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add a method to get section materials for skeletal meshes

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#jira UE-169489
#rb tyson.brochu

[CL 35901867 by jimmy andrews in ue5-main branch]
This commit is contained in:
jimmy andrews
2024-08-29 14:33:43 -04:00
parent 1b11b91258
commit e3fc9f5e8c
2 changed files with 101 additions and 1 deletions
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Engine/Plugins/Runtime/GeometryScripting/Source/GeometryScriptingCore/Private/MeshAssetFunctions.cpp
+80
View File
@@ -536,6 +536,86 @@ void UGeometryScriptLibrary_StaticMeshFunctions::GetSectionMaterialListFromStati
#endif
}
void UGeometryScriptLibrary_StaticMeshFunctions::GetLODMaterialListFromSkeletalMesh(
USkeletalMesh* FromSkeletalMeshAsset,
FGeometryScriptMeshReadLOD RequestedLOD,
TArray<UMaterialInterface*>& MaterialList,
TArray<int32>& MaterialIndex,
TArray<FName>& MaterialSlotNames,
EGeometryScriptOutcomePins& Outcome,
UGeometryScriptDebug* Debug)
{
Outcome = EGeometryScriptOutcomePins::Failure;
if (FromSkeletalMeshAsset == nullptr)
{
UE::Geometry::AppendError(Debug, EGeometryScriptErrorType::InvalidInputs, LOCTEXT("GetLODMaterialListFromSkeletalMesh_InvalidInput1", "GetLODMaterialListFromSkeletalMesh: FromSkeletalMeshAsset is Null"));
return;
}
#if WITH_EDITOR
if (RequestedLOD.LODType == EGeometryScriptLODType::HiResSourceModel)
{
UE::Geometry::AppendError(Debug, EGeometryScriptErrorType::InvalidInputs, LOCTEXT("GetLODMaterialListFromSkeletalMesh_LODNotAvailable", "GetLODMaterialListFromSkeletalMesh: Requested LOD is not available"));
return;
}
int32 UseLODIndex = FMath::Clamp(RequestedLOD.LODIndex, 0, FromSkeletalMeshAsset->GetLODNum() - 1);
const TArray<FSkeletalMaterial>& Mats = FromSkeletalMeshAsset->GetMaterials();
const int32 NumMats = Mats.Num();
// Get the material mapping via the LODInfo struct
const FSkeletalMeshLODInfo* LODInfo = FromSkeletalMeshAsset->GetLODInfo(UseLODIndex);
if (LODInfo && !LODInfo->LODMaterialMap.IsEmpty())
{
const TArray<int32>& Map = LODInfo->LODMaterialMap;
const int32 NumSectionMat = Map.Num();
MaterialList.Reset(NumSectionMat);
MaterialIndex.Reset(NumSectionMat);
MaterialSlotNames.Reset(NumSectionMat);
for (int32 Idx = 0; Idx < NumSectionMat; ++Idx)
{
int32 MatIdx = Map[Idx];
if (MatIdx == INDEX_NONE) // by convention, INDEX_NONE means the index is mapped to itself
{
MatIdx = FMath::Min(Idx, NumMats - 1);
}
MaterialIndex.Add(MatIdx);
if (Mats.IsValidIndex(MatIdx))
{
MaterialList.Add(Mats[MatIdx].MaterialInterface);
MaterialSlotNames.Add(Mats[MatIdx].MaterialSlotName);
}
else
{
MaterialList.Add(nullptr);
MaterialSlotNames.Add(FName());
}
}
}
// if the LODMaterialMap is not there or is empty, materials are identity-mapped
else
{
MaterialList.Reset(NumMats);
MaterialIndex.Reset(NumMats);
MaterialSlotNames.Reset(NumMats);
for (int32 Idx = 0; Idx < NumMats; ++Idx)
{
MaterialIndex.Add(Idx);
MaterialList.Add(Mats[Idx].MaterialInterface);
MaterialSlotNames.Add(Mats[Idx].MaterialSlotName);
}
}
Outcome = EGeometryScriptOutcomePins::Success;
#else
UE::Geometry::AppendError(Debug, EGeometryScriptErrorType::InvalidInputs, LOCTEXT("GetLODMaterialListFromSkeletalMesh_EditorOnly", "GetLODMaterialListFromSkeletalMesh: Not available at Runtime"));
#endif
}
namespace UELocal
{
Engine/Plugins/Runtime/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshAssetFunctions.h
+21 -1
View File
@@ -245,7 +245,27 @@ public:
UGeometryScriptDebug* Debug = nullptr);
/**
* Get the asset materials from the static mesh asset. These will match the DynamicMesh material if CopyMeshToStaticMesh
* Extracts the Material List and corresponding Material Indices from the specified LOD of the Skeletal Mesh Asset.
* If Copy Mesh To Skeletal Mesh was used to create a Dynamic Mesh, then the returned Material List can be passed directly to a Dynamic Mesh Component.
*
* @param MaterialIndex this returned array is the same size as MaterialList, with each value the index of that Material in the Skeletal Mesh's Material List
* @param MateriaSlotNames this returned array is the same size as MaterialList, with each value the Slot Name of that Material in the Skeletal Mesh's Material List
*
* Note that the LOD Index in RequestedLOD will be silently clamped to the available number of LODs
*/
UFUNCTION(BlueprintCallable, Category = "GeometryScript|SkeletalMesh", meta = (DisplayName = "Get LOD Material List From Skeletal Mesh", ExpandEnumAsExecs = "Outcome"))
static void
GetLODMaterialListFromSkeletalMesh(
USkeletalMesh* FromSkeletalMeshAsset,
FGeometryScriptMeshReadLOD RequestedLOD,
TArray<UMaterialInterface*>& MaterialList,
TArray<int32>& MaterialIndex,
TArray<FName>& MaterialSlotNames,
EGeometryScriptOutcomePins& Outcome,
UGeometryScriptDebug* Debug = nullptr);
/**
* Get the asset materials from the static mesh asset. These will match the DynamicMesh material if CopyMeshFromStaticMesh
* was used to create a DynamicMesh with bUseSectionMaterials=false
*/
UFUNCTION(BlueprintCallable, Category = "GeometryScript|StaticMesh")