Hi,

I did some experiments on procedural wood texture and here is the 
resulting image (I used glass from Jaime Vives Piqueres website).

I got problem ("coincident surface like" bug) when I tried to 
incorporate some information onto the image using "screen.inc" and 
particularly the Screen_Plane macro. Here is the original macro:

#macro Screen_Plane (Texture, Scaling, BLCorner, TRCorner)
    box {
       <-0.000001,-0.000001,0>, <+1.000001,+1.000001,0>
    ...

This is basically a box with no thickness. Is that intended or is my 
file somehow out of date ?

Anyway, I had to slightly modify it to get clean color bands:

#macro Screen_Plane (Texture, Scaling, BLCorner, TRCorner)
    box {
       <-0.000001,-0.000001,0>, <+1.000001,+1.000001,0.000001>
    ...


I can post image sources if anyone interested.


Nico

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Attachments:
Download 'glass.jpg' (106 KB)

Preview of image 'glass.jpg'

Nico wrote:
> 
> #macro Screen_Plane (Texture, Scaling, BLCorner, TRCorner)
>    box {
>       <-0.000001,-0.000001,0>, <+1.000001,+1.000001,0>
>    ...
> 
> This is basically a box with no thickness. Is that intended or is my 
> file somehow out of date ?

This is intended and works without problems.  If you make the thickness 
non-zero you will have two 'planes'.

> 
> I can post image sources if anyone interested.

The wood would be interesting.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 25 Oct. 2003 _____./\/^>_*_<^\/\.______

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Hi,

Very nice wood ! I love those warm colors ..
(sorry never used screen.inc so i can't help)

M

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> I can post image sources if anyone interested.

I'd like to see the source for your good looking wood material.

Severi Salminen

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But when I render the screen.pov example file I get the attached image.
I used povray 3.5 under linux with following command:
povray +Iscreen.pov +w640 +h480 +P

I posted the sources for wood to povray.text.scene-files

Nico

Christoph Hormann wrote:
> Nico wrote:
> 
>>
>> #macro Screen_Plane (Texture, Scaling, BLCorner, TRCorner)
>>    box {
>>       <-0.000001,-0.000001,0>, <+1.000001,+1.000001,0>
>>    ...
>>
>> This is basically a box with no thickness. Is that intended or is my 
>> file somehow out of date ?
> 
> 
> This is intended and works without problems.  If you make the thickness 
> non-zero you will have two 'planes'.
> 
>>
>> I can post image sources if anyone interested.
> 
> 
> The wood would be interesting.
> 
> Christoph
>

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Attachments:
Download 'screen.jpg' (57 KB)

Preview of image 'screen.jpg'

Using such a box is quite strange IMHO (but there might be a reason for it
?)..
Try replacing it with a simple mesh with two triangles, something like

 mesh {
     triangle { <0,0,0>, <1,0,0>, <1,1,0> }
     triangle { <0,0,0>, <0,1,0>, <1,1,0> }

(not tested)

M

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Nico wrote:
> 
> But when I render the screen.pov example file I get the attached image.
> I used povray 3.5 under linux with following command:
> povray +Iscreen.pov +w640 +h480 +P

Do you use the official version?  I don't get this effect here.

> I posted the sources for wood to povray.text.scene-files

Thanks.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 25 Oct. 2003 _____./\/^>_*_<^\/\.______

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I get sources from povray site and compiled them on Mandrake 9.1 so it's 
not really The official version but I did not tweak it either (just 
compile it).
Strangely enough, I do not get the bug using windows and windows 
official binaries so it's certainly related to my compilation environment.

Does anyonbe else got the bug under linux ?

Nico


Christoph Hormann wrote:
> Nico wrote:
> 
>>
>> But when I render the screen.pov example file I get the attached image.
>> I used povray 3.5 under linux with following command:
>> povray +Iscreen.pov +w640 +h480 +P
> 
> 
> Do you use the official version?  I don't get this effect here.
> 
>> I posted the sources for wood to povray.text.scene-files
> 
> 
> Thanks.
> 
> Christoph
>

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Nico wrote:
> 
> I get sources from povray site and compiled them on Mandrake 9.1 so it's 
> not really The official version but I did not tweak it either (just 
> compile it).
> Strangely enough, I do not get the bug using windows and windows 
> official binaries so it's certainly related to my compilation environment.

Please specify which compiler you are using (gcc version).  You should 
also try compiling without optimization.  If this is a bug it almost 
certainly is one of gcc and not of POV-Ray.

The obvious fix is of course to use the official binary.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 25 Oct. 2003 _____./\/^>_*_<^\/\.______

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I just tested the official linux binary and I still got the bug.

Hardware is:
Dell Precision 360

System is:
Mandrake Linux release 9.2 (FiveStar) for i586
Kernel 2.4.22-10mdkenterprise on an i686

Nico


Christoph Hormann wrote:
> Nico wrote:
> 
>>
>> I get sources from povray site and compiled them on Mandrake 9.1 so 
>> it's not really The official version but I did not tweak it either 
>> (just compile it).
>> Strangely enough, I do not get the bug using windows and windows 
>> official binaries so it's certainly related to my compilation 
>> environment.
> 
> 
> Please specify which compiler you are using (gcc version).  You should 
> also try compiling without optimization.  If this is a bug it almost 
> certainly is one of gcc and not of POV-Ray.
> 
> The obvious fix is of course to use the official binary.
> 
> Christoph
>

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