public static void RotateVertices(List <Vertex> vertexList, Matrix3d R)
        {
            List <Vector3d> listVectors = Vertices.ConvertToVector3dList(vertexList);

            MatrixUtilsOpenTK.RotateVectors(listVectors, R);
            Vertices.AssignNewVectorList(vertexList, listVectors);
        }