How can I roll a sphere relative to the camera's Y axis but not X axis?

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Hello, I've recently started using Unity, and have been using C# as my scripting language of preference. Just as the question says, I'm trying to roll a rigid body sphere in relation to the Y axis of the camera but not the X axis. I have searched both questions and the forums but have been unable to figure this out. The code I'm currently using works well going forward and backward, but unless the camera's X rotation is exactly 0.0f, it causes the sphere to roll offset by the X rotation of the camera. Here is a listing of my current code:

 void FixedUpdate () {
    if (Input.GetKey ("w"))
       rigidbody.AddTorque(Camera.main.transform.right * speed * Time.deltaTime);
    if (Input.GetKey ("a"))
       rigidbody.AddTorque(Camera.main.transform.forward * speed * Time.deltaTime);
    if (Input.GetKey ("s"))
       rigidbody.AddTorque(Camera.main.transform.right * -speed * Time.deltaTime);
    if (Input.GetKey ("d"))
       rigidbody.AddTorque(Camera.main.transform.forward * -speed * Time.deltaTime);
 }

I'm sure there's a fairly easy fix for this, but I've been bashing my head on it for a couple hours so I figured I would ask. Thank you in advance!

Answer 1

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Answer by whydoidoit · Mar 05, 2014 at 04:30 PM

You want to do this:

   var directionToMove = Quaternion.AngleAxis(Camera.main.transform.eulerAngles.y, Vector3.up) * Vector3.forward;

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RandyMcMillen · Mar 05, 2014 at 04:57 PM 0

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Thank you very much. That works perfectly! I would vote you up, but unfortunately I have no rep yet, but it is exactly what I needed. Thank you so much!

scumola · Jul 25, 2019 at 09:54 PM 0

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Yup this did it for me. $$anonymous$$y situation, I had a camera moving around a lunar lander and I wanted the torque for different roll/pitch/yaw to be relative to the camera/user's view. Adding this did the trick. $$anonymous$$y code:

 if (Input.Get$$anonymous$$ey($$anonymous$$eyCode.A)) // left
 {
     m_Rigidbody.AddTorque(Quaternion.AngleAxis(Camera.main.transform.eulerAngles.y, Vector3.up) * new Vector3(0, 0, 5000 * Time.deltaTime));
 }
 if (Input.Get$$anonymous$$ey($$anonymous$$eyCode.D)) // right
 {
     m_Rigidbody.AddTorque(Quaternion.AngleAxis(Camera.main.transform.eulerAngles.y, Vector3.up) * new Vector3(0, 0, -5000 * Time.deltaTime));
 }

How can I roll a sphere relative to the camera's Y axis but not X axis?

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