private void LoadMtrlHelper(IntPtr mtrlResourceHandle)
{
if (mtrlResourceHandle == IntPtr.Zero)
{
return;
}
var mtrl = ( MtrlResource * )mtrlResourceHandle;
var mtrlPath = Utf8String.FromSpanUnsafe(mtrl->Handle.FileNameSpan(), true, null, true);
_mtrlCollection = PathCollections.TryGetValue(mtrlPath, out var c) ? c : null;
}