Limit universal camera beta

I’m experimenting with cameras. I’m trying to make a free camera but with fixed rotation on beta. The arcrotate camera has properties to limit the beta but the universalcamera does not. So i used this code to force the camera position and rotation:

scene.beforeRender = function() {
  camera.position.y = 100;
  camera.rotation.x = 120;

but this is called every time the scene is rendered.
Is there a better way ?

Nope this is perfect

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