That's about a point! Converting a local point to global position.
I want to change facing direction(-z) to direction of a vector on global space (ex Vector3(-1, 0, 0))
I know assigning global_transform.basis.z = -Vector3(-1, 0, 0) could be helpful, but what about other basis axis (x and y)? If I change the z axis basis manually and without rotation function, other axis does not change and some type of deformation on object occured.