James D wrote:
> Looks good.  But I don't know, the shadow looks strange.

It's the glass' IOR (incidence of refraction?) that stops light passing 
directly through. As glass gets thicker it's more pronounced so that 
although it appears clear (the thin-end of the cone), almost no light 
passes directly through it, thus you get a dark shaddow. All the light 
entering that end is bounced around inside and end up exiting further up 
the cone at almost the same point as every other bit of light, thus you 
have the ultra bright patches.

Sorry if this is a bit 101 ...

Cheers!
Rick

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