Add contour to 3d surface plot

I have a 3d surface plot created using surf(x,y,z,c) and I would like to highlight a certain area by either drawing a contour line where each x,y,z triple exceeds a level, or by using a differnet colour in this an (or both)!

The help on contourslice is a bit obscure for me

Thanks

Answer 1

[Wayne King]

Do you want a contour, or a patch()?

[X,Y,Z] = peaks;
surf(X,Y,Z); hold on;
patch(X,Y,4*ones(size(Z)),'green');
view(-20,4);

[Wayne King]

sorry pasted incorrectly at first.

[Julie]

That didn't seem to work at all...

I have being playing wiith subvolume :

[a,b,c,V]=subvolume(X,Y,Z,V,[mx-3,mx,my-3,my,mz-3,mz])

but I get the error 'V must be a 3D array' - which isn't very helpful since I think v is a 3d array, (X, Y,Z = are all 30x30 matrces)

Any thoughts?

[Sean de Wolski]

30x30 is 2d...

30x30x30 would be 3d.

[Sean de Wolski]

You visualize a dimension for each component. x/y can be 1d vectors and you visualize them on a 2d x/y plot. x/y/z are 2d matrices and so you visualize them on a 3d plot.