MVSmith wrote:
> OK, mea culpa...Isect is a macro, documented in Help, 7.13.1  shapes.inc,
> which is indeed a wrapper for the trace function.
>  
> Spent a little time stripping some code down to a test case, which
> follows at the end of this msg. 

This is about as far from a minimal test scene as it can get.  A minimal 
scene would look like:

#include "shapes.inc"

#local Object = object { ... }

#local isIntersection = Isect(<point>, -y, Object, intersectPoint);

#debug str(intersectPoint.y,0,6)

> I've also attached three files zipped 
> together:

Never post binary attachments to a non-binary group.

Christoph

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