I'm making a class scene, and I've made a simple projector that displays an image on a whiteboard, everything works just fine, but the image has the perspective that is normally cancelled to look squared in real life projectors. So is there a way to cancel out that warping with nodes? I'd prefer not to manually correct the images somewhere else.

The problem in question

If it wasn't clear, I'm trying to scale the top part up horizontally.

My node setup

This is the node setup is very simple, just an image connected to the emission color with some mapping stuff to remove the pincushion effect.

  • 1
    $\begingroup$ It depends on your set up.. this may work.. could you show us your light-nodes? $\endgroup$
    – Robin Betts
    Feb 8, 2021 at 17:23
  • $\begingroup$ Yes, that absolutely answers my question, thanks! $\endgroup$ Feb 8, 2021 at 17:32
  • $\begingroup$ You might want to consider mapping the image directly to the screen with an emission shader, that way you don't need to worry about keystoning. Most effects in 3D are just about how to fake things anyway. $\endgroup$
    – susu
    Feb 9, 2021 at 3:15


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