return(new VertexPositionNormalTangent(tuple.Pos, tuple.Nrm, tuple.Tgt));
return(new VertexGeometryDelta(tuple.Pos, tuple.Nrm, Vector3.Zero));
return(new VertexPositionNormal(tuple.Pos, tuple.Nrm));
return(new VertexPositionNormalTangent(tuple.Pos, tuple.Nrm, tuple.Tgt));
return(new VertexGeometryDelta(tuple.Pos, tuple.Nrm, Vector3.Zero));
return(new VertexPositionNormal(tuple.Pos, tuple.Nrm));