The problem with seeing spots on the wall is that you have to trace the ray
from the opposite direction, i.e. from the light source to the eye. 
POV-Ray traces from the eye to the light source, and since the wall
scatters light, there's no way to know that the ray needs to be traced back
to a specific light source that is creating a spot.  One way around it
might be to make your disco ball a hollow sphere with a light source
inside, and holes in it.  That way the solid parts of the sphere might cast
shadows on the wall where the light isn't hitting, and leave bright spots
where the light leaks through.

Just an idea.  I haven't tried it.

--Gary.

Alil <e9725415@stud3.tuwien.ac.at> wrote in article
<35517749.D4BFCAEA@stud3.tuwien.ac.at>...
> Jarich Koning wrote:
> 
> > I have tried to make a disco-ball, wich gives you those nice spots on
> > the walls. However, povray doesn't seem able to do this: the reflection
> > of a beam of light from a spotlight via a mirror onto the wall. Am I
> > doing something wrong? Is there anyone out there who tried this also?
> > I've been looking through the docs that came with povray, but couldn't
> > find anything...
> >
> > Regards, Jarich
> 
>   Use Povray 3.x and render with radiosity then you schould see any
> reflection on the Wall
> 
>             ALIL
> 
> 
>

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