I'm using POV-Ray 3.1g.  The documentation includes an example of a surface
of revolution (see "Surface of Revolution Object" under the help index) for
creating a goblet.  The image shown in the help file shows both front and
back sides of the object reflecting, but when I run the same code I get
reflection from the front only.
Is there some magic configuration option for enabling reflection from both
sides of a surface?  What am I missing?

Thanks,

Mark Harris

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