public static Matrix4x4 CreateFromRotation(Matrix3x3 rotationMatrix)
{
Matrix4x4 m = Matrix4x4.Identity;
m.V00 = rotationMatrix.V00;
m.V01 = rotationMatrix.V01;
m.V02 = rotationMatrix.V02;
m.V10 = rotationMatrix.V10;
m.V11 = rotationMatrix.V11;
m.V12 = rotationMatrix.V12;
m.V20 = rotationMatrix.V20;
m.V21 = rotationMatrix.V21;
m.V22 = rotationMatrix.V22;
return m;
}