Warp wrote:
> 
> Warp <war### [at] tagpovrayorg> wrote:
> :   I'm making a 20-hour render with higher quality to see what happens.
> 
>   As I thought: A lower error_bound (and higher count) gives a more accurate
> lighting, but horrible stains of dark/light areas. Aargh!
> 

That's life...

Cou can try even higher count or tweaking the other parameters, but
probably things will get really hard with such a scene.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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Christoph Hormann <chr### [at] gmxde> wrote:
:>   As I thought: A lower error_bound (and higher count) gives a more accurate
:> lighting, but horrible stains of dark/light areas. Aargh!

: That's life...

  No, I personally think that it's a bug.
  To me it looks a lot like there's a coding mistake, or else some
algorithmic mistake in the radiosity code. It could perfectly be something
really, really simple (eg a '<' when it should be a '<=' or something similar),
although it could also be something a lot more complicated.
  In theory, lowering 'error_bound' and increasing 'count' should give a more
accurate lighting (at the cost of a longer render). The lighting should still
be smooth, not splotchy. There has to be some bug somewhere...

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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> There has to be some bug somewhere...

Hunt it down and kill it, Warp. We believe in you! :)

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Kari Kivisalo <ray### [at] engineercom> wrote:
:>   By the way, if anyone is interested in the scene, I can put it somewhere
:> to download.

: That would be nice. The download didn't work for me and I got
: some CSS errors and blank pages.

  Ok, you can download it at:

http://www.cs.tut.fi/~warp/sibenik/sibenik_pov.zip

(2477379 bytes)

  By the way, here is the result of the 23.5-hours render:

http://www.cs.tut.fi/~warp/sibenik/sibenik3.jpg

  It looks quite "dirty". Should I submit it or not? I think that it may not
be worthy.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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Judging from the angle between cathedrale and the "sun", it should be
midday.
But in this case the church interior seems too dark.
There should also be much more contrast.
Since yesterday I try to do the same model, but it seems very difficult to
get really realistic results.
Architecture of gothic and romanic cathedrals are a hobby of mine, therefore
I might be prejudiced...

Norbert


"Warp" <war### [at] tagpovrayorg> schrieb im Newsbeitrag
news:3c1a63e8@news.povray.org...

>   By the way, here is the result of the 23.5-hours render:
>
> http://www.cs.tut.fi/~warp/sibenik/sibenik3.jpg
>
>   It looks quite "dirty". Should I submit it or not? I think that it may
not
> be worthy.

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Norbert Kern <nor### [at] t-onlinede> wrote:
: But in this case the church interior seems too dark.

  It would be really easy to lighten it up. However, I don't want to spend
other 24 hours to render it again...

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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>   It would be really easy to lighten it up. However, I don't want to spend
> other 24 hours to render it again...

i like it darker - looks more moody - i would submit it


--

Rick

Kitty5 WebDesign - http://Kitty5.com
POV-Ray News & Resources - http://Povray.co.uk
TEL : +44 (01270) 501101 - FAX : +44 (01270) 251105 - ICQ : 15776037

PGP Public Key
http://pgpkeys.mit.edu:11371/pks/lookup?op=get&search=0x231E1CEA

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Warp wrote:
>
> http://www.cs.tut.fi/~warp/sibenik/sibenik_pov.zip

Thanks. I should be really working like, right now!, but I just
have to try this :)


_____________
Kari Kivisalo

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Here is my 1st try with the simulation just to see if
it would benefit from tonal range modification. Maybe
later.

The white sources were replaced by realistic colors and
intensities for sun and sky. I used diffuse 0.6 for the
linearised sandstone texture maps and diffuse 0.8 for the
floor. Other textures were diffuse 0.6. I assumed the maps
to be sRGB.

http://www.pp.htv.fi/kkivisal/church1.jpg

Took 25 minutes on 1GHz AMD without the glass objects.

global_settings{
  assumed_gamma 1.0
  radiosity{
    pretrace_start 0.04
    pretrace_end 2/400
    count 200
    recursion_limit 2
    nearest_count 3
    error_bound 0.5
  }
}

_____________
Kari Kivisalo

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It's looking good.

  What are those white artifacts near the center of the image?

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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