Look here :
 http://www.cgtechniques.com/~sibenik/

That guy is setting a GI-engine competition, giving some Roman church
model to render.  POV-Ray is on his list, but nobody has yet
submitted something.  I think that POV-Ray highly deserves its place
in the "contest", so, if some radiosity expert with some time on
his hands (not my case) listens...

Fabien.

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On Wed, 12 Dec 2001 18:31:58 +0100, Fabien Mosen wrote:
> That guy is setting a GI-engine competition, giving some Roman church
> model to render.  POV-Ray is on his list, but nobody has yet
> submitted something.  I think that POV-Ray highly deserves its place
> in the "contest", so, if some radiosity expert with some time on
> his hands (not my case) listens...

I notice that many of the entries are "freestyle."  That seems just 
wrong to me.

-- 
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbf 1}hollow interior{media{emission 3-T}}}#end 
Z(-x-x.2x)camera{location z*-10rotate x*90normal{bumps.02scale.05}}

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Why don't you give it a try?

"Ron Parker" <ron### [at] povrayorg> wrote in message
news:slr### [at] fwicom...
> On Wed, 12 Dec 2001 18:31:58 +0100, Fabien Mosen wrote:
> > That guy is setting a GI-engine competition, giving some Roman church
> > model to render.  POV-Ray is on his list, but nobody has yet
> > submitted something.  I think that POV-Ray highly deserves its place
> > in the "contest", so, if some radiosity expert with some time on
> > his hands (not my case) listens...
>
> I notice that many of the entries are "freestyle."  That seems just
> wrong to me.
>
> --
> #macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z
a-z)R(a
> -z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F
T)merge{
> P(z+a)P(z-a)R(-z-z-x a)pigment{rgbf 1}hollow interior{media{emission
3-T}}}#end
> Z(-x-x.2x)camera{location z*-10rotate x*90normal{bumps.02scale.05}}

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I made an entry. Nothing really fancy, just a quick render.

-- 
#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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On Thu, 13 Dec 2001 11:37:19 +0100, stefkeB wrote:
> Why don't you give it a try?

Because I write better C code than POV code, mostly.

-- 
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbt 1}hollow interior{media{emission T}}finish{
reflection.1}}#end Z(-x-x.2y)Z(-x-x.4x)camera{location z*-10rotate x*90}

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>   I made an entry. Nothing really fancy, just a quick render.

Some important contrast and brightness adjustements could gretly enhance
the image.  Keep in mind that all these so-called "high-end" softwares
have some built-in "exposure" taken into account.

I opened the file in 3DS Viz we have here, but couldn't find a light
source !  Maybe you could guess it by looking at other pictures.
Did you use a sky sphere ?

Fabien.

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fabien <fab### [at] skynetbe> wrote:
: Some important contrast and brightness adjustements could gretly enhance
: the image.

  Please tell me how to enhance contrast in the image. I tried. I failed.

: I opened the file in 3DS Viz we have here, but couldn't find a light
: source !  Maybe you could guess it by looking at other pictures.

  The direction of the light source is well defined in the rules page.

: Did you use a sky sphere ?

background { rgb 1 }

-- 
#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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Warp wrote:
> 
>   Please tell me how to enhance contrast in the image. I tried. I failed.
> 

Most important would be to decrease 'error_bound' in the radiosity
settings, of course you will have to raise 'count' to avoid artefacts and
everything will get much slower.  Another thing that might help is to
reduce recursion_limit to 2, this can lead to better contrasts too.

As a side note, i think this kind of scene is not particularly well suited
for POV-Ray, With procedural textures and CSG instead of meshes the
appearance could be much improved and would suffer less at higher
resolutions (in some of the other renders the mesh facets are really
strongly visible).   

How did you convert it BTW?

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:
: Most important would be to decrease 'error_bound' in the radiosity
: settings, of course you will have to raise 'count' to avoid artefacts and
: everything will get much slower.  Another thing that might help is to
: reduce recursion_limit to 2, this can lead to better contrasts too.

  Reducing the recursion_limit hit the spot (although I realized that before
reading your suggestion). The render time also reduced from 1.5h to 1h.
  I made a second entry which looks much better.

: As a side note, i think this kind of scene is not particularly well suited
: for POV-Ray, With procedural textures and CSG instead of meshes the
: appearance could be much improved and would suffer less at higher
: resolutions (in some of the other renders the mesh facets are really
: strongly visible).   

  Well, speedwise I think that meshes and imagemaps are quite ok. If that
same scene would have made with primitives and procedural textures, the render
time could perfectly be several hours...

: How did you convert it BTW?

  3DWin4 did a damn good job at converting the 3ds file given in the page
to mesh2's (with the original uv-information, of course; without that it would
have been impossible to render the scene).
  As the 3ds file didn't have the actual imagemaps, I had to search and
set the proper images in proper places, but that wasn't too difficult.

-- 
#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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By the way, if anyone is interested in the scene, I can put it somewhere
to download.

-- 
#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 -

Post a reply to this message