### Highlights from Surface Curvature

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# Surface Curvature

### Daniel Claxton (view profile)

23 May 2006 (Updated )

Vectorized surface curvature computation

File Information
Description

[K,H,P1,P2] = surfature(X,Y,Z) returns the gaussian curvature of a surface (K), mean curvature (H), and principal curvatures (P1,P2). The inputs (X,Y,Z) are 2D arrays corresponding to the surface being analyzed.

Example
[X,Y,Z] = peaks;
[K,H,P1,P2] = surfature(X,Y,Z);
surf(X,Y,Z,H,'facecolor','interp');
set(gca,'clim',[-1,1])

MATLAB release MATLAB 7 (R14)
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Comments and Ratings (22)
28 May 2015 Thomas Atta-Fosu

### Thomas Atta-Fosu (view profile)

Perfect!

29 Apr 2015 Hongli Yang

### Hongli Yang (view profile)

29 Apr 2015 Hongli Yang

### Hongli Yang (view profile)

try to contact author, but email expired
do someone knows what the sign here means, for each point, the curvature could be positive or negative. If we want to have a mean curvature of the whole surface, should we consider the sign or not?

27 Oct 2014 Othmani

### Othmani (view profile)

I am trying to run the code with 3D data but I gets this problem :
Error in ==> gradient at 49
[msg,f,ndim,loc,rflag] = parse_inputs(f,varargin);

??? Output argument "varargout{2}" (and maybe others) not assigned during call to "C:\Program

Error in ==> surfature at 11

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30 Jun 2014 abuzer

### abuzer (view profile)

thank you for code however it does not run for 3D data and the error occured.

Error in gradient (line 49)
[err,f,ndim,loc,rflag] = parse_inputs(f,varargin);

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06 Mar 2014 dong

### dong (view profile)

03 Mar 2014 Ahmad

### Ahmad (view profile)

this is that I want i.e. all types of curvature.
BUT(!) I have a point cloud that every point have x,y&z(3D coordinate).
Can I calculate curvature of each point?
If yes then how?
thank U

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22 Nov 2013 Daniel

### Daniel (view profile)

23 Jul 2013 Caitlin

### Caitlin (view profile)

I am also wondering what the 2D input arrays corresponding to the surface are?

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08 Apr 2013 soudeh

### soudeh (view profile)

Thank you for your code,
I am trying to obtain the principal curvatures (K1,K2) for each voxels(x,y,z) of a 3d image that has an intensity value. These values are calculated based on Gaussian and mean curvatures . How can I use your code in order to get my results.

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03 Dec 2012 bnu

### bnu (view profile)

very good,thanks a lot!!

31 May 2011 vinu arasu

### vinu arasu (view profile)

Could you please explain what is 2D arrays corresponding to the surface being analyzed??

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14 Sep 2010 Lucas Lorensi

### Lucas Lorensi (view profile)

Excellent! Is there a way to compute principal directions?

29 Apr 2010 Ted Teng

### Ted Teng (view profile)

By definition, H>0 for convex surface, so it seems negative Z corresponding to convex?

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20 Nov 2009 Jason Zhang

### Jason Zhang (view profile)

Cool, see how it works!

27 Jun 2008 krog babuz'

Hi, could you please specify what the 2D arrays for X,Y,Z actually are?

20 May 2008 Su Ping

cool, I'm looking for this

26 Dec 2007 ewe wewe
24 Jul 2007 Giancanio Sileo

Very good tool for curvature computation.

10 Jul 2007 Michael Girard

COOL

07 Feb 2007 mustafa yagci
31 May 2006 Tao Ye

i've been trying to find code to perform some computational geometry tasks, this one is very much helpful. Thank you.