GeometryCollection::MakeMeshElement ( const TArray< TV3_PTS >& PointsIn, const TArray< TV3_NORM >& NormalsI..., const TArray< TV_INT3 >& Triangles..., const TArray< TV2 >& UVsIn, const FTransform& Xf, const FTransform& GeoXf, const int NumberOfMaterials )