How to generate multiple .stl files in a loop?

My core question is: How to write multiple .stl files.

What I am doing here is: Open a .stl file (Code line 1), then rotate it in randomly generated axis (Code lines: 2 : 16) and finally write 10 .stl files.

When I run my codes, in command window it show 10 files succesfully written, but when I check in directory it shows only 1 file.

I think there is something wrong with the way I am try to use stlread (function) in for loop to write multiple .stl files.

Link1: function used to read .stl file

Link2: function used to write .stl file

[F,V,N] = stlread ('Directory_name:\Model_STL_Binary_0_0_0.stl');  %.stl file location
theta_x = randi ([0,180],10,1);
theta_y = randi ([0,180],10,1);
theta_z = randi ([0,180],10,1);
T = table(theta_x,theta_y,theta_z);
theta_angles =table2array(T);
ax = deg2rad(theta_angles(:,1));
ay = deg2rad(theta_angles(:,2));
az = deg2rad(theta_angles(:,3));
for i= 1:length(theta_angles)
    Rx = [ 1, 0, 0 ; 0, cos(ax(i)), -sin(ax(i)); 0, sin(ax(i)), cos(ax(i))];
    Ry = [ cos(ay(i)), 0, sin(ay(i)) ;0, 1, 0 ; -sin(ay(i)), 0, cos(ay(i)) ];
    Rz = [ cos(az(i)), -sin(az(i)), 0 ; sin(az(i)), cos(az(i)), 0 ; 0, 0, 1 ];
    pointR1 = V*Rx;
    pointR2 = pointR1*Ry;
    pointR3 = pointR2*Rz;
    
    stlwrite('check.stl', F, pointR3(:,1:3));
end

Answer 1

[KSSV]

You are overwriitng the stl files. Always you are using the same name to .stl file. You need to give different filename; check the below addition.

[F,V,N] = stlread ('Directory_name:\Model_STL_Binary_0_0_0.stl');  %.stl file location
theta_x = randi ([0,180],10,1);
theta_y = randi ([0,180],10,1);
theta_z = randi ([0,180],10,1);
T = table(theta_x,theta_y,theta_z);
theta_angles =table2array(T);
ax = deg2rad(theta_angles(:,1));
ay = deg2rad(theta_angles(:,2));
az = deg2rad(theta_angles(:,3));
for i= 1:length(theta_angles)
    Rx = [ 1, 0, 0 ; 0, cos(ax(i)), -sin(ax(i)); 0, sin(ax(i)), cos(ax(i))];
    Ry = [ cos(ay(i)), 0, sin(ay(i)) ;0, 1, 0 ; -sin(ay(i)), 0, cos(ay(i)) ];
    Rz = [ cos(az(i)), -sin(az(i)), 0 ; sin(az(i)), cos(az(i)), 0 ; 0, 0, 1 ];
    pointR1 = V*Rx;
    pointR2 = pointR1*Ry;
    pointR3 = pointR2*Rz;
    filename = strcat('check_',num2str(i),'.stl') ;  % File name based on loop index 
    stlwrite(filename, F, pointR3(:,1:3));
end

[Hasnain Raja Muhammad]

My bad! You are right, I was overwriting the file with same file-name.

Thanks 👍🏻