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Kenneth napsal(a):
> "gregjohn" <pte### [at] yahoo com> 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.
>
What if the trace misses the object?
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