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] usbve> 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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