How do I set up post-processing to make only one object in the scene glow, not all of it?

This does not address the original issue. Nevertheless it shows an alternative approach without post-processing. A selective bloom can be faked by stacking several objects with decreasing opacity.

Try it here: https://codepen.io/boytchev/full/ExdmvxE

image

And a close-up:

image

3 Likes