Better Dust

I worked for quite a while trying to get energy conservation working and looking good in the tracer.  The results are great, as the hazy scattering effect is much cleaner and more pronounced.

The gas in this scene is concentrated around the light, and is distributed with a density that varies according to the sine of the horizontal axis (hence the visible bands in the gas).  That's an intentional effect to test how the scattering looks in a non-homogeneous distribution of gas.  This look is just what I had hoped for!