Jim Holsenback nous illumina en ce 2009-03-30 08:52 -->
> "clipka" <nomail@nomail> wrote in message
> news:web.49cfaf4030aab812ea392f10@news.povray.org...
>> Can you post a shot of the issue?
> 
> In this image the ior=1.25 ... it shows the artifact clearer, at ior=1.5 the
> pattern is repeated multiple times.
> 
> The flame macro has three media containers, two near the flame itself
> (spheres) and a cylinder going up in y dirirection.
> 
>> I'd expect you to be experienced enough to make sure the flame container
> doesn't
>> intersect with the glass globe, so I'm very curious what type of artifact
> you
>> have dug up there.
> 
> yes, that was one of my first stops in my trouble shooting process ... I
> have a conditional that allows me to switch from textures to pigments with
> no transparency.
> 
> the z axis runs through flame adjust and the sphere containers near the
> flame are irregular scaled (thin in x dir)
> 
> when I run into problems like these I always turn to the documentation for
> ideas and played around with maxtracelevel. I had 20 in globals block ...
> tried doubling it several times and the problem got worse. decreased it and
> I reproduced the black effect that overlapping media containers causes. one
> test I didn't do was without radiosity ... I'm not sure if that's worth the
> effort adcbailout maybe??? But I'm not sure if that makes sense either. As I
> said before the scene seems mechanically sound (not collisions) .... I'm out
> of ideas.
> 
> 
> 

Does your glass have a thickness, or is it solid trough?
Now, there is a magnifier like effect that should NOT be there. Then, the 
flame's container apears to have an ior of 1.000.

-- 
Alain
-------------------------------------------------
Don't try so hard, the best things come when you least expect them to.

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