Thanks you, I felt the same way until I saw this video. I only did the editing of it. Patrick was the talent behind this one.

Doug

I have never understood those things before watching your great tutorial video!!!
I really wish that my prof could explain things the way you did ;)

I am one of your million loyal fan out there, so keep doing those tutorials.
They are just so GREAT!

best regards,
nils

Great idea for checking how code manipulates data, in stages

It seems you are right. I got sloppy with my terms.

Thanks
Doug

As Tom notes, the ISONORMALS command is great to use in conjunction with the ISOSUFACE command. ISONORMALS can make the surface look more continuous by adjusting the ‘VertexNormals’ property of the patch object based on the gradient of the underlying data. In fact, when you call ISOSURFACE without an output argument it makes use of the ISONORMALS command.

In the interest of limiting the total length of this presentation to one hour I had to forgo talking about the nice ISOSURFACE-helpers like ISONORMALS, ISOCAPS, and ISOCOLORS. But please feel free to check them out in the documentation:
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/isonormals.html
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/isocaps.html
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/isocolors.html

The alpha command is useful - I hadn’t come across that, and always struggled with setting facealpha value etc for individual patches.

Also well worth a mention is the isonormals command, which effectively removes the faceted appearance of the patch objects (although gouraud lighting helps, computing the isonormals is still a substantial improvement).

From the ML isonormals help:

data = cat(3, [0 .2 0; 0 .3 0; 0 0 0], ...
              [.1 .2 0; 0 1 0; .2 .7 0],...
              [0 .4 .2; .2 .4 0;.1 .1 0]);
data = interp3(data,3,'cubic');

subplot(1,2,1)
p1 = patch(isosurface(data,.5),...
'FaceColor','red','EdgeColor','none');
view(3); daspect([1,1,1]); axis tight
camlight; camlight(-80,-10); lighting phong;
title('Triangle Normals')

subplot(1,2,2)
p2 = patch(isosurface(data,.5),...
    'FaceColor','red','EdgeColor','none');
isonormals(data,p2)
view(3); daspect([1 1 1]); axis tight
camlight;  camlight(-80,-10); lighting phong;
title('Data Normals')

the error message I get for the first script is:

“??? Error using ==> load
Number of columns on line 1 of ASCII file C:\Documents and Settings\ft20\Desktop\Matlab Scripts for Nirs\Insert
Stim Marks\22-dots_fixed.nirs
must be the same as previous lines.”

and for the second I get:

“??? Error using ==> load
Unable to read file fileName: No such file or directory.”

Thanks,

F

Create the string and then display it at the end. DISP is going to automatically put a line feed carriage return in there.

Doug

Have you tried the procedure with a much smaller dataset to make sure you are doing everything right? If it works with a smaller dataset, then we can take it from there.

Doug