Thanks shvrdavid! I've successfully made shaders like the glow one from your last comment based on what you posted earlier. What I'm looking for is a way to make a simple glowing ball that is brighter in the center and has an unsharp border. A scatter volume with a point light in the center and its density depending on the radius would do that, but that's just a pain to get the coordinates to match up for. Maybe a prop light using the ray length property is the way to go here, as you've shown above. If I come up with any nice-looking results, I make sure to post them here.

-- I'm not mad at you, just Westphalian.