Le 15-01-05 03:17, Thomas de Groot a écrit :
> Ah yes! That is what I need in addition. Thanks! I was thinking of using
> a media in combination with the ring particles but this would be much
> better indeed.
>
> Note that the particles are also traced into a ring pattern Ideally, the
> isosurface should mimic that too.
>
> Thomas

Just add a wood or onion pattern to the function, or an image pattern to 
get a beter control.

#declare f_particles = function(x,y,z)
{
   0.8 - f_crackle(400*x,400*y,400*z) +
   0.1 * f_granite(500*x,500*y,500*z) +
   0.9 * f_onion(500*x,0,500*z)
}



Alain

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