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

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

Could someone help me out with some code to get me started?

thanks

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