POV-Ray : Newsgroups : povray.binaries.images : Strange artifact in isosurface landscape Server Time
2 Aug 2024 18:12:42 EDT (-0400)
  Strange artifact in isosurface landscape (Message 1 to 5 of 5)  
From: Jörg 'Yadgar' Bleimann
Subject: Strange artifact in isosurface landscape
Date: 30 May 2007 07:02:34
Message: <465d59ca@news.povray.org>
High!

When rendering several views of a simple isosurface landscape (with 
hetero_mf being used as main function), a strange effect occured: 
shadows are cut by straight lines like indicated by the red arrows in 
the attached picture. I remember having read about this problem here 
several months before here, perhaps even in 2006, but I couldn't find 
the respective posting...

Is there a way to fix this?

See you on www.khyberspace.de !

Yadgar

Now playing: Don't Work That Hard (Scritti Politti)


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Attachments:
Download 'ghurghusht_flat_0027b_looking_southwest_arrows.jpg' (76 KB)

Preview of image 'ghurghusht_flat_0027b_looking_southwest_arrows.jpg'
ghurghusht_flat_0027b_looking_southwest_arrows.jpg


 

From: Joerg
Subject: Re: Strange artifact in isosurface landscape
Date: 30 May 2007 07:39:38
Message: <465d627a$1@news.povray.org>
do you have the double_illuminate keyword with your object?

have a look here:
http://www.povray.org/documentation/view/3.6.1/329/

I once had similar problems with some heightfields and could fix it using
double_illuminate

Regards
Joerg



> High!
> 
> When rendering several views of a simple isosurface landscape (with 
> hetero_mf being used as main function), a strange effect occured: 
> shadows are cut by straight lines like indicated by the red arrows in 
> the attached picture. I remember having read about this problem here 
> several months before here, perhaps even in 2006, but I couldn't find 
> the respective posting...
> 
> Is there a way to fix this?
> 
> See you on www.khyberspace.de !
> 
> Yadgar
> 
> Now playing: Don't Work That Hard (Scritti Politti)
> 
> ------------------------------------------------------------------------
>


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From: Jörg 'Yadgar' Bleimann
Subject: Re: Strange artifact in isosurface landscape
Date: 30 May 2007 08:44:36
Message: <465d71b4@news.povray.org>
High!

Joerg schrieb:
> do you have the double_illuminate keyword with your object?

Not yet - but I will try it out! Thank you for the tip!

See you on www.khyberspace.de !

Yadgar

Now playing: Falling Angel (Alphaville)


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From: Christian Froeschlin
Subject: Re: Strange artifact in isosurface landscape
Date: 30 May 2007 11:10:20
Message: <465d93dc@news.povray.org>
> When rendering several views of a simple isosurface landscape (with 
> hetero_mf being used as main function), a strange effect occured: 
> shadows are cut by straight lines like indicated by the red arrows in 
> the attached picture.

Looks like these lines are present in the geometry itself.
Maybe reposition the camera to check it out.


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From: def gsus-
Subject: Re: Strange artifact in isosurface landscape
Date: 30 May 2007 17:25:02
Message: <web.465deb178fca644cbd61fc7e0@news.povray.org>
according to the shadows of the spheres the lightsource is relatively low.
so it looks quite normal to me. the straight lines seem to come from the
isosurface's function.


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