Over on the PMG main site, I've posted a breakdown of my first pass at doing a shader-based paintbrush, which is obviously going to be a key component for the game.

The shader: https://www.shadertoy.com/view/Dt2XWG

The breakdown: https://perfectminutegames.com/index.php/2023/02/20/paint-by-monsters-devlog-5-s...