>    Thank you to everyone, you've been extremely helpful! I have just one
> more question on this subject. The media glow effect that I created using
> the code all of you provided works very well. The only thing wrong with 
> it,
> is that the brightness of the glow doesn't fade at the edge, it's just a
> sharp, though translucent, edge. I hope that makes sense. How can I change
> this? Again, thanks for all of your help!

If you want to not see the edges you need to fade the color_map
for the density to clear at the edges.
[0.0 rgb <0,0,0>]

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