Le 05/03/2014 02:33, Bald Eagle nous fit lire :
>> ... 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.
> 

try one thing (for the experiment): replace the horizontal cylinder with
4 or more cylinders of same radius, but reduced length. (each ends of
the new cylinders touching or inside another cylinder; if using
transparent texturing and/or interior, put them in a merge{} )

There might be something about the relative dimension of the cylinder,
as the povray never looks at your L x R cylinder, but use a
transformation to a unit cylinder... it might be yet another strike of
Epsilon filter or something similar.

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