> I'm laying out a large facility, and trying to view a tiling grid and
> some layout lines.  I've noticed that when I zoom way out, I lose some
> lines, and get tricked into thinking they're not there, which gives the
> floor tiling grid an effect that fooled me into thinking I'd messed up
> the scaling.
> Some of the yellow layout "lines" (and these are HUGE cylinders) also
> inexplicably disappear when I zoom out.  Rotate view y*90, and the other
> lines disappear!
>
> I'm a little lost as to what's going on, why, and how to fix it.
>

Whenever any object dimention is less than one pixel in some direction, 
you risk totaly missing it. For a long cylinder, you may see part if it, 
but not some other parts. Antialiasing often don't help here, only 
making the visible parts fade in and out of view. Using uberPOV and +am3 
can greatly help in this case.

If some object are *VERY* large, they may end up disapearing totaly. It 
can appen when the dimention exceed 1e6. For your cylinders, if they are 
that long, it's a good idea to split them into a collection of shorter 
ones. This may also make the scene render faster as you can get beter 
bounding.

A possible solution is to change the radius of your cylinder according 
to the distance/zoom. It may even be advisable to use cones instead of 
cylinders.



Alain

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