code/modules/unit_tests/~nova/custom_sprites/preview_glow.dm 
| /proc/custom_sprite_test_lit_pixels | Pixels of a picture that light what is under them on the emissive plane, red or green, as list("x,y"). |
|---|---|
| /proc/custom_sprite_test_open_region_pixel | The middle of a region's pixels in a view that nothing drawn over the body covers, as list(x, y), or null. |