The way blender does if I’m not mistaken is to simply draw in OpenGL, it’s not real geometry, and it just draw a certain distance from the camera in a plane aligned with the view, so if you move or rotate and draw again it draws in a new plane…
Ui wise would need to b a new feature, maybe like masking, it would activate a draw mode and if inverted an eraser mode… I could try to sketch something if u guys think it’s interesting…
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