In article <3ab00fe5@news.povray.org>, "John M. Dlugosz" 
<joh### [at] dlugoszcom> wrote:

> difference {
>    intersection {
>       cylinder { <0,0,0>, <0,18,0>, 12 }
...
>    cylinder { <0,0,0>, <0,18,0>, 11.5 }

You have a coincident surfaces problem here...try using < 0, 18.001, 0> 
in the second cylinder.

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

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