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plot 2-dimention sphere in 3-D space

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jia
jia 2024-7-5
回答： Benjamin Kraus 2024-8-14
How can quickly obtain the 3D lattice in matlab for many datas that the lattice is ball.
I know the scatter3 can quickly plot points in 3D space, but i want to get the ball rather than point, and if i use the 'surf' and 'for' loop, the run time is large!
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William Rose
William Rose 2024-7-5
编辑：William Rose 2024-7-5
@jia,
Use sphere() with appropriate values and offsets, as demontrrated in the examples. But it does use surf().
And see this answer from Walter Roberson which does not use surf().
https://www.mathworks.com/matlabcentral/answers/254961-3d-plot-points-as-spheres-instead-of-dots#answer_199956

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Benjamin Kraus
Benjamin Kraus 2024-8-14
Ran in:
I wonder if what you are looking for is the alphaShape command. Check out the documentation and see if it satisfies your requirements.
Specifically, one example is titled Alpha Shape from 3-D Point Cloud, which I've copied here:
[x1,y1,z1] = sphere(24);
x1 = x1(:);
y1 = y1(:);
z1 = z1(:);
x2 = x1+5;
P = [x1 y1 z1; x2 y1 z1];
P = unique(P,'rows');
plot3(P(:,1),P(:,2),P(:,3),'.')
axis equal
grid on
shp = alphaShape(P(:,1),P(:,2),P(:,3),1);
plot(shp)
axis equal

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