MDenham wrote:

> 
> 1) the axis of anisotropy
> 2) the "ordinary" axis
> 
> It turns into a useful (though limited) form of the otherwise not-gonna-happen
> "variable ior" request thanks to this.  (Generalized variable ior isn't going
> to happen for reasons that are mentioned in the documentation, such as
> "pockets" of high IOR - or even not-so-high IOR - having potentially
> pathological behavior.  You'd need to switch to a solely
> rays-start-at-light-sources approach - photons, only slower - to make this even
> slightly viable, and that kind of rewrite probably isn't worth it.  [If it turns
> out that it's necessary for a "good" spectral system, then we may have issues.
> :-D])
> 

Ah, and here I was thinking it was just as simple as tracing a second 
refraction ray.

Bummer.

-- 
~Mike

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