Colormaps
GZDoom Builder comes bundled with a RGB sector colouration editor, and can render sector settings like this in 3D mode. If it could be hacked to help render and manipulate colormaps, that would be fun.
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HIGH PRIORITY - Render colormaps in 3D mode. -
Medium Priority - Render colormaps at the correct alpha value. -
low priority - allow for manipulation of sector colormaps with a modified/hacked RGB colour editor.