bool FDerivedDataPhysXCooker::BuildTriMesh( TArray<uint8>& OutData, bool bInMirrored, bool InUseAllTriData )
{
check(Cooker != NULL);
bool bResult = false;
FTriMeshCollisionData TriangleMeshDesc;
IInterface_CollisionDataProvider* CDP = Cast<IInterface_CollisionDataProvider>(CollisionDataProvider);
check(CDP != NULL); // It's all been checked before getting into this function
bool bHaveTriMeshData = CDP->GetPhysicsTriMeshData(&TriangleMeshDesc, InUseAllTriData);
if(bHaveTriMeshData)
{
// If any of the below checks gets hit this usually means
// IInterface_CollisionDataProvider::ContainsPhysicsTriMeshData did not work properly.
const int32 NumIndices = TriangleMeshDesc.Indices.Num();
const int32 NumVerts = TriangleMeshDesc.Vertices.Num();
if(NumIndices == 0 || NumVerts == 0 || TriangleMeshDesc.MaterialIndices.Num() > NumIndices)
{
UE_LOG(LogPhysics, Warning, TEXT("FDerivedDataPhysXCooker::BuildTriMesh: Triangle data from '%s' invalid (%d verts, %d indices)."), *CollisionDataProvider->GetPathName(), NumVerts, NumIndices );
return bResult;
}
TArray<FVector>* MeshVertices = NULL;
TArray<FVector> MirroredVerts;
if( bInMirrored )
{
MirroredVerts.AddUninitialized(NumVerts);
for(int32 VertIdx=0; VertIdx<NumVerts; VertIdx++)
{
MirroredVerts[VertIdx] = TriangleMeshDesc.Vertices[VertIdx] * FVector(-1,1,1);
}
MeshVertices = &MirroredVerts;
}
else
{
MeshVertices = &TriangleMeshDesc.Vertices;
}
UE_LOG(LogPhysics, Log, TEXT("Cook TriMesh: %s (FlipX: %d)"), *CollisionDataProvider->GetPathName(), bInMirrored);
bool bPerPolySkeletalMesh = false;
if (USkeletalMesh* SkeletalMesh = Cast<USkeletalMesh>(CollisionDataProvider))
{
ensure(SkeletalMesh->bEnablePerPolyCollision);
bPerPolySkeletalMesh = true;
}
bResult = Cooker->CookTriMesh( Format, *MeshVertices, TriangleMeshDesc.Indices, TriangleMeshDesc.MaterialIndices, bInMirrored ? !TriangleMeshDesc.bFlipNormals : TriangleMeshDesc.bFlipNormals, OutData, bPerPolySkeletalMesh );
if( !bResult )
{
UE_LOG(LogPhysics, Warning, TEXT("Failed to cook TriMesh: %s (FlipX:%d)."), *CollisionDataProvider->GetPathName(), bInMirrored );
}
}
return bResult;
}
int32 FDerivedDataPhysXCooker::BuildTriMesh( TArray<uint8>& OutData, bool InUseAllTriData )
{
check(Cooker != NULL);
bool bResult = false;
FTriMeshCollisionData TriangleMeshDesc;
IInterface_CollisionDataProvider* CDP = Cast<IInterface_CollisionDataProvider>(CollisionDataProvider);
check(CDP != NULL); // It's all been checked before getting into this function
bool bHaveTriMeshData = CDP->GetPhysicsTriMeshData(&TriangleMeshDesc, InUseAllTriData);
if(bHaveTriMeshData)
{
// If any of the below checks gets hit this usually means
// IInterface_CollisionDataProvider::ContainsPhysicsTriMeshData did not work properly.
const int32 NumIndices = TriangleMeshDesc.Indices.Num();
const int32 NumVerts = TriangleMeshDesc.Vertices.Num();
if(NumIndices == 0 || NumVerts == 0 || TriangleMeshDesc.MaterialIndices.Num() > NumIndices)
{
UE_LOG(LogPhysics, Warning, TEXT("FDerivedDataPhysXCooker::BuildTriMesh: Triangle data from '%s' invalid (%d verts, %d indices)."), *CollisionDataProvider->GetPathName(), NumVerts, NumIndices );
return bResult;
}
TArray<FVector>* MeshVertices = NULL;
MeshVertices = &TriangleMeshDesc.Vertices;
UE_LOG(LogPhysics, Log, TEXT("Cook TriMesh: %s"), *CollisionDataProvider->GetPathName());
bool bDeformableMesh = CollisionDataProvider->IsA(USplineMeshComponent::StaticClass());
if (USkeletalMesh* SkeletalMesh = Cast<USkeletalMesh>(CollisionDataProvider))
{
ensure(SkeletalMesh->bEnablePerPolyCollision);
bDeformableMesh = true;
}
bResult = Cooker->CookTriMesh( Format, RuntimeCookFlags, *MeshVertices, TriangleMeshDesc.Indices, TriangleMeshDesc.MaterialIndices, TriangleMeshDesc.bFlipNormals, OutData, bDeformableMesh );
if( !bResult )
{
UE_LOG(LogPhysics, Warning, TEXT("Failed to cook TriMesh: %s."), *CollisionDataProvider->GetPathName());
}
}
return bResult == true ? 1 : 0; //the cooker only generates 1 or 0 trimeshes. We return an int because we support multiple trimeshes for welding and we might want to do this per static mesh in the future.
}