POV-Ray: Newsgroups: povray.newusers: random black areas in Heightfield

POV-Ray : Newsgroups : povray.newusers : random black areas in Heightfield		Server Time 4 Sep 2024 16:18:12 EDT (-0400)

From: Justin Smith
Subject: random black areas in Heightfield
Date: 27 Sep 2002 03:45:03
Message: <web.3d940bf0b3165e487e1803970@news.povray.org>

I have this otherwise nice-looking mountain terrain generated by a
height_field I made in Photoshop. The problem is that there are all these
odd black areas scattered around the terrain when it is rendered. It
appears as though it is failing to draw some of the triangular components
of the heightfield. It also appears that this occurs most frequently where
the line of sight from the camera just barely skims the surface of the
terrain. Is there a way around this?

Thanks in advance.

-Justin Smith

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From: Christoph Hormann
Subject: Re: random black areas in Heightfield
Date: 27 Sep 2002 04:28:36
Message: <3D9416B4.B4789A99@gmx.de>

Justin Smith wrote:
> 
> I have this otherwise nice-looking mountain terrain generated by a
> height_field I made in Photoshop. The problem is that there are all these
> odd black areas scattered around the terrain when it is rendered. It
> appears as though it is failing to draw some of the triangular components
> of the heightfield. It also appears that this occurs most frequently where
> the line of sight from the camera just barely skims the surface of the
> terrain. Is there a way around this?

alternatively:

- turn off 'smooth'.
- use 'double_illuminate'
- not use a heightfield.

see: http://www.students.tut.fi/~warp/povQandT/SmoothTriangleArtifact/

Christoph

-- 
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