLEND_SHAPE) {
					float interp;
					anim->blend_shape_track_interpolate(j, from, &interp);
					new_anim->blend_shape_track_insert_key(dtrack, 0, interp);
					anim->blend_shape_track_interpolate(j, to, &interp);
					new_anim->blend_shape_track_insert_key(dtrack, to - from, interp);
				}
			}
		}

		new_anim->set_loop_mode(loop_mode);
		new_anim->set_length(to - from);

		al->add_animation(name, new_anim);

		Ref<Animation> saved_anim = _save_animation_to_file(new_anim, save_to_file, save_to_path, keep_current);
		if (saved_anim != new_anim) {
			al->add_animation(name, saved_anim);
		}
	}

	al->remove_animation(ap->find_animation(anim)); // Remove original animation (no longer needed).
}

void ResourceImporterScene::_optimize_animations(AnimationPlayer *anim, float p_max_vel_error, float p_max_ang_error, int p_prc_error) {
	List<StringName> anim_names;
	anim->get_animation_list(&anim_names);
	for (const StringName &E : anim_names) {
		Ref<Animation> a = anim->get_animation(E);
		a->optimize(p_max_vel_error, p_max_ang_error, p_prc_error);
	}
}

void ResourceImporterScene::_compress_animations(AnimationPlayer *anim, int p_page_size_kb) {
	List<StringName> anim_names;
	anim->get_animation_list(&anim_names);
	for (const StringName &E : anim_names) {
		Ref<Animation> a = anim->get_animation(E);
		a->compress(p_page_size_kb * 1024);
	}
}

void ResourceImporterScene::get_internal_import_options(InternalImportCategory p_category, List<ImportOption> *r_options) const {
	switch (p_category) {
		case INTERNAL_IMPORT_CATEGORY_NODE: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "import/skip_import", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
		} break;
		case INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "import/skip_import", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate/physics", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "generate/navmesh", PROPERTY_HINT_ENUM, "Disabled,Mesh + NavMesh,NavMesh Only"), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "physics/body_type", PROPERTY_HINT_ENUM, "Static,Dynamic,Area"), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "physics/shape_type", PROPERTY_HINT_ENUM, "Decompose Convex,Simple Convex,Trimesh,Box,Sphere,Cylinder,Capsule", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 0));

			// Decomposition
			Mesh::ConvexDecompositionSettings decomposition_default;
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "decomposition/advanced", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/precision", PROPERTY_HINT_RANGE, "1,10,1"), 5));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "decomposition/max_concavity", PROPERTY_HINT_RANGE, "0.0,1.0,0.001", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.max_concavity));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "decomposition/symmetry_planes_clipping_bias", PROPERTY_HINT_RANGE, "0.0,1.0,0.001", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.symmetry_planes_clipping_bias));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "decomposition/revolution_axes_clipping_bias", PROPERTY_HINT_RANGE, "0.0,1.0,0.001", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.revolution_axes_clipping_bias));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "decomposition/min_volume_per_convex_hull", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.min_volume_per_convex_hull));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/resolution", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.resolution));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/max_num_vertices_per_convex_hull", PROPERTY_HINT_RANGE, "5,512,1", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.max_num_vertices_per_convex_hull));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/plane_downsampling", PROPERTY_HINT_RANGE, "1,16,1", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.plane_downsampling));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/convexhull_downsampling", PROPERTY_HINT_RANGE, "1,16,1", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.convexhull_downsampling));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "decomposition/normalize_mesh", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.normalize_mesh));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/mode", PROPERTY_HINT_ENUM, "Voxel,Tetrahedron", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), static_cast<int>(decomposition_default.mode)));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "decomposition/convexhull_approximation", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.convexhull_approximation));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "decomposition/max_convex_hulls", PROPERTY_HINT_RANGE, "1,100,1", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.max_convex_hulls));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "decomposition/project_hull_vertices", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), decomposition_default.project_hull_vertices));

			// Primitives: Box, Sphere, Cylinder, Capsule.
			r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "primitive/size", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), Vector3(2.0, 2.0, 2.0)));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "primitive/height", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 1.0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "primitive/radius", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 1.0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "primitive/position", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), Vector3()));
			r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "primitive/rotation", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), Vector3()));

			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "generate/occluder", PROPERTY_HINT_ENUM, "Disabled,Mesh + Occluder,Occluder Only", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "occluder/simplification_distance", PROPERTY_HINT_RANGE, "0.0,2.0,0.01", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 0.1f));
		} break;
		case INTERNAL_IMPORT_CATEGORY_MESH: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "save_to_file/enabled", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "save_to_file/path", PROPERTY_HINT_SAVE_FILE, "*.res,*.tres"), ""));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "save_to_file/make_streamable"), ""));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "generate/shadow_meshes", PROPERTY_HINT_ENUM, "Default,Enable,Disable"), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "generate/lightmap_uv", PROPERTY_HINT_ENUM, "Default,Enable,Disable"), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "generate/lods", PROPERTY_HINT_ENUM, "Default,Enable,Disable"), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "lods/normal_split_angle", PROPERTY_HINT_RANGE, "0,180,0.1,degrees"), 25.0f));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "lods/normal_merge_angle", PROPERTY_HINT_RANGE, "0,180,0.1,degrees"), 60.0f));
		} break;
		case INTERNAL_IMPORT_CATEGORY_MATERIAL: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "use_external/enabled", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "use_external/path", PROPERTY_HINT_FILE, "*.material,*.res,*.tres"), ""));
		} break;
		case INTERNAL_IMPORT_CATEGORY_ANIMATION: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "settings/loop_mode", PROPERTY_HINT_ENUM, "None,Linear,Pingpong"), 0));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "save_to_file/enabled", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "save_to_file/path", PROPERTY_HINT_SAVE_FILE, "*.res,*.tres"), ""));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "save_to_file/keep_custom_tracks"), ""));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "slices/amount", PROPERTY_HINT_RANGE, "0,256,1", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 0));

			for (int i = 0; i < 256; i++) {
				r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "slice_" + itos(i + 1) + "/name"), ""));
				r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "slice_" + itos(i + 1) + "/start_frame"), 0));
				r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "slice_" + itos(i + 1) + "/end_frame"), 0));
				r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "slice_" + itos(i + 1) + "/loop_mode", PROPERTY_HINT_ENUM, "None,Linear,Pingpong"), 0));
				r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "slice_" + itos(i + 1) + "/save_to_file/enabled", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
				r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "slice_" + itos(i + 1) + "/save_to_file/path", PROPERTY_HINT_SAVE_FILE, ".res,*.tres"), ""));
				r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "slice_" + itos(i + 1) + "/save_to_file/keep_custom_tracks"), false));
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "import/skip_import", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "optimizer/enabled", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), true));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "optimizer/max_velocity_error", PROPERTY_HINT_RANGE, "0,1,0.01"), 0.01));
			r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "optimizer/max_angular_error", PROPERTY_HINT_RANGE, "0,1,0.01"), 0.01));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "optimizer/max_precision_error", PROPERTY_HINT_NONE, "1,6,1"), 3));
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "compression/enabled", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "compression/page_size", PROPERTY_HINT_RANGE, "4,512,1,suffix:kb"), 8));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "import_tracks/position", PROPERTY_HINT_ENUM, "IfPresent,IfPresentForAll,Never"), 1));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "import_tracks/rotation", PROPERTY_HINT_ENUM, "IfPresent,IfPresentForAll,Never"), 1));
			r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "import_tracks/scale", PROPERTY_HINT_ENUM, "IfPresent,IfPresentForAll,Never"), 1));
		} break;
		case INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE: {
			r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "import/skip_import", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
			r_options->push_back(ImportOption(PropertyInfo(Variant::OBJECT, "retarget/bone_map", PROPERTY_HINT_RESOURCE_TYPE, "BoneMap", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), Variant()));
		} break;
		default: {
		}
	}

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		post_importer_plugins.write[i]->get_internal_import_options(EditorScenePostImportPlugin::InternalImportCategory(p_category), r_options);
	}
}

bool ResourceImporterScene::get_internal_option_visibility(InternalImportCategory p_category, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	if (p_options.has("import/skip_import") && p_option != "import/skip_import" && bool(p_options["import/skip_import"])) {
		return false; //if skip import
	}
	switch (p_category) {
		case INTERNAL_IMPORT_CATEGORY_NODE: {
		} break;
		case INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE: {
			const bool generate_physics =
					p_options.has("generate/physics") &&
					p_options["generate/physics"].operator bool();

			if (
					p_option == "physics/body_type" ||
					p_option == "physics/shape_type") {
				// Show if need to generate collisions.
				return generate_physics;
			}

			if (p_option.find("decomposition/") >= 0) {
				// Show if need to generate collisions.
				if (generate_physics &&
						// Show if convex is enabled.
						p_options["physics/shape_type"] == Variant(SHAPE_TYPE_DECOMPOSE_CONVEX)) {
					if (p_option == "decomposition/advanced") {
						return true;
					}

					const bool decomposition_advanced =
							p_options.has("decomposition/advanced") &&
							p_options["decomposition/advanced"].operator bool();

					if (p_option == "decomposition/precision") {
						return !decomposition_advanced;
					} else {
						return decomposition_advanced;
					}
				}

				return false;
			}

			if (p_option == "primitive/position" || p_option == "primitive/rotation") {
				const ShapeType physics_shape = (ShapeType)p_options["physics/shape_type"].operator int();
				return generate_physics &&
						physics_shape >= SHAPE_TYPE_BOX;
			}

			if (p_option == "primitive/size") {
				const ShapeType physics_shape = (ShapeType)p_options["physics/shape_type"].operator int();
				return generate_physics &&
						physics_shape == SHAPE_TYPE_BOX;
			}

			if (p_option == "primitive/radius") {
				const ShapeType physics_shape = (ShapeType)p_options["physics/shape_type"].operator int();
				return generate_physics &&
						(physics_shape == SHAPE_TYPE_SPHERE ||
								physics_shape == SHAPE_TYPE_CYLINDER ||
								physics_shape == SHAPE_TYPE_CAPSULE);
			}

			if (p_option == "primitive/height") {
				const ShapeType physics_shape = (ShapeType)p_options["physics/shape_type"].operator int();
				return generate_physics &&
						(physics_shape == SHAPE_TYPE_CYLINDER ||
								physics_shape == SHAPE_TYPE_CAPSULE);
			}

			if (p_option == "occluder/simplification_distance") {
				// Show only if occluder generation is enabled
				return p_options.has("generate/occluder") && p_options["generate/occluder"].operator signed int() != OCCLUDER_DISABLED;
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_MESH: {
			if (p_option == "save_to_file/path" || p_option == "save_to_file/make_streamable") {
				return p_options["save_to_file/enabled"];
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_MATERIAL: {
			if (p_option == "use_external/path") {
				return p_options["use_external/enabled"];
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_ANIMATION: {
			if (p_option == "save_to_file/path" || p_option == "save_to_file/keep_custom_tracks") {
				return p_options["save_to_file/enabled"];
			}
			if (p_option.begins_with("slice_")) {
				int max_slice = p_options["slices/amount"];
				int slice = p_option.get_slice("_", 1).to_int() - 1;
				if (slice >= max_slice) {
					return false;
				}
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE: {
			if (p_option.begins_with("optimizer/") && p_option != "optimizer/enabled" && !bool(p_options["optimizer/enabled"])) {
				return false;
			}
			if (p_option.begins_with("compression/") && p_option != "compression/enabled" && !bool(p_options["compression/enabled"])) {
				return false;
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE: {
			const bool use_retarget = p_options["retarget/bone_map"].get_validated_object() != nullptr;
			if (p_option != "retarget/bone_map" && p_option.begins_with("retarget/")) {
				return use_retarget;
			}
		} break;
		default: {
		}
	}

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		Variant ret = post_importer_plugins.write[i]->get_internal_option_visibility(EditorScenePostImportPlugin::InternalImportCategory(p_category), animation_importer, p_option, p_options);
		if (ret.get_type() == Variant::BOOL) {
			return ret;
		}
	}

	return true;
}

bool ResourceImporterScene::get_internal_option_update_view_required(InternalImportCategory p_category, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	switch (p_category) {
		case INTERNAL_IMPORT_CATEGORY_NODE: {
		} break;
		case INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE: {
			if (
					p_option == "generate/physics" ||
					p_option == "physics/shape_type" ||
					p_option.find("decomposition/") >= 0 ||
					p_option.find("primitive/") >= 0) {
				return true;
			}
		} break;
		case INTERNAL_IMPORT_CATEGORY_MESH: {
		} break;
		case INTERNAL_IMPORT_CATEGORY_MATERIAL: {
		} break;
		case INTERNAL_IMPORT_CATEGORY_ANIMATION: {
		} break;
		case INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE: {
		} break;
		case INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE: {
		} break;
		default: {
		}
	}

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		Variant ret = post_importer_plugins.write[i]->get_internal_option_update_view_required(EditorScenePostImportPlugin::InternalImportCategory(p_category), p_option, p_options);
		if (ret.get_type() == Variant::BOOL) {
			return ret;
		}
	}

	return false;
}

void ResourceImporterScene::get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset) const {
	r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "nodes/root_type", PROPERTY_HINT_TYPE_STRING, "Node"), "Node3D"));
	r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "nodes/root_name"), "Scene Root"));

	List<String> script_extentions;
	ResourceLoader::get_recognized_extensions_for_type("Script", &script_extentions);

	String script_ext_hint;

	for (const String &E : script_extentions) {
		if (!script_ext_hint.is_empty()) {
			script_ext_hint += ",";
		}
		script_ext_hint += "*." + E;
	}

	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "nodes/apply_root_scale"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "nodes/root_scale", PROPERTY_HINT_RANGE, "0.001,1000,0.001"), 1.0));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "meshes/ensure_tangents"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "meshes/generate_lods"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "meshes/create_shadow_meshes"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "meshes/light_baking", PROPERTY_HINT_ENUM, "Disabled,Static (VoxelGI/SDFGI),Static Lightmaps (VoxelGI/SDFGI/LightmapGI),Dynamic (VoxelGI only)", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 1));
	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "meshes/lightmap_texel_size", PROPERTY_HINT_RANGE, "0.001,100,0.001"), 0.2));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "skins/use_named_skins"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/import"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "animation/fps", PROPERTY_HINT_RANGE, "1,120,1"), 30));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/trimming"), false));
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/remove_immutable_tracks"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "import_script/path", PROPERTY_HINT_FILE, script_ext_hint), ""));

	r_options->push_back(ImportOption(PropertyInfo(Variant::DICTIONARY, "_subresources", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR), Dictionary()));

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		post_importer_plugins.write[i]->get_import_options(p_path, r_options);
	}

	for (Ref<EditorSceneFormatImporter> importer_elem : importers) {
		importer_elem->get_import_options(p_path, r_options);
	}
}

void ResourceImporterScene::_replace_owner(Node *p_node, Node *p_scene, Node *p_new_owner) {
	if (p_node != p_new_owner && p_node->get_owner() == p_scene) {
		p_node->set_owner(p_new_owner);
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *n = p_node->get_child(i);
		_replace_owner(n, p_scene, p_new_owner);
	}
}

Array ResourceImporterScene::_get_skinned_pose_transforms(ImporterMeshInstance3D *p_src_mesh_node) {
	Array skin_pose_transform_array;

	const Ref<Skin> skin = p_src_mesh_node->get_skin();
	if (skin.is_valid()) {
		NodePath skeleton_path = p_src_mesh_node->get_skeleton_path();
		const Node *node = p_src_mesh_node->get_node_or_null(skeleton_path);
		const Skeleton3D *skeleton = Object::cast_to<Skeleton3D>(node);
		if (skeleton) {
			int bind_count = skin->get_bind_count();

			for (int i = 0; i < bind_count; i++) {
				Transform3D bind_pose = skin->get_bind_pose(i);
				String bind_name = skin->get_bind_name(i);

				int bone_idx = bind_name.is_empty() ? skin->get_bind_bone(i) : skeleton->find_bone(bind_name);
				ERR_FAIL_COND_V(bone_idx >= skeleton->get_bone_count(), Array());

				Transform3D bp_global_rest;
				if (bone_idx >= 0) {
					bp_global_rest = skeleton->get_bone_global_pose(bone_idx);
				} else {
					bp_global_rest = skeleton->get_bone_global_pose(i);
				}

				skin_pose_transform_array.push_back(bp_global_rest * bind_pose);
			}
		}
	}

	return skin_pose_transform_array;
}

void ResourceImporterScene::_generate_meshes(Node *p_node, const Dictionary &p_mesh_data, bool p_generate_lods, bool p_create_shadow_meshes, LightBakeMode p_light_bake_mode, float p_lightmap_texel_size, const Vector<uint8_t> &p_src_lightmap_cache, Vector<Vector<uint8_t>> &r_lightmap_caches) {
	ImporterMeshInstance3D *src_mesh_node = Object::cast_to<ImporterMeshInstance3D>(p_node);
	if (src_mesh_node) {
		//is mesh
		MeshInstance3D *mesh_node = memnew(MeshInstance3D);
		mesh_node->set_name(src_mesh_node->get_name());
		mesh_node->set_transform(src_mesh_node->get_transform());
		mesh_node->set_skin(src_mesh_node->get_skin());
		mesh_node->set_skeleton_path(src_mesh_node->get_skeleton_path());
		if (src_mesh_node->get_mesh().is_valid()) {
			Ref<ArrayMesh> mesh;
			if (!src_mesh_node->get_mesh()->has_mesh()) {
				//do mesh processing

				bool generate_lods = p_generate_lods;
				float split_angle = 25.0f;
				float merge_angle = 60.0f;
				bool create_shadow_meshes = p_create_shadow_meshes;
				bool bake_lightmaps = p_light_bake_mode == LIGHT_BAKE_STATIC_LIGHTMAPS;
				String save_to_file;

				String mesh_id = src_mesh_node->get_mesh()->get_meta("import_id", src_mesh_node->get_mesh()->get_name());

				if (!mesh_id.is_empty() && p_mesh_data.has(mesh_id)) {
					Dictionary mesh_settings = p_mesh_data[mesh_id];
					{
						//fill node settings for this node with default values
						List<ImportOption> iopts;
						get_internal_import_options(INTERNAL_IMPORT_CATEGORY_MESH, &iopts);
						for (const ImportOption &E : iopts) {
							if (!mesh_settings.has(E.option.name)) {
								mesh_settings[E.option.name] = E.default_value;
							}
						}
					}

					if (mesh_settings.has("generate/shadow_meshes")) {
						int shadow_meshes = mesh_settings["generate/shadow_meshes"];
						if (shadow_meshes == MESH_OVERRIDE_ENABLE) {
							create_shadow_meshes = true;
						} else if (shadow_meshes == MESH_OVERRIDE_DISABLE) {
							create_shadow_meshes = false;
						}
					}

					if (mesh_settings.has("generate/lightmap_uv")) {
						int lightmap_uv = mesh_settings["generate/lightmap_uv"];
						if (lightmap_uv == MESH_OVERRIDE_ENABLE) {
							bake_lightmaps = true;
						} else if (lightmap_uv == MESH_OVERRIDE_DISABLE) {
							bake_lightmaps = false;
						}
					}

					if (mesh_settings.has("generate/lods")) {
						int lods = mesh_settings["generate/lods"];
						if (lods == MESH_OVERRIDE_ENABLE) {
							generate_lods = true;
						} else if (lods == MESH_OVERRIDE_DISABLE) {
							generate_lods = false;
						}
					}

					if (mesh_settings.has("lods/normal_split_angle")) {
						split_angle = mesh_settings["lods/normal_split_angle"];
					}

					if (mesh_settings.has("lods/normal_merge_angle")) {
						merge_angle = mesh_settings["lods/normal_merge_angle"];
					}

					if (mesh_settings.has("save_to_file/enabled") && bool(mesh_settings["save_to_file/enabled"]) && mesh_settings.has("save_to_file/path")) {
						save_to_file = mesh_settings["save_to_file/path"];
						if (!save_to_file.is_resource_file()) {
							save_to_file = "";
						}
					}

					for (int i = 0; i < post_importer_plugins.size(); i++) {
						post_importer_plugins.write[i]->internal_process(EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MESH, nullptr, src_mesh_node, src_mesh_node->get_mesh(), mesh_settings);
					}
				}

				if (bake_lightmaps) {
					Transform3D xf;
					Node3D *n = src_mesh_node;
					while (n) {
						xf = n->get_transform() * xf;
						n = n->get_parent_node_3d();
					}

					Vector<uint8_t> lightmap_cache;
					src_mesh_node->get_mesh()->lightmap_unwrap_cached(xf, p_lightmap_texel_size, p_src_lightmap_cache, lightmap_cache);

					if (!lightmap_cache.is_empty()) {
						if (r_lightmap_caches.is_empty()) {
							r_lightmap_caches.push_back(lightmap_cache);
						} else {
							String new_md5 = String::md5(lightmap_cache.ptr()); // MD5 is stored at the beginning of the cache data

							for (int i = 0; i < r_lightmap_caches.size(); i++) {
								String md5 = String::md5(r_lightmap_caches[i].ptr());
								if (new_md5 < md5) {
									r_lightmap_caches.insert(i, lightmap_cache);
									break;
								}

								if (new_md5 == md5) {
									break;
								}
							}
						}
					}
				}

				if (generate_lods) {
					Array skin_pose_transform_array = _get_skinned_pose_transforms(src_mesh_node);
					src_mesh_node->get_mesh()->generate_lods(merge_angle, split_angle, skin_pose_transform_array);
				}

				if (create_shadow_meshes) {
					src_mesh_node->get_mesh()->create_shadow_mesh();
				}

				if (!save_to_file.is_empty()) {
					Ref<Mesh> existing = ResourceCache::get_ref(save_to_file);
					if (existing.is_valid()) {
						//if somehow an existing one is useful, create
						existing->reset_state();
					}
					mesh = src_mesh_node->get_mesh()->get_mesh(existing);

					ResourceSaver::save(mesh, save_to_file); //override

					mesh->set_path(save_to_file, true); //takeover existing, if needed

				} else {
					mesh = src_mesh_node->get_mesh()->get_mesh();
				}
			} else {
				mesh = src_mesh_node->get_mesh()->get_mesh();
			}

			if (mesh.is_valid()) {
				mesh_node->set_mesh(mesh);
				for (int i = 0; i < mesh->get_surface_count(); i++) {
					mesh_node->set_surface_override_material(i, src_mesh_node->get_surface_material(i));
				}
			}
		}

		switch (p_light_bake_mode) {
			case LIGHT_BAKE_DISABLED: {
				mesh_node->set_gi_mode(GeometryInstance3D::GI_MODE_DISABLED);
			} break;
			case LIGHT_BAKE_DYNAMIC: {
				mesh_node->set_gi_mode(GeometryInstance3D::GI_MODE_DYNAMIC);
			} break;
			case LIGHT_BAKE_STATIC:
			case LIGHT_BAKE_STATIC_LIGHTMAPS: {
				mesh_node->set_gi_mode(GeometryInstance3D::GI_MODE_STATIC);
			} break;
		}

		p_node->replace_by(mesh_node);
		p_node->set_owner(nullptr);
		memdelete(p_node);
		p_node = mesh_node;
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {
		_generate_meshes(p_node->get_child(i), p_mesh_data, p_generate_lods, p_create_shadow_meshes, p_light_bake_mode, p_lightmap_texel_size, p_src_lightmap_cache, r_lightmap_caches);
	}
}

void ResourceImporterScene::_add_shapes(Node *p_node, const Vector<Ref<Shape3D>> &p_shapes) {
	for (const Ref<Shape3D> &E : p_shapes) {
		CollisionShape3D *cshape = memnew(CollisionShape3D);
		cshape->set_shape(E);
		p_node->add_child(cshape, true);

		cshape->set_owner(p_node->get_owner());
	}
}

void ResourceImporterScene::_optimize_track_usage(AnimationPlayer *p_player, AnimationImportTracks *p_track_actions) {
	List<StringName> anims;
	p_player->get_animation_list(&anims);
	Node *parent = p_player->get_parent();
	ERR_FAIL_COND(parent == nullptr);
	HashMap<NodePath, uint32_t> used_tracks[TRACK_CHANNEL_MAX];
	bool tracks_to_add = false;
	static const Animation::TrackType track_types[TRACK_CHANNEL_MAX] = { Animation::TYPE_POSITION_3D, Animation::TYPE_ROTATION_3D, Animation::TYPE_SCALE_3D, Animation::TYPE_BLEND_SHAPE };
	for (const StringName &I : anims) {
		Ref<Animation> anim = p_player->get_animation(I);
		for (int i = 0; i < anim->get_track_count(); i++) {
			for (int j = 0; j < TRACK_CHANNEL_MAX; j++) {
				if (anim->track_get_type(i) != track_types[j]) {
					continue;
				}
				switch (p_track_actions[j]) {
					case ANIMATION_IMPORT_TRACKS_IF_PRESENT: {
						// Do Nothing.
					} break;
					case ANIMATION_IMPORT_TRACKS_IF_PRESENT_FOR_ALL: {
						used_tracks[j].insert(anim->track_get_path(i), 0);
						tracks_to_add = true;
					} break;
					case ANIMATION_IMPORT_TRACKS_NEVER: {
						anim->remove_track(i);
						i--;
					} break;
				}
			}
		}
	}

	if (!tracks_to_add) {
		return;
	}

	uint32_t pass = 0;
	for (const StringName &I : anims) {
		Ref<Animation> anim = p_player->get_animation(I);
		for (int j = 0; j < TRACK_CHANNEL_MAX; j++) {
			if (p_track_actions[j] != ANIMATION_IMPORT_TRACKS_IF_PRESENT_FOR_ALL) {
				continue;
			}

			pass++;

			for (int i = 0; i < anim->get_track_count(); i++) {
				if (anim->track_get_type(i) != track_types[j]) {
					continue;
				}

				NodePath path = anim->track_get_path(i);

				ERR_CONTINUE(!used_tracks[j].has(path)); // Should never happen.

				used_tracks[j][path] = pass;
			}

			for (const KeyValue<NodePath, uint32_t> &J : used_tracks[j]) {
				if (J.value == pass) {
					continue;
				}

				NodePath path = J.key;
				Node *n = parent->get_node(path);

				if (j == TRACK_CHANNEL_BLEND_SHAPE) {
					MeshInstance3D *mi = Object::cast_to<MeshInstance3D>(n);
					if (mi && path.get_subname_count() > 0) {
						StringName bs = path.get_subname(0);
						bool valid;
						float value = mi->get(bs, &valid);
						if (valid) {
							int track_idx = anim->add_track(track_types[j]);
							anim->track_set_path(track_idx, path);
							anim->track_set_imported(track_idx, true);
							anim->blend_shape_track_insert_key(track_idx, 0, value);
						}
					}

				} else {
					Skeleton3D *skel = Object::cast_to<Skeleton3D>(n);
					Node3D *n3d = Object::cast_to<Node3D>(n);
					Vector3 loc;
					Quaternion rot;
					Vector3 scale;
					if (skel && path.get_subname_count() > 0) {
						StringName bone = path.get_subname(0);
						int bone_idx = skel->find_bone(bone);
						if (bone_idx == -1) {
							continue;
						}
						// Note that this is using get_bone_pose to update the bone pose cache.
						_ALLOW_DISCARD_ skel->get_bone_pose(bone_idx);
						loc = skel->get_bone_pose_position(bone_idx);
						rot = skel->get_bone_pose_rotation(bone_idx);
						scale = skel->get_bone_pose_scale(bone_idx);
					} else if (n3d) {
						loc = n3d->get_position();
						rot = n3d->get_transform().basis.get_rotation_quaternion();
						scale = n3d->get_scale();
					} else {
						continue;
					}

					// Ensure insertion keeps tracks together and ordered by type (loc/rot/scale)
					int insert_at_pos = -1;
					for (int k = 0; k < anim->get_track_count(); k++) {
						NodePath tpath = anim->track_get_path(k);

						if (path == tpath) {
							Animation::TrackType ttype = anim->track_get_type(k);
							if (insert_at_pos == -1) {
								// First insert, determine whether replacing or kicking back
								if (track_types[j] < ttype) {
									insert_at_pos = k;
									break; // No point in continuing.
								} else {
									insert_at_pos = k + 1;
								}
							} else if (ttype < track_types[j]) {
								// Kick back.
								insert_at_pos = k + 1;
							}
						} else if (insert_at_pos >= 0) {
							break;
						}
					}
					int track_idx = anim->add_track(track_types[j], insert_at_pos);

					anim->track_set_path(track_idx, path);
					anim->track_set_imported(track_idx, true);
					switch (j) {
						case TRACK_CHANNEL_POSITION: {
							anim->position_track_insert_key(track_idx, 0, loc);
						} break;
						case TRACK_CHANNEL_ROTATION: {
							anim->rotation_track_insert_key(track_idx, 0, rot);
						} break;
						case TRACK_CHANNEL_SCALE: {
							anim->scale_track_insert_key(track_idx, 0, scale);
						} break;
						default: {
						}
					}
				}
			}
		}
	}
}

Node *ResourceImporterScene::pre_import(const String &p_source_file, const HashMap<StringName, Variant> &p_options) {
	Ref<EditorSceneFormatImporter> importer;
	String ext = p_source_file.get_extension().to_lower();

	// TRANSLATORS: This is an editor progress label.
	EditorProgress progress("pre-import", TTR("Pre-Import Scene"), 0);
	progress.step(TTR("Importing Scene..."), 0);

	for (Ref<EditorSceneFormatImporter> importer_elem : importers) {
		List<String> extensions;
		importer_elem->get_extensions(&extensions);

		for (const String &F : extensions) {
			if (F.to_lower() == ext) {
				importer = importer_elem;
				break;
			}
		}

		if (importer.is_valid()) {
			break;
		}
	}

	ERR_FAIL_COND_V(!importer.is_valid(), nullptr);

	Error err = OK;
	HashMap<StringName, Variant> options_dupe = p_options;

	Node *scene = importer->import_scene(p_source_file, EditorSceneFormatImporter::IMPORT_ANIMATION | EditorSceneFormatImporter::IMPORT_GENERATE_TANGENT_ARRAYS, options_dupe, nullptr, &err);
	if (!scene || err != OK) {
		return nullptr;
	}

	HashMap<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> collision_map;
	List<Pair<NodePath, Node *>> node_renames;
	_pre_fix_node(scene, scene, collision_map, nullptr, node_renames);

	return scene;
}

Error ResourceImporterScene::import(const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
	const String &src_path = p_source_file;

	Ref<EditorSceneFormatImporter> importer;
	String ext = src_path.get_extension().to_lower();

	EditorProgress progress("import", TTR("Import Scene"), 104);
	progress.step(TTR("Importing Scene..."), 0);

	for (Ref<EditorSceneFormatImporter> importer_elem : importers) {
		List<String> extensions;
		importer_elem->get_extensions(&extensions);

		for (const String &F : extensions) {
			if (F.to_lower() == ext) {
				importer = importer_elem;
				break;
			}
		}

		if (importer.is_valid()) {
			break;
		}
	}

	ERR_FAIL_COND_V(!importer.is_valid(), ERR_FILE_UNRECOGNIZED);

	int import_flags = 0;

	if (animation_importer) {
		import_flags |= EditorSceneFormatImporter::IMPORT_ANIMATION;
		import_flags |= EditorSceneFormatImporter::IMPORT_DISCARD_MESHES_AND_MATERIALS;
	} else {
		if (bool(p_options["animation/import"])) {
			import_flags |= EditorSceneFormatImporter::IMPORT_ANIMATION;
		}
	}

	if (bool(p_options["skins/use_named_skins"])) {
		import_flags |= EditorSceneFormatImporter::IMPORT_USE_NAMED_SKIN_BINDS;
	}

	bool ensure_tangents = p_options["meshes/ensure_tangents"];
	if (ensure_tangents) {
		import_flags |= EditorSceneFormatImporter::IMPORT_GENERATE_TANGENT_ARRAYS;
	}

	Error err = OK;
	List<String> missing_deps; // for now, not much will be done with this
	Node *scene = importer->import_scene(src_path, import_flags, p_options, &missing_deps, &err);
	if (!scene || err != OK) {
		return err;
	}

	bool apply_root = true;
	if (p_options.has("nodes/apply_root_scale")) {
		apply_root = p_options["nodes/apply_root_scale"];
	}
	real_t root_scale = 1;
	if (p_options.has("nodes/root_scale")) {
		root_scale = p_options["nodes/root_scale"];
	}
	if (Object::cast_to<Node3D>(scene)) {
		Node3D *scene_3d = Object::cast_to<Node3D>(scene);
		Vector3 scale = Vector3(root_scale, root_scale, root_scale);
		if (apply_root) {
			_apply_permanent_scale_to_descendants(scene, scale);
		} else {
			scene_3d->scale(scale);
		}
	}
	Dictionary subresources = p_options["_subresources"];

	Dictionary node_data;
	if (subresources.has("nodes")) {
		node_data = subresources["nodes"];
	}

	Dictionary material_data;
	if (subresources.has("materials")) {
		material_data = subresources["materials"];
	}

	Dictionary animation_data;
	if (subresources.has("animations")) {
		animation_data = subresources["animations"];
	}

	HashSet<Ref<ImporterMesh>> scanned_meshes;
	HashMap<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> collision_map;
	Pair<PackedVector3Array, PackedInt32Array> occluder_arrays;
	List<Pair<NodePath, Node *>> node_renames;

	_pre_fix_node(scene, scene, collision_map, &occluder_arrays, node_renames);

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		post_importer_plugins.write[i]->pre_process(scene, p_options);
	}

	float fps = 30;
	if (p_options.has(SNAME("animation/fps"))) {
		fps = (float)p_options[SNAME("animation/fps")];
	}
	_pre_fix_animations(scene, scene, node_data, animation_data, fps);
	_post_fix_node(scene, scene, collision_map, occluder_arrays, scanned_meshes, node_data, material_data, animation_data, fps, apply_root ? root_scale : 1.0);
	_post_fix_animations(scene, scene, node_data, animation_data, fps);

	String root_type = p_options["nodes/root_type"];
	root_type = root_type.split(" ")[0]; // full root_type is "ClassName (filename.gd)" for a script global class.

	Ref<Script> root_script = nullptr;
	if (ScriptServer::is_global_class(root_type)) {
		root_script = ResourceLoader::load(ScriptServer::get_global_class_path(root_type));
		root_type = ScriptServer::get_global_class_base(root_type);
	}

	if (root_type != "Node3D") {
		Node *base_node = Object::cast_to<Node>(ClassDB::instantiate(root_type));

		if (base_node) {
			scene->replace_by(base_node);
			scene->set_owner(nullptr);
			memdelete(scene);
			scene = base_node;
		}
	}

	if (root_script.is_valid()) {
		scene->set_script(Variant(root_script));
	}

	if (p_options["nodes/root_name"] != "Scene Root") {
		scene->set_name(p_options["nodes/root_name"]);
	} else {
		scene->set_name(p_save_path.get_file().get_basename());
	}

	if (!occluder_arrays.first.is_empty() && !occluder_arrays.second.is_empty()) {
		Ref<ArrayOccluder3D> occ = memnew(ArrayOccluder3D);
		occ->set_arrays(occluder_arrays.first, occluder_arrays.second);
		OccluderInstance3D *occluder_instance = memnew(OccluderInstance3D);
		occluder_instance->set_occluder(occ);
		scene->add_child(occluder_instance, true);
		occluder_instance->set_owner(scene);
	}

	bool gen_lods = bool(p_options["meshes/generate_lods"]);
	bool create_shadow_meshes = bool(p_options["meshes/create_shadow_meshes"]);
	int light_bake_mode = p_options["meshes/light_baking"];
	float texel_size = p_options["meshes/lightmap_texel_size"];
	float lightmap_texel_size = MAX(0.001, texel_size);

	Vector<uint8_t> src_lightmap_cache;
	Vector<Vector<uint8_t>> mesh_lightmap_caches;

	{
		src_lightmap_cache = FileAccess::get_file_as_bytes(p_source_file + ".unwrap_cache", &err);
		if (err != OK) {
			src_lightmap_cache.clear();
		}
	}

	Dictionary mesh_data;
	if (subresources.has("meshes")) {
		mesh_data = subresources["meshes"];
	}
	_generate_meshes(scene, mesh_data, gen_lods, create_shadow_meshes, LightBakeMode(light_bake_mode), lightmap_texel_size, src_lightmap_cache, mesh_lightmap_caches);

	if (mesh_lightmap_caches.size()) {
		Ref<FileAccess> f = FileAccess::open(p_source_file + ".unwrap_cache", FileAccess::WRITE);
		if (f.is_valid()) {
			f->store_32(mesh_lightmap_caches.size());
			for (int i = 0; i < mesh_lightmap_caches.size(); i++) {
				String md5 = String::md5(mesh_lightmap_caches[i].ptr());
				f->store_buffer(mesh_lightmap_caches[i].ptr(), mesh_lightmap_caches[i].size());
			}
		}
	}
	err = OK;

	progress.step(TTR("Running Custom Script..."), 2);

	String post_import_script_path = p_options["import_script/path"];
	Ref<EditorScenePostImport> post_import_script;

	if (!post_import_script_path.is_empty()) {
		Ref<Script> scr = ResourceLoader::load(post_import_script_path);
		if (!scr.is_valid()) {
			EditorNode::add_io_error(TTR("Couldn't load post-import script:") + " " + post_import_script_path);
		} else {
			post_import_script = Ref<EditorScenePostImport>(memnew(EditorScenePostImport));
			post_import_script->set_script(scr);
			if (!post_import_script->get_script_instance()) {
				EditorNode::add_io_error(TTR("Invalid/broken script for post-import (check console):") + " " + post_import_script_path);
				post_import_script.unref();
				return ERR_CANT_CREATE;
			}
		}
	}

	if (post_import_script.is_valid()) {
		post_import_script->init(p_source_file);
		scene = post_import_script->post_import(scene);
		if (!scene) {
			EditorNode::add_io_error(
					TTR("Error running post-import script:") + " " + post_import_script_path + "\n" +
					TTR("Did you return a Node-derived object in the `_post_import()` method?"));
			return err;
		}
	}

	for (int i = 0; i < post_importer_plugins.size(); i++) {
		post_importer_plugins.write[i]->post_process(scene, p_options);
	}

	progress.step(TTR("Saving..."), 104);

	if (animation_importer) {
		Ref<AnimationLibrary> library;
		for (int i = 0; i < scene->get_child_count(); i++) {
			AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(scene->get_child(i));
			if (ap) {
				List<StringName> libs;
				ap->get_animation_library_list(&libs);
				if (libs.size()) {
					library = ap->get_animation_library(libs.front()->get());
					break;
				}
			}
		}

		if (!library.is_valid()) {
			library.instantiate(); // Will be empty
		}

		print_verbose("Saving animation to: " + p_save_path + ".scn");
		err = ResourceSaver::save(library, p_save_path + ".res"); //do not take over, let the changed files reload themselves
		ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save animation to file '" + p_save_path + ".res'.");

	} else {
		Ref<PackedScene> packer = memnew(PackedScene);
		packer->pack(scene);
		print_verbose("Saving scene to: " + p_save_path + ".scn");
		err = ResourceSaver::save(packer, p_save_path + ".scn"); //do not take over, let the changed files reload themselves
		ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save scene to file '" + p_save_path + ".scn'.");
	}

	memdelete(scene);

	//this is not the time to reimport, wait until import process is done, import file is saved, etc.
	//EditorNode::get_singleton()->reload_scene(p_source_file);

	return OK;
}

ResourceImporterScene *ResourceImporterScene::scene_singleton = nullptr;
ResourceImporterScene *ResourceImporterScene::animation_singleton = nullptr;

Vector<Ref<EditorSceneFormatImporter>> ResourceImporterScene::importers;
Vector<Ref<EditorScenePostImportPlugin>> ResourceImporterScene::post_importer_plugins;

bool ResourceImporterScene::ResourceImporterScene::has_advanced_options() const {
	return true;
}
void ResourceImporterScene::ResourceImporterScene::show_advanced_options(const String &p_path) {
	SceneImportSettings::get_singleton()->open_settings(p_path, animation_importer);
}

ResourceImporterScene::ResourceImporterScene(bool p_animation_import) {
	if (p_animation_import) {
		animation_singleton = this;
	} else {
		scene_singleton = this;
	}
	animation_importer = p_animation_import;
}

void ResourceImporterScene::add_importer(Ref<EditorSceneFormatImporter> p_importer, bool p_first_priority) {
	ERR_FAIL_COND(p_importer.is_null());
	if (p_first_priority) {
		importers.insert(0, p_importer);
	} else {
		importers.push_back(p_importer);
	}
}

void ResourceImporterScene::remove_post_importer_plugin(const Ref<EditorScenePostImportPlugin> &p_plugin) {
	post_importer_plugins.erase(p_plugin);
}

void ResourceImporterScene::add_post_importer_plugin(const Ref<EditorScenePostImportPlugin> &p_plugin, bool p_first_priority) {
	ERR_FAIL_COND(p_plugin.is_null());
	if (p_first_priority) {
		post_importer_plugins.insert(0, p_plugin);
	} else {
		post_importer_plugins.push_back(p_plugin);
	}
}

void ResourceImporterScene::remove_importer(Ref<EditorSceneFormatImporter> p_importer) {
	importers.erase(p_importer);
}

void ResourceImporterScene::clean_up_importer_plugins() {
	importers.clear();
	post_importer_plugins.clear();
}

///////////////////////////////////////

uint32_t EditorSceneFormatImporterESCN::get_import_flags() const {
	return IMPORT_SCENE;
}

void EditorSceneFormatImporterESCN::get_extensions(List<String> *r_extensions) const {
	r_extensions->push_back("escn");
}

Node *EditorSceneFormatImporterESCN::import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err) {
	Error error;
	Ref<PackedScene> ps = ResourceFormatLoaderText::singleton->load(p_path, p_path, &error);
	ERR_FAIL_COND_V_MSG(!ps.is_valid(), nullptr, "Cannot load scene as text resource from path '" + p_path + "'.");
	Node *scene = ps->instantiate();
	TypedArray<Node> nodes = scene->find_children("*", "MeshInstance3D");
	for (int32_t node_i = 0; node_i < nodes.size(); node_i++) {
		MeshInstance3D *mesh_3d = cast_to<MeshInstance3D>(nodes[node_i]);
		Ref<ImporterMesh> mesh;
		mesh.instantiate();
		// Ignore the aabb, it will be recomputed.
		ImporterMeshInstance3D *importer_mesh_3d = memnew(ImporterMeshInstance3D);
		importer_mesh_3d->set_name(mesh_3d->get_name());
		importer_mesh_3d->set_transform(mesh_3d->get_relative_transform(mesh_3d->get_parent()));
		importer_mesh_3d->set_skin(mesh_3d->get_skin());
		importer_mesh_3d->set_skeleton_path(mesh_3d->get_skeleton_path());
		Ref<ArrayMesh> array_mesh_3d_mesh = mesh_3d->get_mesh();
		if (array_mesh_3d_mesh.is_valid()) {
			// For the MeshInstance3D nodes, we need to convert the ArrayMesh to an ImporterMesh specially.
			mesh->set_name(array_mesh_3d_mesh->get_name());
			for (int32_t blend_i = 0; blend_i < array_mesh_3d_mesh->get_blend_shape_count(); blend_i++) {
				mesh->add_blend_shape(array_mesh_3d_mesh->get_blend_shape_name(blend_i));
			}
			for (int32_t surface_i = 0; surface_i < array_mesh_3d_mesh->get_surface_count(); surface_i++) {
				mesh->add_surface(array_mesh_3d_mesh->surface_get_primitive_type(surface_i),
						array_mesh_3d_mesh->surface_get_arrays(surface_i),
						array_mesh_3d_mesh->surface_get_blend_shape_arrays(surface_i),
						array_mesh_3d_mesh->surface_get_lods(surface_i),
						array_mesh_3d_mesh->surface_get_material(surface_i),
						array_mesh_3d_mesh->surface_get_name(surface_i),
						array_mesh_3d_mesh->surface_get_format(surface_i));
			}
			mesh->set_blend_shape_mode(array_mesh_3d_mesh->get_blend_shape_mode());
			importer_mesh_3d->set_mesh(mesh);
			mesh_3d->replace_by(importer_mesh_3d);
			continue;
		}
		Ref<Mesh> mesh_3d_mesh = mesh_3d->get_mesh();
		if (mesh_3d_mesh.is_valid()) {
			// For the MeshInstance3D nodes, we need to convert the Mesh to an ImporterMesh specially.
			mesh->set_name(mesh_3d_mesh->get_name());
			for (int32_t surface_i = 0; surface_i < mesh_3d_mesh->get_surface_count(); surface_i++) {
				mesh->add_surface(mesh_3d_mesh->surface_get_primitive_type(surface_i),
						mesh_3d_mesh->surface_get_arrays(surface_i),
						Array(),
						mesh_3d_mesh->surface_get_lods(surface_i),
						mesh_3d_mesh->surface_get_material(surface_i),
						mesh_3d_mesh->surface_get_material(surface_i).is_valid() ? mesh_3d_mesh->surface_get_material(surface_i)->get_name() : String(),
						mesh_3d_mesh->surface_get_format(surface_i));
			}
			importer_mesh_3d->set_mesh(mesh);
			mesh_3d->replace_by(importer_mesh_3d);
			continue;
		}
	}

	ERR_FAIL_COND_V(!scene, nullptr);

	return scene;
}