OK.  It turns out that, although media is supposed to be contained within a
unit cube, it really isn't.

If you lok at my inc file, you'll see I used a unit cube box to contain the
media so it could be rendered.  Well, if I change the box specification from

 box{ <0,1>

to

 box{ <0,0,-2>, <2,2,2>

the problem goes away, as one can see in the attached image.  Hopefully this
does not indicate there is a bug in megapov.

Thanks for your suggestions!

Jim

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