TrackballControls don't work in webgl_multiple_elements_text

can anyone tell me why can’t I use TrackballControls for this example: When I try to switch to TrackballControls, they simply do not respond. I am really new to ThreeJS. Any help would be appreciated. Thanks!

Are you calling TrackballControls.update() when rendering a view? Without this call, the controls won’t work.

That was the problem. Thanks for the quick response!