Full surface from scatter by griddata!!!

3 views (last 30 days)
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1. 0. 0. ];
x = A(:,1);
y = A(:,2);
z = A(:,3);
[xq,yq] = meshgrid(0:.01:1);
vq = griddata(x,y,z,xq,yq,'linear');
mesh(xq,yq,vq)
hold on
scatter3(x,y,z,'filled')
view(135,45)
This is picture I get: (Figure 1)
This is picture I want to get:(Figure 2)
The line above is code I try to run full surface but I only get (figure(1)) The edge in bottom do not have. So how can i get Full surface like this from this code. Any other solution in this case??? Thank you.

Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 10 Jun 2022
Edited: Bjorn Gustavsson on 10 Jun 2022
This is "just" a pixellation-problem. You can see how it comes about by varying the resolution of your grid:
[xq,yq] = meshgrid(0:.001:1);
vq = griddata(x,y,z,xq,yq,'linear');
subplot(2,2,1)
surf(xq,yq,vq),shading flat
view(0,90)
hold on
scatter3(x,y,z,8,'r','filled')
subplot(2,2,2)
[xq,yq] = meshgrid(0:.01:1);
vq = griddata(x,y,z,xq,yq,'linear');
surf(xq,yq,vq),shading flat
view(0,90)
hold on
scatter3(x,y,z,8,'r','filled')
subplot(2,2,3)
[xq,yq] = meshgrid(0:.1:1);
vq = griddata(x,y,z,xq,yq,'linear');
surf(xq,yq,vq),shading flat
view(0,90)
hold on
scatter3(x,y,z,8,'r','filled')
Alternatively you could use trisurf:
tri = delaunay(x,y);
tr = triangulation(tri, x(:), y(:), z(:));
subplot(2,2,4)
trisurf(tr)
view(0,90)
shading flat
HTH
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