Bryan Valencia <no### [at] waycom> wrote:
> kike wrote:
> > www.enriquesahagun.es/cgsperiment.avi

SORRY, dont know why the codec I used doesnt work, I'll try with another codec.
But anyway, it was just this:

difference{
sphere{...  translate clock*x}
cylinder
}

this way you can see the sphere while is not in contact with the cylinder (the
cylinder, this way is not visible). Once the sphere is in contact with the
cylinder, the sphere disappears as well. So you reach the effect that there is
something invisible avoiding the visibility of the sphere.

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