Alain <ele### [at] netscapenet> wrote:
> > The only problematic thing with this might be if the light source itself is
> > directly visible from your "test surface", as you want to eliminate the (most
> > likely not really exact) conventional lighting. I don't know by heart whether
> > you can turn off conventional lighting completely and just use photon mapping.
> You can. Set ambient to zero. Make sure that the light_source never encounter
> the target plane in the visible area. A way to do that is to have a transparent
> object in front of the light_source, a whide and thin box with pigment{rgbt 1}
> will do just fine.

I'm not sure how this will stop the classic lighting from the light_source, as
the object will not cast a shadow. And using an opaque "light block" will also
block photons.

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