Unity3D RigidBody.AddTorque(), RigidBody.AddRelativeTorque rotates the opposite of the expected direction

Physics
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1

It’s simple, the torque makes the object rotate in the opposite direction.
I’ve searched through the web, and couldn’t find the answer, as most people apply torque using float.

Here’s the problem. A cube with a rigidbody, no gravity, is in the scene. I added the following simple code.

void Start()
    {
        gameObject.GetComponent<Rigidbody>().AddTorque(Vector3.up*5);
    }

I thought, considering the right-hand rule, the cube would rotate counter-clockwise, looking from the above. However, it rotates clockwise, looked from the above. The same problem occurs using “AddRelativeTorque” as well.

I asked chatGPT and the suggested reason was

  • coordinate is upside down, which I don’t think so since I did not touch anything with the world coordinate, and linear force works as expected.
  • the asset has reversed coordination, which also is not true since it’s just a vanilla cube.
  • unexpected behavior with the engine is my guess. Either a bug, or something unity-specific that I didn’t know.

Thank you in advance, and I’m sorry if this is a duplicate.

2

Unity uses left handed coordinates.