Extract a sphere out of a cube

Question

Mario 2014-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/152716-extract-a-sphere-out-of-a-cube

评论： Mario 2014-10-23

Hello, I have been working with points with specific distances and angles between them, because this properties are constants I can reproduce a large bulk of points, the problem is that so far I can only generate cuboids. What I need is to extract a sphere of a cube maintaining the location of the points, the easiest way that I can think of is something like define a sphere and cut-off the points outside of it, but I have no idea how to do that, any hint is very welcome.

Thank you

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Answer 1

Michael Haderlein 2014-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/152716-extract-a-sphere-out-of-a-cube#answer_150147

在 MATLAB Online 中打开

Do you mean something like this?

[X,Y,Z]=meshgrid(linspace(0,1,20),linspace(0,1,20),linspace(0,1,20));
x=X(:);y=Y(:);z=Z(:);
rem=((x-.5).^2+(y-.5).^2+(z-.5).^2)>.5^2;
x(rem)=[];y(rem)=[];z(rem)=[];
figure, scatter3(x,y,z)