MATLAB: Regrid isosurfaces to 2D arrays

isosurfacepatchregrid

Hi all,

I'm using isosurface to extract an isosurface from a 3D array (I'm providing x,y,z,v and the value of the isosurface that I'm looking for).

After I get the isosurface, I would like to create a gridded 2D array and plot the z values of the isosurface using pcolor (providing x_iso, y_iso, z_iso).

I'm basically trying to do the opposite of what surf does.

I can plot the isosurface, but I don't know how to create the 2D gridded array.

Does anyone know how to do this?

Thanks, Mattia

Best Answer

[x,y,z,v] = flow;
p = isosurface(x,y,z,v,-3);
x = p.vertices(:,1) ;
y = p.vertices(:,2) ;
z = p.vertices(:,3) ;
tri = p.faces ;
trisurf(tri,x,y,z) ;

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clc;
x=[-50 -50 50 50 -50];
y=[-50 50 50 -50 -50];
plot(x,y,'black');
axis([-60 60 -60 60]);
hold on;
x=[-25 -25 25 25 -25];
y=[-12.5 12.5 12.5 -12.5 -12.5];
p = patch('XData',x,'YData',y,'FaceColor','white');
pt2 = [1 1 1];
time_instants = 250;
for i=1:1:1000
    % right to left
    right_max = 50 - max(x);
    left_max = -50 - min(x);
    for t=linspace(right_max, left_max, time_instants)
        p.Vertices(:,1) = x' + t;
        drawnow
    end
    pt2=pt2+[-0.125 0.125 0];
    x = x*pt2(1);
    y = y*pt2(2);
    p.Vertices(:,2) = y;
    
    % left to right
    right_max = 50 - max(x);
    left_max = -50 - min(x);
    for t=linspace(left_max, right_max, time_instants)
        p.Vertices(:,1) = x' + t;
        drawnow
    end
    pt2=pt2+[-0.125 0.125 0];
    x = x*pt2(1);
    y = y*pt2(2);
    p.Vertices(:,2) = y;
end

Best Answer

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