3.5 | 2 ratings Rate this file 162 downloads (last 30 days) File Size: 8.16 KB File ID: #14248

GNURBS

by Daniel Claxton

12 Mar 2007 (Updated 20 Nov 2007)

No BSD License

Interactive manipulation of NURBS surface/curve

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File Information

Description

For use with the NURBS toolbox, GNURBS allows the user to have an intuitive manipulation of a NURBS surface/curve via control points.

example:
% Graphically manipulate test surface
gnurbs

MATLAB release

MATLAB 7.3 (R2006b)

Other requirements

NURBS Toolbox http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=312&objectType=file

Tags for This File
Everyone's Tags	approximation, bsplines, gui, interpolation, non uniform ration bsplines, nurbs
Tags I've Applied
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Comments and Ratings (3)
21 Mar 2007	Per Bergström	A professional NURBS program!
21 Aug 2007	Tim Davis	There are some very unstable numerics in this code that need to be fixed. For example, you compute R = inv(M) and then only use R to multiply with T=R*up. Never multiply by the inverse. Use T=M\up instead. In addition, there is a very odd use of "det" to solve a system. det is extremely numerically sensistive and should never be used to solve a system.
27 Sep 2008	Daniel Claxton	Since it's not immediately obvious. It should be mentioned that I updated GNURBS in response to Dr. Davis' comments.

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Updates
20 Nov 2007	Made changes to reflect comments by Dr. Davis as well as improvements to the behavior of object selection within the given axes

Tag Activity for this File
Tag	Applied By	Date/Time
approximation	Daniel Claxton	22 Oct 2008 09:04:06
interpolation	Daniel Claxton	22 Oct 2008 09:04:06
nurbs	Daniel Claxton	22 Oct 2008 09:04:06
non uniform ration bsplines	Daniel Claxton	22 Oct 2008 09:04:06
bsplines	Daniel Claxton	22 Oct 2008 09:04:06
gui	Daniel Claxton	22 Oct 2008 09:04:06

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