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I want to fit lines to the 3D points seen in the photo and get its shape But I do not know how to do it. please guide me. The points file is available.

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Accepted Answer

darova
darova on 17 Sep 2021
SOmething is wrong with the data you attached
s = importdata('POINT.txt');
x = s(:,1);
y = s(:,2);
z = s(:,3);
plot3(x,y,z,'.-r')
  4 Comments
adel hosseini
adel hosseini on 28 Sep 2021
Thank you in advance for your help
Do you mean that?
clc;
clear;
close all;
S = importdata('POINT2.txt');
x = S(:,1);
y = S(:,2);
z = S(:,3);
points1 = length(S);
randLoc1=randi(points1);
randPoint1(1,:)=S(randLoc1,1:3);
xr=randPoint1(1,1);
yr=randPoint1(1,2);
zr=randPoint1(1,3);
findrand=find(S(:,1)==xr & S(:,3)==zr);
leangthafindrand = size(findrand,1);
class{1}(1:leangthafindrand,:)=S(findrand,1:3);
leangthclass=size(class{1},1);
S(S(:,1)==xr & S(:,3)==zr,:)=[];
x1 = S(:,1);
y1 = S(:,2);
z1 = S(:,3);
plot(xr,zr,'.r','marker','o')
hold on
plot(x1,z1,'.b')
points2 = length(S);
minDis=0;
m=0;
k=1;
while points2>0
m=m+1;
minDis=0;
while minDis<0.8 && points2>0
for i=1:1:points2(1,1);
dis{k}(i)=abs(sqrt((x1(i)-xr)^2 + (z1(i)-zr)^2));
end
minDis=min(dis{k});
aa=find(dis{k}(:)==minDis);
hold on
plot(x1(aa),z1(aa),'.y','marker','o')
leangtha = size(aa,1);
p=leangthclass+leangtha;
class{m}(leangthclass+1:p,:)=S(aa,1:3);
leangthclass=size(class{m},1);
xr=S(aa(1),1);
yr=S(aa(1),2);
zr=S(aa(1),3);
plot(xr,zr,'.r','marker','o')
axis equal
S(S(:,1)==xr & S(:,3)==zr,:)=[];
x1 = S(:,1);
y1 = S(:,2);
z1 = S(:,3);
points2 = size(S,1);
k=k+1;
end
leangthclass=1;
endclass=class{m}(end,:);
findend=find(class{m}(:,1)==endclass(1,1) & class{m}(:,2)==endclass(1,2) & class{m}(:,3)==endclass(1,3));
class{m+1}(1,:)=class{m}(end,:);
class{m}(findend(:),:)=[];
line(class{m}(:,1),class{m}(:,3),'marker','o','linestyle','-')
end
class{m}(end+1,:)=class{m+1}(1,:);
class{m+1}(:,:)=[];
line(class{m}(:,1),class{m}(:,3),'marker','o','linestyle','-')

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