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Hrm. While I think the shadow/caustics look better on the right side, I like
the glass itself better on the left pic.
--
Paul Vanukoff
"Alberto" <jac### [at] usb ve> wrote in message news:39DF469B.BA9559C2@usb.ve...
> Here are some considerations about photons I'd like to share.
>
> The left image is the normal render you get with one light source. In
> my
> opinion, the dark shadows cast by the glass are to dark. I have
> observed
> this kind of refractive caustics in some experiments I have done with
> real
> glasses and lights, so they are right from the physical point of view as
> remarked by N. Kopp elsewhere in this newsgroups. In the other hand,
> the
> reflective caustics are to bright.
>
> One extreme solution to both is to shut down photons all together. We
> all
> know that in most scenes this is a bad solution. There is an
> intermediate
> solution. Turn on a second light source (in the same position off the
> original one) with reflection and refraction off. The result is shown
> in
> the right image. The light that shoots photons has rgb .12 and the new
> one, rgb .88 (this settings may not be the best ones). The rendering
> time
> of the two images are more ore less the same. The slowing down due to
> the
> two lights is partially compensated by less sampling needed in
anti-aliasing.
>
> BTW, here are the settings for the glass:
>
> pigment{rgbf <.94, .94, .94, 1>}
> finish {ambient 0 diffuse .5 reflection 0.065 specular 1 roughness
.005}
> interior{ior 1.5 media{absorption <1, .75, 1> density{rgb .01}}}
> photons{target 1 reflection on refraction on ignore_photons}
>
> They work well with global_settings{adc_bailout .05 max_trace_level
100}.
>
> Finally, this are only my opinions and you may have other
ideas/solutions.
>
> Alberto.
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