Tim,

You amaze me.

This is an interesting technique you have there. I've looked at your image
and the specular reflections of photons are currently too obvious as the
caustics on the floor and on the the two walls behing clearly shows. I think
that something that might help diffuse the caustics a little more would be
to add a very rough bump material on the surface of the reflecting objects.

White Zebra

"Tim Nikias" <tim### [at] gmxde> wrote in message
news:3e557c32$1@news.povray.org...
> Okay, I'll post the example scene right after I wrote this
> post.
>
> Its actually a little tricky:
> First, the object that will cast photons will need no_image,
> in order for the object to not show up when rendering.
> Still, it will casts shadows and reflect photons.
> Then, a second object is needed, which will use
> no_shadow (since one is already cast by the first
> object) and it has to be slightly larger, since photons
> don't like coincident surface (like nothing in POV does ;-).
>
> For this to work, I've also written a macro which takes
> care of these things all by itself. You need to supply
> an object (without any texturing), a transform that will
> be applied to it (like transform{translate <5,11,2>})
> and two materials (since materials include everything,
> ranging from pigment, normal, finish to interior):
> One material which will have an effect on how and
> in which color the photons are reflected (and thus needs
> some reflection statement), the other can be any kind
> of material (but doesn't need reflection, for your intended
> diffuse look).
> After these four things are declared, you call the macro and
> feed it the desired options, and voila!
> A diffuse object casting photons!
> (see binaries.images)
>
> Regards,
> Tim
>
> --
> Tim Nikias
> Homepage: http://www.digitaltwilight.de/no_lights/index.html
> Email: Tim### [at] gmxde
>
>

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