create a 3D smoothing with csaps (or similar)

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Alberto Acri 2024-6-7

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https://ww2.mathworks.cn/matlabcentral/answers/2126306-create-a-3d-smoothing-with-csaps-or-similar

评论： Mathieu NOE 2024-6-10

采纳的回答： Mathieu NOE

在 MATLAB Online 中打开

To get a better set of nodes arranged in space as a ‘curve’, how can I improve this code? Could you suggest?

load curve_1
cc = curve_1;  %or curve_2
x = cc(:,1);
y = cc(:,2);
z_min = min(cc(:,3));
z_max = max(cc(:,3));
z = z_min:0.1:z_max;
z = z';
% code
[pp,p] = csaps(z,[x;y]);
val = fnval(pp,z);
figure
plot3(x,y,z);
hold on
plot3(val(1,:),val(2,:),z,'r-')
grid on

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采纳的回答

Mathieu NOE 2024-6-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2126306-create-a-3d-smoothing-with-csaps-or-similar#answer_1468791

在 MATLAB Online 中打开

smoothn.m

hello again !

as your post title is about smoothing, this is what I propose , based on the fex submission :

smoothn - File Exchange - MATLAB Central (mathworks.com)

I attached the function in my answer if it makes your life simpler

now, maybe we should also create some intermediate points with interpolation (will be done just after this first answer)

so the starter :

load curve_1
cc = curve_1;  %or curve_2
% load curve_2
% cc = curve_2;  %or curve_2
x = cc(:,1);
y = cc(:,2);
z = cc(:,3);
% smoothing (if needed)
[zz,s,exitflag] = smoothn({x,y,z},1); 
xn = zz{1};
yn = zz{2};
zn = zz{3};
plot3(x,y,z,'*');
hold on 
plot3(xn,yn,zn);