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02-Note/DAWA/2024.12.31新项目笔记.md
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@ -31,9 +31,82 @@
# FaceSet
https://groups.google.com/g/alembic-discussion/c/hICfVMzRV2U?pli=1
https://github.com/zenustech/zeno/blob/b4ed8740810f20cf0612d615d9505468b2d2a4d1/projects/FBX/FBXSDK.cpp#L477
FbxSelectionSet Class
https://help.autodesk.com/view/FBX/2015/ENU/?guid=__cpp_ref_class_fbx_selection_set_html
```c++
int mat_count = 0;
if (pMesh->GetElementMaterialCount() > 0) {
for (auto i = 0; i < numPolygons; ++i) {
faceset[i] = pMesh->GetElementMaterial()->GetIndexArray().GetAt(i);
}
mat_count = pNode->GetMaterialCount();
for (auto i = 0; i < mat_count; i++) {
FbxSurfaceMaterial* material = pNode->GetMaterial(i);
ud.set2(format("faceset_{}", i), material->GetName());
}
}
```
GetPolygonGroup?
UE中相关逻辑位于FbxMesh.cpp
```c++
void ExtractMeshMaterials(FFbxParser& Parser, FbxMesh* Mesh, FbxNode* MeshNode, TFunction<void(const FString& MaterialName, const FString& MaterialUid, const int32 MeshMaterialIndex)> CollectMaterial)
{
if (!Mesh || !MeshNode)
{
return;
}
//Grab all Material indexes use by the mesh
TArray<int32> MaterialIndexes;
int32 PolygonCount = Mesh->GetPolygonCount();
if (FbxGeometryElementMaterial* GeometryElementMaterial = Mesh->GetElementMaterial())
{
FbxLayerElementArrayTemplate<int32>& IndexArray = GeometryElementMaterial->GetIndexArray();
switch (GeometryElementMaterial->GetMappingMode())
{
case FbxGeometryElement::eByPolygon:
{
if (IndexArray.GetCount() == PolygonCount)
{
for (int32 PolygonIndex = 0; PolygonIndex < PolygonCount; ++PolygonIndex)
{
MaterialIndexes.AddUnique(IndexArray.GetAt(PolygonIndex));
}
}
}
break;
case FbxGeometryElement::eAllSame:
{
if (IndexArray.GetCount() > 0)
{
MaterialIndexes.AddUnique(IndexArray.GetAt(0));
}
}
break;
}
}
const int32 MaterialCount = MeshNode->GetMaterialCount();
TMap<FbxSurfaceMaterial*, int32> UniqueSlotNames;
UniqueSlotNames.Reserve(MaterialCount);
bool bAddAllNodeMaterials = (MaterialIndexes.Num() == 0);
for (int32 MaterialIndex = 0; MaterialIndex < MaterialCount; ++MaterialIndex)
{
if (FbxSurfaceMaterial* FbxMaterial = MeshNode->GetMaterial(MaterialIndex))
{
int32& SlotMaterialCount = UniqueSlotNames.FindOrAdd(FbxMaterial);
FString MaterialName = Parser.GetFbxHelper()->GetFbxObjectName(FbxMaterial);
FString MaterialUid = TEXT("\\Material\\") + MaterialName;
if (bAddAllNodeMaterials || MaterialIndexes.Contains(MaterialIndex))
{
if (SlotMaterialCount > 0)
{
MaterialName += TEXT("_Section") + FString::FromInt(SlotMaterialCount);
}
SlotMaterialCount++;
CollectMaterial(MaterialName, MaterialUid, MaterialIndex);
}
}
}
}
```