POV-Ray : Newsgroups : povray.binaries.images : Nine bicubic patches, one image Server Time
17 Aug 2024 08:18:46 EDT (-0400)
  Nine bicubic patches, one image (Message 1 to 3 of 3)  
From: Josh English
Subject: Nine bicubic patches, one image
Date: 30 Oct 2001 12:38:14
Message: <3BDEE578.7AFB817@spiritone.com>
The dragon image is left over from a wedding invitation I worked on few
years ago. The image is mapped onto nine smoothly connected bicubic
patches using a macro I've been working on this weekend.

This is all coded in POV-Ray, no modelers used.

There is a description of how I did this at
http://www.spiritone.com/~english/cyclopedia/patches.html

Josh English
eng### [at] spiritonecom


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dragon.jpg


 

From: ARTis
Subject: Re: Nine bicubic patches, one image
Date: 30 Oct 2001 15:14:12
Message: <3bdf0a14@news.povray.org>
> The dragon image is left over from a wedding invitation I worked on few
> years ago. The image is mapped onto nine smoothly connected bicubic
> patches using a macro I've been working on this weekend.
>
> This is all coded in POV-Ray, no modelers used.

where do those two blue lines come from? a problem in your macro?


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From: Josh English
Subject: Re: Nine bicubic patches, one image
Date: 30 Oct 2001 16:27:30
Message: <3BDF1B12.1892838E@spiritone.com>
ARTis wrote:
> 
> > The dragon image is left over from a wedding invitation I worked on few
> > years ago. The image is mapped onto nine smoothly connected bicubic
> > patches using a macro I've been working on this weekend.
> >
> > This is all coded in POV-Ray, no modelers used.
> 
> where do those two blue lines come from? a problem in your macro?

Nope. They are places where this is a break in the bicubic patch. Some
patches can show these artifacts on the diagonals and the horizontal and
vertical centers. Both of these lines occur on the vertical centerlines
of patches.

Here is the same thing, but I've moved a few control points to reduce
the effects, and I've drawn in the edges of the patches.

Josh English
eng### [at] spiritonecom


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Preview of image 'dragon2.jpg'
dragon2.jpg


 

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