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  1. This was very easy to adapt from what @davrous mentioned. I suggest to implement a physically connected touch interface so that each physical connection gets a screen mapped point in 3D space from picked coordinates. The interface would simply move the picked points to match the finger positions as best as possible. This makes for a very intuitive interface, as the model stays under the connected styli/fingers directly. Zooming, panning and even 3D rotations come out of the box. For rotation I would lock the up vector, and just rotate accordingly. Below is the panning code. https://www.babylonjs-playground.com/#C2ZGCJ#1