Or: Render the background with a spherical camera and use the rendered image as
a background (with sky_sphere) for the actual animation.

Depending on the resolution of your final animation and the camera angle you're
using the background image should be rendered with a width of approx
2*final_image_width*360/horizontal_viewing_angle in order to prevent both
blurry appearance (resolution too low) and flickering (resolution to high).

Hope that helps!

Regards Roman



Alain <ele### [at] netscapenet> wrote:
> james lake nous illumina en ce 2008-06-17 23:30 -->
> > Hello:
> >
> > I am using the jslstarfield (below) to generate a space scene background.  The
> > problem is that whenever I move the camera, or the starfield itself, the
> > resulting starfield background appears to randomly re-generate with each frame.
> >  This gives the animation a bizarre appearance (even when I move the camera a
> > very small distance, say 0.00001*clock).
> >
> > What can I do to fix this?
> >
> > #declare jslStarfield =
> > texture {
> >   pigment {
> >     granite
> >     color_map {
> >       [0.00 0.76 color Black  color Black]
> >       [0.80 0.82 color Gray20 color Gray40]
> >       [0.82 0.84 color Gray40 color Gray60]
> >       [0.84 0.86 color Gray60 color Gray80]
> >       [0.86 0.88 color Gray80 color Gray95]
> >       [0.88 0.91 color Gray95 color White]
> >       [0.91 1.00 color Black  color Black]
> >     }
> >     scale .015
> >   }
> >   finish { ambient 1 diffuse 0 }
> > }
> >
> > #declare StarSphere = sphere { <0,0,0>, 100000
> >   inverse
> >   texture { jslStarfield scale 1  }
> > }
> >
> >
> The pigment used relies on sub-pixel details to simulate the apearance of a star
> field. An extremely small movement will cause a ray that hit a bright spot to
> completely miss it after the move.
> The solution would be to keep the camera stationary and move the rest the scene.
> You can do this by binding the whole scene, exept the camera and the world
> sphere, in an union and apply the translation to the union.
> While that will work for translations, it will not for rotations where the
> visible part of the star field change.
>
>
> --
> Alain
> -------------------------------------------------
> EVERYTHING HAS A GENDER
>
> You may not know this but many nonliving things have a gender...
>
> A Hot Air Balloon is Male, because, to get it to go anywhere, you have to light
> a fire under it, and of course, there's the hot air part.

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