Hi all,
Attached is Zap Andersson's halftone shader running in Octane.
This is from here:
https://github.com/ADN-DevTech/3dsMax-OSL-Shaders
Update: I have made some tweaks and added another way to use the shader.
Ideally you would do some post to apply this effect, which you can do currently using render jobs:
Otherwise an alternative is to tweak the imager so that it looks correct from a particular angle: