In article <3A1### [at] maccom>, mck### [at] maccom wrote:

> Except that the hollow keyword causes a very thin skin of glass on a
> volume of media,

Wrong. The "hollow" keyword only affects media, the cylinder is still a 
solid object, it just can be filled with media.
If you want to put media in a glass tube, use CSG difference to subtract 
a smaller cylinder from the larger one to make your glass tube, and put 
another small cylinder inside it, slightly larger or smaller than the 
other tube to avoid cooincident surfaces. Only this smaller cylinder 
needs to be hollow and filled with media.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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