Hi Greg,

nice animation, but a lot of questions arise !

But OK, I've selected only one question : 

In your animation, what is the link between the surface and the position
of the spheres ? Well in other words, how do you know the height (z) of
the surface at a given (x,y) point ? Don't you need this to make any
spheres rolling and not flying over the surface ? In fact I'm looking
for a way, given a height_field object, to know what will be the height
(z axis) of a point given its coordinates (x,y). I suppose it would be
not so much simple to read the source picture used to make the
height_field (considereing the different format possible in use). I
haven't been able to find anything embeded in POV-Ray that let the user
access this value from a povray source file (within a macro in
particular), maybe I have missed it ?

Else, maybe the surface you are using is particular ? 

Thank you for any answer !

Denis.

"Greg M. Johnson" wrote:
> 
> Ian Witham wrote:
> 
> > that green ball that the camera follows should be invisible no?
> 
> It doesn't have to be, it behaves like all the rest, I just picked one that
> wasn't all by itself at the end..
> 
> Tony asks:
> >Do they slow down?
> 
> This version had:
> #declare actorv[n]=0.9975*actorv[n]+acceleration;
> 
> It's funny that at even 0.995* ,  the particles slowed down so quickly it was
> boring.....

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