Merge pull request #2430 from Hugo-Pereira/fix_assimp_export_consistency
[FBX Export] fixed ordering of skin indices and weights, to be consistent between systemspull/2435/head^2
commit
4a6b9d716a
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@ -1575,11 +1575,22 @@ void FBXExporter::WriteObjects ()
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// one sticky point is that the number of vertices may not match,
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// because assimp splits vertices by normal, uv, etc.
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// functor for aiNode sorting
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struct SortNodeByName
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{
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bool operator()(const aiNode *lhs, const aiNode *rhs) const
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{
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return strcmp(lhs->mName.C_Str(), rhs->mName.C_Str()) < 0;
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}
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};
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// first we should mark the skeleton for each mesh.
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// the skeleton must include not only the aiBones,
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// but also all their parent nodes.
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// anything that affects the position of any bone node must be included.
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std::vector<std::set<const aiNode*>> skeleton_by_mesh(mScene->mNumMeshes);
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// Use SorNodeByName to make sure the exported result will be the same across all systems
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// Otherwise the aiNodes of the skeleton would be sorted based on the pointer address, which isn't consistent
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std::vector<std::set<const aiNode*, SortNodeByName>> skeleton_by_mesh(mScene->mNumMeshes);
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// at the same time we can build a list of all the skeleton nodes,
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// which will be used later to mark them as type "limbNode".
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std::unordered_set<const aiNode*> limbnodes;
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@ -1587,7 +1598,7 @@ void FBXExporter::WriteObjects ()
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std::map<std::string,aiNode*> node_by_bone;
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for (size_t mi = 0; mi < mScene->mNumMeshes; ++mi) {
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const aiMesh* m = mScene->mMeshes[mi];
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std::set<const aiNode*> skeleton;
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std::set<const aiNode*, SortNodeByName> skeleton;
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for (size_t bi =0; bi < m->mNumBones; ++bi) {
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const aiBone* b = m->mBones[bi];
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const std::string name(b->mName.C_Str());
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@ -1728,7 +1739,7 @@ void FBXExporter::WriteObjects ()
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aiMatrix4x4 mesh_xform = get_world_transform(mesh_node, mScene);
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// now make a subdeformer for each bone in the skeleton
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const std::set<const aiNode*> &skeleton = skeleton_by_mesh[mi];
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const std::set<const aiNode*, SortNodeByName> skeleton= skeleton_by_mesh[mi];
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for (const aiNode* bone_node : skeleton) {
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// if there's a bone for this node, find it
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const aiBone* b = nullptr;
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