William F Pokorny <ano### [at] anonymousorg> wrote:
> I was able to render the attached image by making the changes outlined
> in the in-lined patch file. Indeed it looks like we need collect to be
> on in the refraction block and this doesn't match the recommendation in
> the documentation for glass-like objects as I understand it.

Collect on does the trick.  Mysterious.  Perhaps the dev team can shed light on
this, but they haven't weighed in yet.  (My days of heavy-duty coding seem to be
over; I cannot take the stress.)

None of your other changes were necessary, nor were they sufficient in my tests.

You shall get a shout out in the next update of BeamTest.

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