Rotating a plane so that its top is parallel to the camera viewport

Question

I have this code, which creates the plane in front of the camera and rotates the plane to face the camera.

 _viewPlane = Instantiate(dialogView2, viewcamera.transform.position + viewcamera.transform.forward, Quaternion.identity) as GameObject;

 var dir = viewcamera.transform.position - _viewPlane.transform.position;

 _viewPlane.transform.rotation = Quaternion.FromToRotation(Vector3.up, dir);
   
 _dialogViewPlane.transform.rotation.SetLookRotation(dir);

However, the plane is askew such that the top of the plane is not parallel to the viewport.

I've tried a number of different solutions, some of which if I iterated here would REALLY show off my ineptitude on this, but suffice it to say I haven't had any luck. Can anyone help?

Answer 1

Answer by robertbu · Jul 26, 2013 at 09:14 PM

The easiest solution to this problem is to create a vertical plane using the Unity Wiki CreatePlane Script. Then all you have to do is set the two rotations equal:

 _viewPlane.transform.rotation = viewcamera.transform.rotation;

if you want to continue to use the built-in plane, you will have to compensate for the default rotation of the plane. Something like:

 _viewPlane.transform.rotation = viewcamera.transform.rotation  * Quaternion.Euler(90, 180, 0);

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Rotating a plane so that its top is parallel to the camera viewport

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