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hello!
i tested a little bit superellipsoids. with the following code i got a
funny pattern on it. does anybody know why?
-------------------------
superellipsoid{
<0.25,0.0001>
pigment{Gray}
scale 0.25
rotate y*-20
translate <0,0.5,0.5>
}
-------------------------
thanks.
Post a reply to this message
Attachments:
Download 'ellipsoid.jpg' (14 KB)
Preview of image 'ellipsoid.jpg'
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marabou wrote:
>
> hello!
>
> i tested a little bit superellipsoids. with the following code i got a
> funny pattern on it. does anybody know why?
>
> -------------------------
> superellipsoid{
> <0.25,0.0001>
> pigment{Gray}
> scale 0.25
> rotate y*-20
> translate <0,0.5,0.5>
> }
>
> -------------------------
i forgot to say: if i take the following parameters the pattern is not
there:
superellipsoid{
<0.25,0.001>
Post a reply to this message
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It seems to me that POV-Ray 3.5 doesn't like numbers that small. That
confused me since I'm used to using numbers such as .00000001 to avoid
coincident surfaces. But I'm curious as to why it's so sensitive now. It
seems to round real small numbers down to zero or something.
--
- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]
"marabou" <not### [at] available yet> wrote in message
news:3bbcba8d@news.povray.org...
> marabou wrote:
>
> >
> > hello!
> >
> > i tested a little bit superellipsoids. with the following code i got a
> > funny pattern on it. does anybody know why?
> >
> > -------------------------
> > superellipsoid{
> > <0.25,0.0001>
> > pigment{Gray}
> > scale 0.25
> > rotate y*-20
> > translate <0,0.5,0.5>
> > }
> >
> > -------------------------
>
> i forgot to say: if i take the following parameters the pattern is not
> there:
>
> superellipsoid{
> <0.25,0.001>
Post a reply to this message
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It looks like you could almost make a Union Jack with that =)
- Nekar
"marabou" <not### [at] availableyet> wrote in message news:3bbcb8e9@news.povray.org...
>
> hello!
>
> i tested a little bit superellipsoids. with the following code i got a
> funny pattern on it. does anybody know why?
>
> -------------------------
> superellipsoid{
> <0.25,0.0001>
> pigment{Gray}
> scale 0.25
> rotate y*-20
> translate <0,0.5,0.5>
> }
>
> -------------------------
>
> thanks.
Post a reply to this message
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Slime wrote:
> It seems to me that POV-Ray 3.5 doesn't like numbers that small. That
> confused me since I'm used to using numbers such as .00000001 to avoid
> coincident surfaces. But I'm curious as to why it's so sensitive now. It
> seems to round real small numbers down to zero or something.
nice to know that this (problem?) exists in 3.5, too. i used 3.1g.
Post a reply to this message
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marabou wrote:
>
> hello!
>
> i tested a little bit superellipsoids. with the following code i got a
> funny pattern on it. does anybody know why?
>
> -------------------------
> superellipsoid{
> <0.25,0.0001>
Know problem of 3.1 (at least the union jack illumination)
I made a proposal to solve that problem, a long time ago.
If you can read french,
read http://jgrimbert.free.fr/pov/correct/superellipsoid.html
(otherwise, you can still look at the pictures)
Post a reply to this message
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>
> Know problem of 3.1 (at least the union jack illumination)
> I made a proposal to solve that problem, a long time ago.
>
> If you can read french,
> read http://jgrimbert.free.fr/pov/correct/superellipsoid.html
> (otherwise, you can still look at the pictures)
i can not read french, but the hint is great.
about the mesh site is there an english version? or an equivalent site?
Post a reply to this message
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marabou wrote:
>
> i can not read french, but the hint is great.
> about the mesh site is there an english version? or an equivalent site?
Try 'bable fish' at Altavista: http://www.altavista.com/
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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From: Christoph Hormann
Subject: Re: superellipsoidtest - failed? =part II=
Date: 5 Oct 2001 08:17:43
Message: <3BBDA5BB.89BC5922@gmx.de>
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marabou wrote:
>
> nice to know that this (problem?) exists in 3.5, too. i used 3.1g.
Oh, just to mention, it does *not* occur in Povray 3.5 (although there are
still artefacts with these parameters).
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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Heh, funny, because I never noticed any problem with tiny numbers in version
3.1. Ah, well.
--
- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]
"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3BBDA5BB.89BC5922@gmx.de...
>
>
> marabou wrote:
> >
> > nice to know that this (problem?) exists in 3.5, too. i used 3.1g.
>
> Oh, just to mention, it does *not* occur in Povray 3.5 (although there are
> still artefacts with these parameters).
>
> Christoph
>
> --
> Christoph Hormann <chr### [at] gmxde>
> IsoWood include, radiosity tutorial, TransSkin and other
> things on: http://www.schunter.etc.tu-bs.de/~chris/
Post a reply to this message
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