In article <38CB89DE.5E11B30F@pobox.com>, Anton Sherwood 
<bro### [at] poboxcom> wrote:

> The simplest thing would be intersections with a plane at the
> appropriate angle.

A rotated box might be faster, just make sure it is big enough.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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