I noticed one variable which you seem to have missed: ray direction. The
normal variables really aren't as useful without this...I can think of a
couple very interesting uses combining these variables.
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Christopher James Huff - Personal e-mail: chr### [at] yahoo com
TAG(Technical Assistance Group) e-mail: chr### [at] tag povray org
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/
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