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From: Ravi on 17 Jun 2010 01:25
Hi,

I just wanted to point out that MATLAB isosurface function has a lot of problems for complex data.

I have created a program that renders exact error-free surfaces from 3-D voxel data, such as from MRI, CT Scan.

The following is the link to the discussion thread

http://www.mathworks.com/matlabcentral/newsreader/view_thread/268226#755017

You can download the program from

http://www.hermesacademy.com/products

Ravi


"lingli " <lizhu(a)cc.hut.fi> wrote in message <hip8uk$lb6$1(a)fred.mathworks.com>...
> Hi all,
> I need your help. I have a problem with the use of 'isosurface' function. In this function,we have to know the volume data. Now I have a 3D array (20000,3). They are 3D points in x,y,z. My problem is from these 3D points how can I calculate the volume data(v). Here are the codes:
> x=data(:,1);y=data(:,2);z=data(:,3);%x =[20000,1], y=[20000,1],z =[20000,1]
> v = ?
> [X,Y,Z]=meshgrid(min(x):500:max(x),min(y):500:max(y),min(z):500:max(z));
> w=griddata3(x,y,z,v,X,Y,Z);
> fv= isosurface(X,Y,Z,V,isovalue);%isovalue is a number between min(V) and max(V)
> figure(1),patch(x,y,z,c); %maybe c=z
> figure(2),patch(fv);
> %The purpose is to compare the result of these two figures.
> Thanks a lot!
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