public void Set(Matrix4 Matrix4)
 {
     m11 = Matrix4.m11; m12 = Matrix4.m12; m13 = Matrix4.m13;
     m21 = Matrix4.m21; m22 = Matrix4.m22; m23 = Matrix4.m23;
     m31 = Matrix4.m31; m32 = Matrix4.m32; m33 = Matrix4.m33;
 }