RE: [Algorithms] Heightfield to NURBS conversion

[Martin F. <mf...@ac...>]

This really is a very very complex problem to attempt to solve, I don't know
of any algorithms or programs that do this.
What I would suggest instead is using a curve equation that interpolates all
the control points. (But will break the convex hull)
One such spline it the Catmull Rom spline, information about which can be
found here.

http://graphics.cs.ucdavis.edu/CAGDNotes/Catmull-Rom-Spline/Catmull-Rom-Spli
ne.html

Using Catmull Rom splines in certainly much easier (and quicker) than
dealing with NURBS.
Hope this helps, :)
Cheers,
Martin


-----Original Message-----
From: Christian R. M. Koerber
[mailto:chr...@pu...]
Sent: 06 September 2000 02:05
To: gda...@li...
Subject: Re: [Algorithms] Heightfield to NURBS conversion


"Christian R. M. Koerber" wrote:

> 
> I have a question too:
> 
> Could anyone of you point me to an algorithm on heightfield

actually I meant 'easy, ready to use algorithm'


> to NURBS conversion i.e an algorithm which takes as input
> an heightfield and returns the control points of the NURBS-
> surface which APPROXIMATES the heightfield to a user given
> error?
> I'd really like to avoid meddling with the later chapters
> of Piegl & Tillers NURBS book! Maybe you even know a pro-
> gram?
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