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From: Peter Houston
Subject: Superellipsoids & Orthographic Camera - Bug ?
Date: 16 May 2000 05:55:44
Message: <39211b20@news.povray.org>
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I believe there is a bug in the POV-Ray code, it is evident when you view a
superellipsoid with an orthographic camera and rotate it y*90 ( refer to
image in p.b.i and code in p.t.s-f)
I have noticed that it happens in Official 3.1g (Windows), MegaPov 0.4 and
MegaPOV 0.5
Regards,
Peter H.
--
____________________________________________________________________
___ _ _ _______
| _ \ || | Peter Houston Houston Graphics 3D Sketch Pad |__ / \
| _/ __ | http://welcome.to/HoustonGraphics |_ \ |) |
|_| |_||_| ICQ# 8770407 Latest Update : 11 May 2000 |___/___/
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In article <39211b20@news.povray.org>, "Peter Houston"
<hou### [at] iname com> wrote:
> I believe there is a bug in the POV-Ray code, it is evident when you
> view a superellipsoid with an orthographic camera and rotate it y*90
> ( refer to image in p.b.i and code in p.t.s-f)
>
> I have noticed that it happens in Official 3.1g (Windows), MegaPov
> 0.4 and MegaPOV 0.5
This might be the problem:
camera {...
location <0.0, 0, -10>
...
look_at <0.0, 0.0, 0.0>
...
}
I seem to remember there being precision problems with cameras pointed
along an axis...I could be wrong though. Anyway, try moving the camera
slightly.
--
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/
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Chris Huff wrote:
> This might be the problem:
> camera {...
> location <0.0, 0, -10>
> ...
> look_at <0.0, 0.0, 0.0>
> ...
> }
>
> I seem to remember there being precision problems with cameras pointed
> along an axis...I could be wrong though. Anyway, try moving the camera
> slightly.
There are no problems with the example above. This will usualy cause
Pov to freak out though -
camera {
location <0,0,0>
look_at <0,-1,0>
}
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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From: Peter Houston
Subject: Re: Superellipsoids & Orthographic Camera - Bug ?
Date: 17 May 2000 06:46:05
Message: <3922786d@news.povray.org>
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I changed location to < 0 , 0.000000001 , -10 > and it worked fine.
Should it still be reported as a bug, as it only happens with a rotation
about y ?
Regards,
Peter H.
> This might be the problem:
> camera {...
> location <0.0, 0, -10>
> ...
> look_at <0.0, 0.0, 0.0>
> ...
> }
>
> I seem to remember there being precision problems with cameras pointed
> along an axis...I could be wrong though. Anyway, try moving the camera
> slightly.
Post a reply to this message
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On Tue, 16 May 2000 21:29:28 -0500, Chris Huff
<chr### [at] yahoocom> wrote:
>I seem to remember there being precision problems with cameras pointed
>along an axis...I could be wrong though. Anyway, try moving the camera
>slightly.
This only holds true if the direction vector is parallel to the y
axis. However I am pretty certain that what we're seeing here is a
precision problem related to the bounding scheme and the fact that it
only manifests itself with the orthographic camera.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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