Make I something wrong or is this bug?
Rendered picture in beta-test.binaries.
-------------------------------------------------

#version 3.5;

#include "colors.inc"

global_settings {
  assumed_gamma 1.5
}

// ----------------------------------------

camera {
  location  <-1.0, 3.5, -4.0>
  direction 1.5*z
  right     x*image_width/image_height
  look_at   <0.0, 0.0,  0.0>
}


light_source {
  <1, 7.5, -8>
  color rgb <1, 1, 1>
}

// ----------------------------------------

plane {
  y, -1.5
  texture {
    pigment {
      marble
      color_map {

        [0.0  color rgb < 1,   1,   1   > ]
        [0.33 color rgb < 0,   0.5, 1   > ]
        [0.67 color rgb < 0,   1,   0.5 > ]
        [1.0  color rgb < 1,   1,   1   > ]
      }
      turbulence 0.3
      scale 4
    }
    finish { ambient 0.5 specular 0.6 }
  }
}

#declare f3 = function {
                  pigment{
                     crackle
                     turbulence 0
                     color_map { [0 rgb 1] [1 rgb 0] }
                  }
              }

isosurface {
 function { abs( - z - f3(x,y,z).gray*0.0 ) - 0.01 }
 // see also
 // function { z }
 // function { abs(y)-0.01 }
 threshold 0
 max_gradient 2
 contained_by {box {<-1.2,-1.2,-1.2>, < 1.2, 1.2, 1.2>}}
 texture {
          pigment { color rgbt <1,0,0,0.8> }
   finish {ambient 1 diffuse 0.6}
 }
}


Gabriel
--------
Kon### [at] GGnatowskide

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In article <3c065976@news.povray.org> , "Gabriel" <Kon### [at] GGnatowskide> 
wrote:

> Make I something wrong or is this bug?
> Rendered picture in beta-test.binaries.

It would help if you would explain where to look for "something wrong" in
the picture and you expect it to look.

    Thorsten

PS: In the future, please post images in JPEG (preferred) or PNG format.

____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg

I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

There is really something strange.

- f3(x,y,z).gray*0.0 is supposed to be always 0 and therefore should not
effect the isosurface at all, no? But it does influence the isosurface.

In addition (and perhaps the problem the original author meant), the
turbulated marble plane shows up as using no turbulence in the pigment
statement while seen through the isosurface (container?). Lowering the
accuracy-value seems not to have any effect 8tryed 0.0001. But by removing
the turbulence in the marble pigment, everything renders as expected.

Perhaps it's related to the marble + turbulence bug reported as fixed in the
next beta?

Marc-Hendrik

PII 450, 128 MB, Win 98, Pov 3.5 beta 7

Thorsten Froehlich schrieb in Nachricht <3c0662db@news.povray.org>...
>In article <3c065976@news.povray.org> , "Gabriel" <Kon### [at] GGnatowskide>
>wrote:
>
>> Make I something wrong or is this bug?
>> Rendered picture in beta-test.binaries.
>
>It would help if you would explain where to look for "something wrong" in
>the picture and you expect it to look.
>
>    Thorsten
>
>PS: In the future, please post images in JPEG (preferred) or PNG format.
>
>____________________________________________________
>Thorsten Froehlich
>e-mail: mac### [at] povrayorg
>
>I am a member of the POV-Ray Team.
>Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

In article <3c0688b6@news.povray.org> , "Marc-Hendrik Bremer" 
<Mar### [at] t-onlinede> wrote:

> Perhaps it's related to the marble + turbulence bug reported as fixed in the
> next beta?

Yes, but I don't understand what the isosurface has to do with marble.  As
far as I can tell the isosurface doesn't use marbel, so where am I supposed
to look for a problem?  In the marble plane or the isosurface?  If it is in
the marble plane, why is there an isosurface in the scene?

See, I need to know what effect is supposed to be there and what is wrong
with the current output in order to even know what I am supposed to fix, if
anything at all...

    Thorsten

____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg

I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

Wait a minute (I should have, before I posted my last message, but you will
be used to this already :o})

While it's still strange what happens when f3*0 is involved, I could bring
up the turbulated marble by lowering the accuracy-value even more.
Probably the f3*0-problem is also resolvable by really high settings for
max_gradient and a sufficent small container. It's strange anyway, cause one
would not suspect accuracy problems when multiplying by zero, nor should
this increase the max_gradients.

Marc-Hendrik

Marc-Hendrik Bremer schrieb in Nachricht <3c0688b6@news.povray.org>...
>There is really something strange.
>
>- f3(x,y,z).gray*0.0 is supposed to be always 0 and therefore should not
>effect the isosurface at all, no? But it does influence the isosurface.
>
>In addition (and perhaps the problem the original author meant), the
>turbulated marble plane shows up as using no turbulence in the pigment
>statement while seen through the isosurface (container?). Lowering the
>accuracy-value seems not to have any effect 8tryed 0.0001. But by removing
>the turbulence in the marble pigment, everything renders as expected.
>
>Perhaps it's related to the marble + turbulence bug reported as fixed in
the
>next beta?
>
>Marc-Hendrik
>
>PII 450, 128 MB, Win 98, Pov 3.5 beta 7

Post a reply to this message

Thorsten Froehlich schrieb in Nachricht <3c068cd1@news.povray.org>...
>In article <3c0688b6@news.povray.org> , "Marc-Hendrik Bremer"
><Mar### [at] t-onlinede> wrote:
>
>> Perhaps it's related to the marble + turbulence bug reported as fixed in
the
>> next beta?
>
>Yes, but I don't understand what the isosurface has to do with marble.  As
>far as I can tell the isosurface doesn't use marbel, so where am I supposed
>to look for a problem?  In the marble plane or the isosurface?  If it is in
>the marble plane, why is there an isosurface in the scene?
>

The Iso on it's own has nothing to do wth the marble. It's just that looking
through the translucent Iso shows the turbulated pattern on the plane as if
it's not turbulated. Checker or gradient y does not behave that way.

In addition, the container-object is visible in that it shows the
unturbulated marble, too, but in a blocky way.

The first problem is partly resolveable by a low accuracy and removing the
f3(x,y,z)*0-part. But even with very low settings, you don't get the "real"
turbulated marble-pattern, but something which seems to be sized down.
The second one (visible container) keeps poping up but with max_gradient
20000 and a smaler Container in the z-direction, it begins to show
someturbulence, too.

>See, I need to know what effect is supposed to be there and what is wrong
>with the current output in order to even know what I am supposed to fix, if
>anything at all...


Yep, that's clear. I thought, I wrote something sufficient in my first post.
Obviously not. Hope this one is better. I, too, just try to find out what
happens.

Marc-Hendrik

Post a reply to this message

In article <3c069692@news.povray.org> , "Marc-Hendrik Bremer" 
<Mar### [at] t-onlinede> wrote:

> The first problem is partly resolveable by a low accuracy and removing the
> f3(x,y,z)*0-part. But even with very low settings, you don't get the "real"
> turbulated marble-pattern, but something which seems to be sized down.
> The second one (visible container) keeps poping up but with max_gradient
> 20000 and a smaler Container in the z-direction, it begins to show
> someturbulence, too.

Ah, I think I know what you are up too:  The idea is that when looking
through the isosurface the pattern looks wrong?

If so, lets indeed wait for the next beta, as I am not sure what was fixed
regarding marble...

    Thorsten

____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg

I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

Thorsten Froehlich schrieb in Nachricht <3c06ad12@news.povray.org>...

>Ah, I think I know what you are up too:  The idea is that when looking
>through the isosurface the pattern looks wrong?


Yes, that's my idea. I don't know if this is what the original poster had in
mind, though.

>
>If so, lets indeed wait for the next beta, as I am not sure what was fixed
>regarding marble...


Ok, it's not that long anyway :-)

Marc-Hendrik

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