How to plot isosurface of for a wide range of values

I wish to plot isosurface of my data, But in a wide range of values. For example, MathWork has introduced the following example for one-value isosurface in its help:

[x,y,z,v] = flow;
p = patch(isosurface(x,y,z,v,-3));
isonormals(x,y,z,v,p)
p.FaceColor = 'red';
p.EdgeColor = 'none';
daspect([1 1 1])
view(3); 
axis tight
camlight 
lighting gouraud

The above example, will plot "flow" data if their "v" values is equal to -3.

What I want to do, is that I want to plot my data like "flow", which their "v" values are higher than -3, not exactly equal to -3.

[Paul]

An isosurface is only defined for a one value. Do you want to show separate plots of different isosurfaces for set of distinct values? Or somehow display multiple isosurfaces for different values on one plot? Or ...?

Answer 1

[Mathieu NOE]

as @Paul suggested, we can define several levels and display them on the same plot

just having some fun with colors and transparency to give an idea of the result

[x,y,z,v] = flow;

k = (-4:1:-1);
figure,
hold on 

for i = 1:numel(k)
    p = patch(isosurface(x,y,z,v,k(i)));
    f = i/numel(k); % fraction number
    isonormals(x,y,z,v,p)
    p.FaceColor = [1 f 1-f];
    p.EdgeColor = 'none';
    p.FaceAlpha = f;
    daspect([1 1 1])
    view(3); 
    axis tight
    camlight 
    lighting gouraud
end

[Mathieu NOE]

hello again

problem solved ?