"Mutley2003" <nomail@nomail> wrote:
> Hi
> L'd like to write a little macro that gives me a diagnostic of which objects
> are visible in my scene (ie the observer can see, that are not occluded by
> other objects)
>
> It seems maybe I could use the direction vector (of the camera) and the
> trace() function coupled with min_extent() and max_extent(), with debug to
> print stuff out, but my feel for the SDL is not too good just yet
>
> a) how do I retrieve the direction vector? .. there does not seem to be any
> notation like camera.direction or camera$direction

I would do something like this:

#declare camloc = <whatever vector you want>;
#declare camlook = <blah blah blah>;
#declare camdir = camloc-camlook;

camera {
  location camloc
  look_at  camlook
}

and that way you have your direction vector neatly #declared.



> b) is there an accessible  collection of objects that I can iterate across?

That I'm not too sure about, sorry.

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