POV-Ray: Newsgroups: povray.newusers: how to model a ribbon

POV-Ray : Newsgroups : povray.newusers : how to model a ribbon		Server Time 5 Sep 2024 18:16:39 EDT (-0400)

From: Matthias Rarey
Subject: how to model a ribbon
Date: 4 Nov 1999 05:19:16
Message: <38215D5C.3F5F45AF@gmd.de>

Hi,

I started interfacing Povray to my 3D viewer and I really

enjoy it! Most objects are quite easy to build with CSG

except one: a ribbon in 3D space.

What I would like to do is using a prism but instead of

giving two heights, I would like to use 3D spline to sweep

the shape along a defined curve.

Is there an easy way to model such an object in Povray?

Thanks in advance for any help.

Matthias

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From: Ken
Subject: Re: how to model a ribbon
Date: 4 Nov 1999 05:22:33
Message: <38215D1F.50A8904B@pacbell.net>

Matthias Rarey wrote:
> 
> Hi,
> 
> I started interfacing Povray to my 3D viewer and I really
> 
> enjoy it! Most objects are quite easy to build with CSG
> 
> except one: a ribbon in 3D space.
> 
> What I would like to do is using a prism but instead of
> 
> giving two heights, I would like to use 3D spline to sweep
> 
> the shape along a defined curve.
> 
> Is there an easy way to model such an object in Povray?
> 
> Thanks in advance for any help.
> 
> Matthias

Check this out: http://members.xoom.com/dvarrazzo/epov.htm

-- 
Ken Tyler -  1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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From: Nieminen Juha
Subject: Re: how to model a ribbon
Date: 4 Nov 1999 07:59:39
Message: <3821833b@news.povray.org>

Bicubic patches may be the answer.
  If you don't know how to make them by hand, use a modeller like spatch.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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From: Ken
Subject: Re: how to model a ribbon
Date: 4 Nov 1999 16:16:04
Message: <3821F75F.1DD009C9@pacbell.net>

Matthias Rarey wrote:
> 
> Hi,
> 
> I started interfacing Povray to my 3D viewer and I really
> 
> enjoy it! Most objects are quite easy to build with CSG
> 
> except one: a ribbon in 3D space.

See also: http://povobjects.virtualave.net/cgi-bin/objlist.cgi?/others/

-- 
Ken Tyler -  1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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From: Steve Strickland
Subject: Re: how to model a ribbon
Date: 4 Nov 1999 23:51:33
Message: <38226454.81EEF249@puzzlecraft.com>

Matthias Rarey wrote:

> Hi,
>
> I started interfacing Povray to my 3D viewer and I really
>
> enjoy it! Most objects are quite easy to build with CSG
>
> except one: a ribbon in 3D space.
>
> What I would like to do is using a prism but instead of
>
> giving two heights, I would like to use 3D spline to sweep
>
> the shape along a defined curve.
>
> Is there an easy way to model such an object in Povray?
>
> Thanks in advance for any help.
>
> Matthias



Chris Colefax's Spline macro would do this quite nicely.

Steve

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