POV-Ray : Newsgroups : povray.unofficial.patches : Bug in "smooth" height_fields??? Server Time
1 Nov 2024 07:27:39 EDT (-0400)
  Bug in "smooth" height_fields??? (Message 1 to 6 of 6)  
From: Francois Labreque
Subject: Bug in "smooth" height_fields???
Date: 10 Mar 2001 21:20:25
Message: <3AAAE044.41A0BF18@videotron.ca>
See related images in povray.binary.images. 

Are the black splotches a bug in MegaPOV?  They do not show up if I
comment out the "smooth" keyword, and do not show up either with
straight POV-ray and are not related to the slope-dependant texture as I
get the same result with "color rgb <1,0,0>"

-- 
Francois Labreque | And a four year old carelessly banging on a toy
    flabreque     | piano is not only 'music', it's probably the last
        @         | moment of 'artistic purity' they'll ever enjoy
   videotron.ca   | before outside influences start corrupting their
                  | expression.    - Chris R.


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From: Bob H 
Subject: Re: Bug in "smooth" height_fields???
Date: 10 Mar 2001 22:13:57
Message: <3aaaed75@news.povray.org>
It's a known problem, yes.  I'm not knowledgeable as to why it is though.
Something about surface normals inverting and double illuminate maybe?
Oh yeah, there was a double illuminate "bug fix" done in version 0.5, I
looked it up but that's all I know.

Bob H.

"Francois Labreque" <fla### [at] videotronca> wrote in message
news:3AAAE044.41A0BF18@videotron.ca...
> See related images in povray.binary.images.
>
> Are the black splotches a bug in MegaPOV?  They do not show up if I
> comment out the "smooth" keyword, and do not show up either with
> straight POV-ray and are not related to the slope-dependant texture as I
> get the same result with "color rgb <1,0,0>"


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From: Warp
Subject: Re: Bug in "smooth" height_fields???
Date: 10 Mar 2001 23:49:22
Message: <3aab03d2@news.povray.org>
Perhaps it's related to this effect?
http://iki.fi/warp/povVFAQ/TheShadowLineArtifact/

-- 
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););}    /*- Warp -*/


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From: Francois Labreque
Subject: Re: Bug in "smooth" height_fields???
Date: 11 Mar 2001 00:34:27
Message: <3AAB0DBE.A48986B6@videotron.ca>
Warp wrote:
> 
>   Perhaps it's related to this effect?
> http://iki.fi/warp/povVFAQ/TheShadowLineArtifact/
> 

Yup, sure does.  Anyways,  I've moved my mountains further back so it
doesn't show that they're not smooth.


-- 
Francois Labreque | And a four year old carelessly banging on a toy
    flabreque     | piano is not only 'music', it's probably the last
        @         | moment of 'artistic purity' they'll ever enjoy
   videotron.ca   | before outside influences start corrupting their
                  | expression.    - Chris R.


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From: Vahur Krouverk
Subject: Re: Bug in "smooth" height_fields???
Date: 12 Mar 2001 04:59:34
Message: <3AAC9E2D.983E2199@aetec.ee>
"Bob H." wrote:
> 
> It's a known problem, yes.  I'm not knowledgeable as to why it is though.
> Something about surface normals inverting and double illuminate maybe?
> Oh yeah, there was a double illuminate "bug fix" done in version 0.5, I
> looked it up but that's all I know.

There was discussion about this, see "Heightfield smooth problem" in
this group, started 2000-06-13.
To avoid this, add double_illumination keyword to height field.


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From: Francois Labreque
Subject: Re: Bug in "smooth" height_fields???
Date: 12 Mar 2001 07:19:21
Message: <3AACBE21.3A9A47D5@videotron.ca>
Vahur Krouverk wrote:
> 
> "Bob H." wrote:
> >
> > It's a known problem, yes.  I'm not knowledgeable as to why it is though.
> > Something about surface normals inverting and double illuminate maybe?
> > Oh yeah, there was a double illuminate "bug fix" done in version 0.5, I
> > looked it up but that's all I know.
> 
> There was discussion about this, see "Heightfield smooth problem" in
> this group, started 2000-06-13.
> To avoid this, add double_illumination keyword to height field.

It didn't solve it in my case.  I ended up doubling the size of the
.png, moving my hf further away and using distance fog so it doesn't
look jaggy.  

-- 
Francois Labreque | And a four year old carelessly banging on a toy
    flabreque     | piano is not only 'music', it's probably the last
        @         | moment of 'artistic purity' they'll ever enjoy
   videotron.ca   | before outside influences start corrupting their
                  | expression.    - Chris R.


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