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Fix export fbx: Wrong Materials in LayerElementMaterial if a node contains multi meshes (#6103)

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* fix export fbx wrong Materials index in LayerElementMaterial

* Refix export fbx wrong Materials index in LayerElementMaterial. Materials index should be the order of Materials in connections of the Model node.

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Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>
This commit is contained in:
sSsA01
2025-06-05 16:05:36 +09:00
committed by GitHub
parent b3a47a68fa
commit a98ffe6c6f
1 changed files with 6 additions and 7 deletions
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13
code/AssetLib/FBX/FBXExporter.cpp
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@@ -1329,14 +1329,13 @@ void FBXExporter::WriteObjects () {
} else {
mat.AddChild("MappingInformationType", "ByPolygon");
mat.AddChild("ReferenceInformationType", "IndexToDirect");
std::vector<int32_t> mat_indices(polygon_data.size());
uint32_t curr_offset = 0;
for (uint32_t mi = 0; mi < node->mNumMeshes; mi++) {
uint32_t num_faces = mScene->mMeshes[node->mMeshes[mi]]->mNumFaces;
for (uint32_t fi = 0; fi < num_faces; fi++) {
mat_indices[curr_offset + fi] = mi;
std::vector<int32_t> mat_indices;
for (uint32_t n_mi = 0; n_mi < node->mNumMeshes; n_mi++) {
const auto mi = node->mMeshes[n_mi];
const auto *const m = mScene->mMeshes[mi];
for (size_t fi = 0; fi < m->mNumFaces; fi++) {
mat_indices.push_back(n_mi);
}
curr_offset += num_faces;
}
mat.AddChild("Materials", mat_indices);
}