> Here are the first 10 PNG frames (all 300 frames are like 30MB, and the first 10
> are sufficient to demonstrate the problem):
>
> http://dl.dropbox.com/u/29966/povray/from_mars.zip
>
> You can move through them with an image viewer. The stars appearing and
> disappearing between frames are clearly visible.
>
> I am using povray 3.6.1 on Ubuntu Linux 10.04 32bit. The command line was:
>
> povray from_mars.pov +W1920 +H1080 -visual DirectColor +A0.1 +AM2
>
> How is my system different from yours that causes flickering here but not there?
>
>
In your animation, it's mainly the fainter stars that flicker. Those are 
to small to appear in my test renders.
My test used a much lower resolution and not the same aspect ratio: 
+w800 +h600 +a0.2 +am2

With the kind of pattern used, it's not realy surprising.

A possible workaround:
Render an empty scene with only the background.
In the animation, use a large box or a plane somewhat behind the 
farthest object.
Apply the prerendered background to that object as an image_map, scale 
appropriately to cover the visible area. It may be interesting to post 
process that image by bluring it a little.
Translate that object in parallel with the camera during the animation.



Alain

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