"Lock" Rotation of camera within interval

Question

I am using THREE.js for a VR game and I would like to lock the rotation of the camera on the y-axis between two angles. I don't want the user to see behind them but instead look left and right. I'm not sure how the coordinate system works for the camera, but here is a picture of what I want.

I'm using threeVR which does not have max and min settings so I'm resorting to manually locking my camera's rotation in the update function of my program, but I don't know how.

Answer 1

Can you not just lock the angle with a min/max in the update loop?

camera.rotation.y = Math.max(startAngle, Math.min(endAngle, camera.rotation.y));