"William Pokorny" <pokorny_epix_net> wrote in message
news:web.410a56e9308ef1f01837413b0@news.povray.org...
>

Here's another picture I did, different color bottle, using photons, with a
slight normal applied to the glass (tiny bumps stretched along x,z).  The
wood could be better, but it's just there for a surface.

> Looks good. Check your adc_bailout setting. I vaguely remember some
comment
> about adc_bailout not working properly with release 3.5 so you might want
> to try POV-Ray 3.6.

Unfortunately, I'm using MLPov (based on 3.5) for the HDRI. :-(
However, I'm planning on doing a few experiments with bottles using
different lighting.  Suddenly, I have a bottle interest spawned by a recent
photography book I bought.

>
> I think what is happening with an object like this is that you can end up
> with rays which bounce around inside the object especially in the planes
> intersecting the light source(s) and camera locations. For most images I
> think you can get away with much lower settings for the max_trace_level
> even when glass is involved. I usually set max_trace_level a count or two
> above the number of surfaces through which rays must pass in a scene. For
> your bottle I would try a setting of 6 and only increase it if the image
> color looks wrong or if black patches appear.


I did a few renders at various settings.  It seems to look just fine with
max_trace_level at 10, actually.

-- 
Jeremy
www.beantoad.com

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