Thanks.  I had been using photons.  I think my pipe just needs more work ...


> It does do total internal reflection realisticaly, but... for the light 
> from a light_source to do it, it must emit photons.
> You need to add a protons block in the #global_settings{}
> You also need to add a photons block to your object. That one will look 
> like:
> photons{target refraction on}
> You can also add "reflection on" but probably don't need it.
> In your case, you probably also need to increase the max_trace_level, 
> possibly to it's maximum value of 255.
>
> Read section 3.6.3  Photons in the documentations.
>
> -- 
> Alain

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