"gregjohn" <pte### [at] yahoocom> wrote:

>   And then be sure to reset the norm back to
>   zero at before the next time you use it:
>
> #declare norm = <0,0,0>;
>
> > #end
> >

I don't think that's necessary (I've never found it to be.) norm just needs to
be 'created' once--as kind of an empty placeholder for the normal vector(s) that
will be found by tracing. (It can be set up with *any* three values, actually.)
Then each time trace traces the object, norm will be filled with a REAL normal
vector. No need to 'empty it out' each time.

Ken W.

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