How to restrict rotation properly

Questions & Answers
1

How do I restrict rotation angles? The rotation just keeps slipping through the limit and stopping forever. When I set 355 as a limit, it stops at 354.993 or something. Can something be done about it? Is the problem with Update frequency?

I am using this code:

if(Input.GetAxis("Mouse X")<0)
{	
	if ((transform.rotation.eulerAngles.y < 4) || (transform.rotation.eulerAngles.y > 355))
	{
		transform.RotateAround(cameraFocus.position, Vector3(0, -1, 0), 5 * Time.deltaTime);
		print(transform.rotation.eulerAngles.y);
	}
}

//right
if(Input.GetAxis("Mouse X")>0)
{
	if ((transform.rotation.eulerAngles.y < 4) || (transform.rotation.eulerAngles.y > 355))
	{
		transform.RotateAround(cameraFocus.position, Vector3.up, 5 * Time.deltaTime);
		print(transform.rotation.eulerAngles.y);
	}
}

I need this for synching cursor movement with camera rotation, obviously.

Please, help.

2

Not clear what this code is trying to do. It looks like you’re trying to limit the camera rotation to +/- 5 degrees, which seems a bit small.

Personally, I’d insert a dummy GameObject which sits at the cameraFocus position, with the camera parented to that. Then you just set the dummy’s transform.rotation.eulerAngles, rather than doing a RotateAround which will gradually accumulate floating point error. You can then easily clamp the Y rotation to exactly what you want.

3

You can use Quaternion.RotateTowards(Quaternion from, Quaternion to, float maxDegreesDelta) function to restrict rotation:

Quaternion ClampRotationXByLookDirection(Quaternion curentRotation)
{
    Vector3 lookDirectionX = Vector3.ProjectOnPlane(lookDirection, Vector3.right).normalized;
    Quaternion lookRotation = Quaternion.LookRotation(lookDirectionX);
    Quaternion towardsRotation= Quaternion.RotateTowards(lookRotation, curentRotation, lookDeltaX);
    return towardsRotation;
}

Quaternion ClampRotationYByLookDirection(Quaternion curentRotation)
{
    Vector3 lookDirectionY = Vector3.ProjectOnPlane(lookDirection, Vector3.up).normalized;
    Quaternion lookRotation = Quaternion.LookRotation(lookDirectionY);
    Quaternion towardsRotation= Quaternion.RotateTowards(lookRotation, curentRotation, lookDeltaY);
    return towardsRotation;
}