If someone has some time to spare and would like to play with a new toy, I've made a SeExpr script for Krita that creates a 3-point perspective grid. It's not difficult to use (you don't need to know how to code etc.) but I want to get some feedback to possibly improve it to make it easier/nicer for people to work with. The image here shows three different generated grids.
(You'll need a dev version of Krita if you want to try it).
Instruction and link to the script:
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