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fomhorian wrote:
> Okidoki, but I don't know if it is that small...
You don't seriously want to call that minimal, do you?
The most likely explanation of the difference you observe is that one of
your extremely ugly finish parameters is interpreted differently in 3.6
as a side effect of another change. When i remove all those finishes
the results i get in 3.5 and 3.6 are idetical.
I really can't see a reason why one would try to use something like
finish{
ambient 0.05
diffuse 0.4
brilliance 2.5
metallic 1.5
specular 2 roughness 0.05
phong 0.5 phong_size 30
reflection{
<0,1,0.5>*0.005,0.05
metallic 0.25
fresnel on
falloff 0.5
exponent sqrt(2)
}
}
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 01 May. 2004 _____./\/^>_*_<^\/\.______
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In article <c9vdmc$64c$1@chho.imagico.de> , Christoph Hormann
<chr### [at] gmx de> wrote:
> The most likely explanation of the difference you observe is that one of
> your extremely ugly finish parameters is interpreted differently in 3.6
> as a side effect of another change. When i remove all those finishes
> the results i get in 3.5 and 3.6 are idetical.
Well, the point is not if they are ugly but if they are valid. We should
try to figure out which change causes this and maybe issue an error if any
of the specified parameters is outside valid bounds (assuming that is the
problem)...
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 <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
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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 _____./\/^>_*_<^\/\.______
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"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.
--
**********************
http://www.oyonale.com
**********************
- Graphic experiments
- 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...
Post a reply to this message
Attachments:
Download 'stormer_pov36_exponent1.jpg' (63 KB)
Preview of image 'stormer_pov36_exponent1.jpg'
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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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