"Christoph Hormann" <chr### [at] gmxde> schrieb im Newsbeitrag
news:8cu### [at] tritonimagicode...
> MVSmith wrote:
> > In an earlier posting (on 20040121), I requested info on "scanning"
> > unions and differences of objects to read off height-field data from the
> > composite structure and thence out to a text file. A day or two after
this
> > I discovered the isect() function, which seems to do the trick.
>
> I don't know such a function, neither in POV-SDL syntax nor in the
> POV-Ray source code.

It's a macro in shapes.inc. From the docs:

"Isect(Pt, Dir, Obj, OPt) and IsectN(Pt, Dir, Obj, OPt, ONorm)
These macros are interfaces to the trace() function. Isect() only returns
the intersection point, IsectN() returns the surface normal as well."

Regards,

Marc-Hendrik

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