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Fix crash when importing a surface with no UVs after another surface in the same OBJ file that had UVs

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This commit is contained in:
clayjohn 2024-09-20 19:22:37 -07:00
parent 621cadcf65
commit 07546006e8
1 changed files with 29 additions and 23 deletions
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52
editor/import/3d/resource_importer_obj.cpp
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@ -246,6 +246,8 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
bool smoothing = true;
const uint32_t no_smoothing_smooth_group = (uint32_t)-1;
bool uses_uvs = false;
while (true) {
String l = f->get_line().strip_edges();
while (l.length() && l[l.length() - 1] == '\\') {
@ -320,26 +322,7 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
idx = 1 ^ idx;
}
if (face[idx].size() == 3) {
int norm = face[idx][2].to_int() - 1;
if (norm < 0) {
norm += normals.size() + 1;
}
ERR_FAIL_INDEX_V(norm, normals.size(), ERR_FILE_CORRUPT);
surf_tool->set_normal(normals[norm]);
if (generate_tangents && uvs.is_empty()) {
// We can't generate tangents without UVs, so create dummy tangents.
Vector3 tan = Vector3(normals[norm].z, -normals[norm].x, normals[norm].y).cross(normals[norm].normalized()).normalized();
surf_tool->set_tangent(Plane(tan.x, tan.y, tan.z, 1.0));
}
} else {
// No normals, use a dummy tangent since normals and tangents will be generated.
if (generate_tangents && uvs.is_empty()) {
// We can't generate tangents without UVs, so create dummy tangents.
surf_tool->set_tangent(Plane(1.0, 0.0, 0.0, 1.0));
}
}
// Check UVs before faces as we may need to generate dummy tangents if there are no UVs.
if (face[idx].size() >= 2 && !face[idx][1].is_empty()) {
int uv = face[idx][1].to_int() - 1;
if (uv < 0) {
@ -347,6 +330,27 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
}
ERR_FAIL_INDEX_V(uv, uvs.size(), ERR_FILE_CORRUPT);
surf_tool->set_uv(uvs[uv]);
uses_uvs = true;
}
if (face[idx].size() == 3) {
int norm = face[idx][2].to_int() - 1;
if (norm < 0) {
norm += normals.size() + 1;
}
ERR_FAIL_INDEX_V(norm, normals.size(), ERR_FILE_CORRUPT);
surf_tool->set_normal(normals[norm]);
if (generate_tangents && !uses_uvs) {
// We can't generate tangents without UVs, so create dummy tangents.
Vector3 tan = Vector3(normals[norm].z, -normals[norm].x, normals[norm].y).cross(normals[norm].normalized()).normalized();
surf_tool->set_tangent(Plane(tan.x, tan.y, tan.z, 1.0));
}
} else {
// No normals, use a dummy tangent since normals and tangents will be generated.
if (generate_tangents && !uses_uvs) {
// We can't generate tangents without UVs, so create dummy tangents.
surf_tool->set_tangent(Plane(1.0, 0.0, 0.0, 1.0));
}
}
int vtx = face[idx][0].to_int() - 1;
@ -407,7 +411,7 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
surf_tool->generate_normals();
}
if (generate_tangents && uvs.size()) {
if (generate_tangents && uses_uvs) {
surf_tool->generate_tangents();
}
@ -426,10 +430,11 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
Array array = surf_tool->commit_to_arrays();
if (mesh_flags & RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES && generate_tangents) {
// Compression is enabled, so let's validate that the normals and tangents are correct.
if (mesh_flags & RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES && generate_tangents && uses_uvs) {
// Compression is enabled, so let's validate that the normals and generated tangents are correct.
Vector<Vector3> norms = array[Mesh::ARRAY_NORMAL];
Vector<float> tangents = array[Mesh::ARRAY_TANGENT];
ERR_FAIL_COND_V(tangents.is_empty(), ERR_FILE_CORRUPT);
for (int vert = 0; vert < norms.size(); vert++) {
Vector3 tan = Vector3(tangents[vert * 4 + 0], tangents[vert * 4 + 1], tangents[vert * 4 + 2]);
if (abs(tan.dot(norms[vert])) > 0.0001) {
@ -454,6 +459,7 @@ static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes,
surf_tool->clear();
surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
uses_uvs = false;
}
if (l.begins_with("o ") || f->eof_reached()) {