limiting object rotation

[Philippe]

Hi,

Is there a method enabling to limit the range of rotation of a tracking device (Euler) relatively to the orientation of another tracking device (in my case, I have a gun which orientation's follows the glove position, and I would like to limit the orientation of the gun so that it cannot point backwards but only forwards - i.e. limiting the yaw of the gun to a range from -90 degrees to +90 degrees relatively to the current direction of the HMD).

Is there a simple way to do this?
In order words, I would like not to enable the gun to point backwards (this is some workaround solution: due to some tracking issues, it happens that the gun suddenly "flips back" and stays pointing backwards even when the glove stays more or less in the north direction ; I would like to have the glove never identified as pointing south).

Thanks,
Philippe.