> ... it appears
> that when you zoom out, the grid lines and the yellow cylinders become less than
> one pixel wide.  When this happens, the rays traced can easily miss the object.

OK,  I'm following your reasoning here, but I'm seriously doubting 
that's _really_ the case since the vertical cylinders show up, and the 
horizontal one is GONE. The bloody thing's a foot in diameter!
And why would SOME grid lines show up (shouldn't they all be the same 
pixel width?) and others not?  It's just ... odd.

I'll see if I can calculate the expected pixel width and try to see 
what's what.  Good thing there's coffee left.  :)

> An alternative is to scale the width of the grid lines in proportion to the
> distance of the camera from the facility.

That's a _good_ idea, I'll try that.

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