Am 08.04.2010 05:46, schrieb Dre:

>> I've been trying and trying and I cant get it to work.  I've successfully
>> used the trace() command on isosurfaces and simple boxes, spheres but I
>> cant for the life of me get this to work.

How does the failure-to-work manifest itself? Are we talking e.g. about 
a parser error?

> This doesn't work:
>
> #declare norm =<0, 0, 0>;
> trace(object,<xPos, 10, zPos>,<xPos, -10, zPos>, norm>)
>
> Yet this does:
>
> #declare norm =<0, 0, 0>;
> #declare startPoint =<xPos, 10, zPos>;
> #declare endPoint =<xPos, -10, zPos>;
> trace(object, startPoint, endPoint, norm)
>
> Unless I'm doing something wrong, that seems broken to me...

Well, unless you introduced a typo when writing this posting, I'm not at 
all surprised: In the non-working example, you have an extra ">" after 
"norm". I'm not sure what the parser makes of this, but most likely not 
what you expected.

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