virtualx-engine/modules/fbx/fbx_parser/FBXDeformer.cpp

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/*  FBXDeformer.cpp                                                      */
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/*
Open Asset Import Library (assimp)
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/** @file  FBXNoteAttribute.cpp
 *  @brief Assimp::FBX::NodeAttribute (and subclasses) implementation
 */

#include "FBXDocument.h"
#include "FBXDocumentUtil.h"
#include "FBXMeshGeometry.h"
#include "FBXParser.h"
#include "core/math/math_funcs.h"
#include "core/math/transform_3d.h"

#include <iostream>

namespace FBXDocParser {

using namespace Util;

// ------------------------------------------------------------------------------------------------
Deformer::Deformer(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Object(id, element, name) {
}

// ------------------------------------------------------------------------------------------------
Deformer::~Deformer() {
}

Constraint::Constraint(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Object(id, element, name) {
}

Constraint::~Constraint() {
}

// ------------------------------------------------------------------------------------------------
Cluster::Cluster(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Deformer(id, element, doc, name), valid_transformAssociateModel(false) {
	const ScopePtr sc = GetRequiredScope(element);
	//    for( auto element : sc.Elements())
	//    {
	//        std::cout << "cluster element: " << element.first << std::endl;
	//    }
	//
	//    element: Indexes
	//    element: Transform
	//    element: TransformAssociateModel
	//    element: TransformLink
	//    element: UserData
	//    element: Version
	//    element: Weights

	const ElementPtr Indexes = sc->GetElement("Indexes");
	const ElementPtr Weights = sc->GetElement("Weights");

	const ElementPtr TransformAssociateModel = sc->GetElement("TransformAssociateModel");
	if (TransformAssociateModel != nullptr) {
		//Transform t = ReadMatrix(*TransformAssociateModel);
		link_mode = SkinLinkMode_Additive;
		valid_transformAssociateModel = true;
	} else {
		link_mode = SkinLinkMode_Normalized;
		valid_transformAssociateModel = false;
	}

	const ElementPtr Transform = GetRequiredElement(sc, "Transform", element);
	const ElementPtr TransformLink = GetRequiredElement(sc, "TransformLink", element);

	// todo: check if we need this
	//const Element& TransformAssociateModel = GetRequiredElement(sc, "TransformAssociateModel", &element);

	transform = ReadMatrix(Transform);
	transformLink = ReadMatrix(TransformLink);

	// it is actually possible that there be Deformer's with no weights
	if (!!Indexes != !!Weights) {
		DOMError("either Indexes or Weights are missing from Cluster", element);
	}

	if (Indexes) {
		ParseVectorDataArray(indices, Indexes);
		ParseVectorDataArray(weights, Weights);
	}

	if (indices.size() != weights.size()) {
		DOMError("sizes of index and weight array don't match up", element);
	}

	// read assigned node
	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "Model");
	for (const Connection *con : conns) {
		const Model *mod = ProcessSimpleConnection<Model>(*con, false, "Model -> Cluster", element);
		if (mod) {
			node = mod;
			break;
		}
	}

	if (!node) {
		DOMError("failed to read target Node for Cluster", element);
		node = nullptr;
	}
}

// ------------------------------------------------------------------------------------------------
Cluster::~Cluster() {
}

// ------------------------------------------------------------------------------------------------
Skin::Skin(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Deformer(id, element, doc, name), accuracy(0.0f) {
	const ScopePtr sc = GetRequiredScope(element);

	// keep this it is used for debugging and any FBX format changes
	// for (auto element : sc.Elements()) {
	// 	std::cout << "skin element: " << element.first << std::endl;
	// }

	const ElementPtr Link_DeformAcuracy = sc->GetElement("Link_DeformAcuracy");
	if (Link_DeformAcuracy) {
		accuracy = ParseTokenAsFloat(GetRequiredToken(Link_DeformAcuracy, 0));
	}

	const ElementPtr SkinType = sc->GetElement("SkinningType");

	if (SkinType) {
		std::string skin_type = ParseTokenAsString(GetRequiredToken(SkinType, 0));

		if (skin_type == "Linear") {
			skinType = Skin_Linear;
		} else if (skin_type == "Rigid") {
			skinType = Skin_Rigid;
		} else if (skin_type == "DualQuaternion") {
			skinType = Skin_DualQuaternion;
		} else if (skin_type == "Blend") {
			skinType = Skin_Blend;
		} else {
			print_error("[doc:skin] could not find valid skin type: " + String(skin_type.c_str()));
		}
	}

	// resolve assigned clusters
	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "Deformer");

	//

	clusters.reserve(conns.size());
	for (const Connection *con : conns) {
		const Cluster *cluster = ProcessSimpleConnection<Cluster>(*con, false, "Cluster -> Skin", element);
		if (cluster) {
			clusters.push_back(cluster);
			continue;
		}
	}
}

// ------------------------------------------------------------------------------------------------
Skin::~Skin() {
}
// ------------------------------------------------------------------------------------------------
BlendShape::BlendShape(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Deformer(id, element, doc, name) {
	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "Deformer");
	blendShapeChannels.reserve(conns.size());
	for (const Connection *con : conns) {
		const BlendShapeChannel *bspc = ProcessSimpleConnection<BlendShapeChannel>(*con, false, "BlendShapeChannel -> BlendShape", element);
		if (bspc) {
			blendShapeChannels.push_back(bspc);
			continue;
		}
	}
}
// ------------------------------------------------------------------------------------------------
BlendShape::~BlendShape() {
}
// ------------------------------------------------------------------------------------------------
BlendShapeChannel::BlendShapeChannel(uint64_t id, const ElementPtr element, const Document &doc, const std::string &name) :
		Deformer(id, element, doc, name) {
	const ScopePtr sc = GetRequiredScope(element);
	const ElementPtr DeformPercent = sc->GetElement("DeformPercent");
	if (DeformPercent) {
		percent = ParseTokenAsFloat(GetRequiredToken(DeformPercent, 0));
	}
	const ElementPtr FullWeights = sc->GetElement("FullWeights");
	if (FullWeights) {
		ParseVectorDataArray(fullWeights, FullWeights);
	}
	const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "Geometry");
	shapeGeometries.reserve(conns.size());
	for (const Connection *con : conns) {
		const ShapeGeometry *const sg = ProcessSimpleConnection<ShapeGeometry>(*con, false, "Shape -> BlendShapeChannel", element);
		if (sg) {
			shapeGeometries.push_back(sg);
			continue;
		}
	}
}
// ------------------------------------------------------------------------------------------------
BlendShapeChannel::~BlendShapeChannel() {
}
// ------------------------------------------------------------------------------------------------
} // namespace FBXDocParser