How to add a selective glow effect that works with dark colors too?

If you are crazy enough, you could try:

  • fake bloom effect (it may have any color, lighter or darker than the rest of the scene). An example of fakeness: https://codepen.io/boytchev/full/ExdmvxE
  • be negative – use the bloom on the inverted scene (so the dark object is bright and the bloom is bright), then again invert it (thus the bloom becomes dark).
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