Zoom isn't "finished" onmouseup.

[sikanrong]

There are times when you zoom the camera, and when you take your fingers off the touchpad and then try to pan, the camera will keep zooming.

Almost as if the camera hadn't yet reached it's final zoom destination, and when you take your fingers off the touchpad it stops that animation for some reason. Then when you resume other camera actions it's like it resumes the animation towards the (very zoomed in) destination point.

[vincentpotato]

I had this issue as well but resolved it by adding controls.update() in the animate function. This is what OrbitControls require for the dampening to work correctly. Now it works like a charm!