public SampleData(Matrix matrix, string description, string matrixText = null)
            {
                Matrix      = matrix;
                Description = description;

                if (string.IsNullOrEmpty(matrixText))
                {
                    MatrixText = Ab3d.Utilities.Dumper.GetMatrix3DText(matrix.ToWpfMatrix3D());
                }
                else
                {
                    MatrixText = matrixText;
                }
            }