# How to plot isosurface of for a wide range of values

12 views (last 30 days)
moh mor on 28 Apr 2024
Commented: Mathieu NOE on 28 May 2024 at 17:40
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 on 28 Apr 2024
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 ...?

Mathieu NOE on 29 Apr 2024
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 on 28 May 2024 at 17:40
hello again
problem solved ?

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