Overall, I am pretty happy with the YCbCr space in terms of the slightly smoother color blends. I have included a few more pictures that show where things are going with the aurora rendering. In the mid-term, there are three major projects to address before this can be called research, or at least artistic:
1) I have to add support for colliding splines to make sure that the colors can mix in a convincing way, rather than just coming up with a muddy gray as I have been thus far. Lucky has some code for his Starlight project, and I think I might be able to glean a few secrets from that.
2) We need an alpha mask of some kind for blending the aurora itself into a background image, like a mountain scene. This should also serve a dual purpose of mitigating any problems with the edges of the aurora being too sharp (which they are right now).
3) We need a brightness mask so that we can perform an adjustment on the aurora to make it look bright on the bottom, probably along a curve roughly parallel to the aurora's NURB-spline itself.
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