"Thorsten Froehlich" <tho### [at] trfde> wrote:
> In article <c9vdmc$64c$1@chho.imagico.de> , Christoph Hormann
> <chr### [at] gmxde>  wrote:
>
> > I really can't see a reason why one would try to use something like
>
> I guess it is some program generating this output.  As you apparently have
> both 3.5 and 3.6 running, could you try to comment out one of the parameters
> until you find the one interpreted differently?
>
>     Thorsten
>
> ____________________________________________________
> Thorsten Froehlich, Duisburg, Germany
> e-mail: tho### [at] trfde
>
> Visit POV-Ray on the web: http://mac.povray.org

I'll try later this week, I'm currently working nightshift, and
today we start at 2000, so I won't get out of bed until 1300 or so..
Terribly sorry!
                               Greetings from the Swedish summer
                               (not a polarbear in sight ;)

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In article <web.40c346e89346345c307441310@news.povray.org> , "fomhorian" 
<fom### [at] hotmailcom> wrote:

> "Thorsten Froehlich" <tho### [at] trfde> wrote:
>> In article <c9vdmc$64c$1@chho.imagico.de> , Christoph Hormann
>> <chr### [at] gmxde>  wrote:
>>
>> > I really can't see a reason why one would try to use something like
>>
>> I guess it is some program generating this output.  As you apparently have
>> both 3.5 and 3.6 running, could you try to comment out one of the parameters
>> until you find the one interpreted differently?
>>
>>     Thorsten
>>
>> ____________________________________________________
>> Thorsten Froehlich, Duisburg, Germany
>> e-mail: tho### [at] trfde
>>
>> Visit POV-Ray on the web: http://mac.povray.org
>
> I'll try later this week, I'm currently working nightshift, and
> today we start at 2000, so I won't get out of bed until 1300 or so..
> Terribly sorry!

My reply was to Christoph.  Nothing for you to worry about :-)

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

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In article <c9vgh2$6vg$1@chho.imagico.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

> It seems to be the reflection 'exponent sqrt(2)'.

OK, so in conclusion that setting should be changed in fomhorian's scene and
it will work.

> Note i also get
> occasional render freezes (i.e. the render halts and the program can
> only be stopped by multiple CTRL-Cs) in 3.6 when using the fresnel
> reflection.

Sounds like stack overflows.  I will need to take a look at the fresnel
implementation to find out what that happens.

>  Since i never had any problems with fresnel reflection
> before i assume this is something specific to this scene (i.e. the
> mesh).  Lowering max_trace_level strongly or not using radiosity avoids
> this (so maybe the ray recursion handling of radiosity in combination
> with reflection does not work properly although i have rendered a lot of
> scenes with radiosity + reflection without problems).

OK, if you find some time, take a look.  Otherwsie, we won't bother for 3.6.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

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news:c9vgh2$6vg$1@chho.imagico.de...
> It seems to be the reflection 'exponent sqrt(2)'.  Note i also get
> occasional render freezes (i.e. the render halts and the program can
> only be stopped by multiple CTRL-Cs) in 3.6 when using the fresnel
> reflection.

For the record, I also observed an extremely nasty combination of mesh,
radiosity, reflection and prism (!), generating large black artifacts where
3.5 performed OK. Unfortunately I wasn't able to replicate it using a
smaller scene (the scene I used is around 50-100 Mb), so I couldn't report
it. But something is definitely lurking out there...

G.


-- 
**********************
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**********************
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- POV-Ray and Poser computer images
- Posters

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Christoph Hormann <chr### [at] gmxde> wrote:
> Thorsten Froehlich wrote:
> > In article <c9vdmc$64c$1@chho.imagico.de> , Christoph Hormann
> > <chr### [at] gmxde>  wrote:
> >
> >
> >>I really can't see a reason why one would try to use something like
> >
> >
> > I guess it is some program generating this output.  As you apparently have
> > both 3.5 and 3.6 running, could you try to comment out one of the parameters
> > until you find the one interpreted differently?
>
> It seems to be the reflection 'exponent sqrt(2)'.  Note i also get
> occasional render freezes (i.e. the render halts and the program can
> only be stopped by multiple CTRL-Cs) in 3.6 when using the fresnel
> reflection.    Since i never had any problems with fresnel reflection
> before i assume this is something specific to this scene (i.e. the
> mesh).  Lowering max_trace_level strongly or not using radiosity avoids
> this (so maybe the ray recursion handling of radiosity in combination
> with reflection does not work properly although i have rendered a lot of
> scenes with radiosity + reflection without problems).
>
> Christoph
>
> --
> POV-Ray tutorials, include files, Sim-POV,
> HCR-Edit and more: http://www.tu-bs.de/~y0013390/
> Last updated 01 May. 2004 _____.//^>_*_<^/.______

Good morning folks!

Yes I too boiled it down to the 'exponent sqrt(2)'. the scene looks
fine as long as I use an exponent <= 1.0 in POVRay 3.6 .
Freezez? No, haven't come across those...

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Attachments:
Download 'stormer_pov36_exponent1.jpg' (63 KB)

Preview of image 'stormer_pov36_exponent1.jpg'

A small addendum here:

I did the same scene with sphere{}, and other basic POVRay
objects, and fresnel exponent 1.5 and got the same strange result.
So it is not my mesh...

Oh:
>You don't seriously want to call that minimal, do you?

When I started with POVRay back in 1999 on my Pentium 75mhz
and DOS; I had meshes, in smooth_triangle, up to 35 megs!
Imagine the loading-time for those ;)

                              ..And I'm off for breakfast..

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