protected FaceIndicesGroup DereferenceFaceTriplets(FaceTripletGroup faces, FaceTriplets triplets)
{
List<int> indices = new List<int>();
foreach (var f in faces.Triplets)
{
indices.Add(triplets.GetTripletIndex(f));
}
return new FaceIndicesGroup { MaterialId = faces.MaterialId, FaceIndices = indices.ToArray() };
}
