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 The code isn't public yet; I just saw the demo, and I believe it's rendering the same objects on the left and right with different camera settings. When the window moves, the x, y coordinates of the right object update in both renderings. 
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 isn't this it? https://github.com/bgstaal/multipleWindow3dScene 
 Yup 
 Here play wit it https://bgstaal.github.io/multipleWindow3dScene/ 
β–² β–Ό
 Ok! TIL! And it doesn't even get confused by my two screen setup which makes me wonder about fingerprinting. I didn't know apps could look that far outside their own window.