> Compare these two frames from an animation of a roller coaster I'm
> working on.  Notice that in the second frame, the track spine has
> disappeared.
>
> Throughout the animation, the track spine disappears randomly for
> 1-3 frames at a time.  What would cause this?


Try MegaPOV if you haven't already, I found that with the original POV I get 
many bugs and sometimes parse errors when using splines and sphere sweeps. 
MegaPOV seemed to fix it. Also I found replacing the sphere sweeps with 
spheres connected by cylinders made render times much faster and without 
much loss to quality (you should choose a good spacing for the spheres). 
Just my 2 cents.

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