Is it possible to set ArcRotateCamera to change fov (or something else) by pinch instead of radius?
As far as I know, there is no built-in way to switch from using a pinch to change the radius to changing the fov but you could possibly either create a custom control that inherits from BaseCameraPointersInput and changes the fov inside of the onMultiTouch override. You could also just take the ArcRotateCameraPointerInput object used by the camera and explicitly modify the onMultiTouch function to instead change the fov.
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