How to restrict rotation properly

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);

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);

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

Please, help.

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asked Jan 02 '12 at 03:06 AM

krides gravatar image

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1 answer: sort voted first

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.

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answered Jan 02 '12 at 03:37 AM

Winterblood gravatar image

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How do I add those eulerAngles then? What code would you use for that?

Jan 02 '12 at 09:43 AM krides

Pretty much what you've got, except you want the rotation script to be on the dummy pivot object instead of the camera. Try this (may have typos, I write in C# usually):

var maxRot = 45;
var angle = transform.rotation.eulerAngles.y;
angle += Input.GetAxis("Mouse X");
if (angle > maxRot)
    angle = maxRot;
else if (angle < -maxRot)
    angle = -maxRot;
transform.rotation.eulerAngles = new Vector3( 0, angle, 0 );

NB. You have to set the entire Vector3 - you can't modify transform.rotation.eulerAngles.y on it's own.

Jan 02 '12 at 05:05 PM Winterblood
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asked: Jan 02 '12 at 03:06 AM

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Last Updated: Jan 02 '12 at 05:05 PM