Hello,
i use this Function from the Engine Source: (Original Name is “ClickedOnConvertToStaticMesh”)
UStaticMesh* ACube::CreateStaticMeshFromProcMesh(TArray<UQuad*> &ProcMeshComponent)
{
//UStaticMesh = UStaticMesh::create
// Find first selected ProcMeshComp
FString ActorName = FString(TEXT("Me"));
FString LevelName = FString(TEXT("VoxelWorld"));
FString AssetName = FString(TEXT("SM_")) + LevelName + FString(TEXT("_") + ActorName);
FString PathName = FString(TEXT("/Game/Meshes/"));
FString PackageName = PathName + AssetName;
// Raw mesh data we are filling in
FRawMesh RawMesh;
// Materials to apply to new mesh
TArray<UMaterialInterface*> MeshMaterials;
const int32 NumSections = 6;
int32 VertexBase = 0;
for (int32 SectionIdx = 0; SectionIdx < NumSections; SectionIdx++)
{
FProcMeshSection* ProcSection = ProcMeshComponent[SectionIdx]->GetProcMeshSection(0);
// Copy verts
for (FProcMeshVertex& Vert : ProcSection->ProcVertexBuffer)
{
RawMesh.VertexPositions.Add(Vert.Position);
}
// Copy 'wedge' info
int32 NumIndices = ProcSection->ProcIndexBuffer.Num();
for (int32 IndexIdx = 0; IndexIdx < NumIndices; IndexIdx++)
{
int32 Index = ProcSection->ProcIndexBuffer[IndexIdx];
RawMesh.WedgeIndices.Add(Index + VertexBase);
FProcMeshVertex& ProcVertex = ProcSection->ProcVertexBuffer[Index];
FVector TangentX = ProcVertex.Tangent.TangentX;
FVector TangentZ = ProcVertex.Normal;
FVector TangentY = (TangentX ^ TangentZ).GetSafeNormal() * (ProcVertex.Tangent.bFlipTangentY ? -1.f : 1.f);
RawMesh.WedgeTangentX.Add(TangentX);
RawMesh.WedgeTangentY.Add(TangentY);
RawMesh.WedgeTangentZ.Add(TangentZ);
RawMesh.WedgeTexCoords[0].Add(ProcVertex.UV0);
RawMesh.WedgeColors.Add(ProcVertex.Color);
}
// copy face info
int32 NumTris = NumIndices / 3;
for (int32 TriIdx = 0; TriIdx < NumTris; TriIdx++)
{
RawMesh.FaceMaterialIndices.Add(SectionIdx);
RawMesh.FaceSmoothingMasks.Add(0); // Assume this is ignored as bRecomputeNormals is false
}
// Remember material
MeshMaterials.Add(ProcMeshComponent[SectionIdx]->GetMaterial(0));
// Update offset for creating one big index/vertex buffer
VertexBase += ProcSection->ProcVertexBuffer.Num();
}
// If we got some valid data.
if (RawMesh.VertexPositions.Num() > 3 && RawMesh.WedgeIndices.Num() > 3)
{
// Then find/create it.
UPackage* Package = CreatePackage(NULL, *PackageName);
check(Package);
// Create StaticMesh object if Asset File is needed change "this" to Package
UStaticMesh* StaticMesh = NewObject<UStaticMesh>(Package, FName(*AssetName), RF_Public | RF_Standalone);
StaticMesh->InitResources();
StaticMesh->LightingGuid = FGuid::NewGuid();
// Add source to new StaticMesh
FStaticMeshSourceModel* SrcModel = new (StaticMesh->SourceModels) FStaticMeshSourceModel();
SrcModel->BuildSettings.bRecomputeNormals = false;
SrcModel->BuildSettings.bRecomputeTangents = false;
SrcModel->BuildSettings.bRemoveDegenerates = false;
SrcModel->BuildSettings.bUseHighPrecisionTangentBasis = false;
SrcModel->BuildSettings.bUseFullPrecisionUVs = false;
SrcModel->BuildSettings.bGenerateLightmapUVs = true;
SrcModel->BuildSettings.SrcLightmapIndex = 0;
SrcModel->BuildSettings.DstLightmapIndex = 1;
SrcModel->RawMeshBulkData->SaveRawMesh(RawMesh);
// Copy materials to new mesh
for (UMaterialInterface* Material : MeshMaterials)
{
StaticMesh->StaticMaterials.Add(FStaticMaterial(Material));
}
//Set the Imported version before calling the build
StaticMesh->ImportVersion = EImportStaticMeshVersion::LastVersion;
// Build mesh from source
StaticMesh->Build(false);
StaticMesh->PostEditChange();
// Notify asset registry of new asset
FAssetRegistryModule::AssetCreated(StaticMesh);
return StaticMesh;
}
else
return nullptr;
}
I edited some Parts. It works greate, the StaticMesh is saved and is useable as an Asset.
The big Problem is that the returned StaticMesh is not useable. e.g. in a StaticMeshComponent.
testMeshComponent->SetStaticMesh(StaticMesh);
It keeps crashing the Editor. I thought it may not return a invalid Pointer. But everything is fine.
