Hello Martin,
As per my understanding, you are trying to plot a 3D Point Cloud using MATLAB. You want to create a plot in 3D rather than 2D.
Instead of directly manipulating the 3D points (as done in your code), you can make use of the MATLAB "pointCloud" object to simplify the same. In addition to that, you can use the "pctransform" function to do the relevant transformations on the point cloud data (as done in your code). And, you can also use the "pcshow" function to plot the point cloud in a 3D space. Please refer to the following example code:
% Read data from .txt file
data = readmatrix("data.txt");
% Create Point Cloud object from the point matrix
ptCloud = pointCloud(data);
% Create a transformation object (e.g. 45 degree rotation along the z-axis)
rotationAngles = [0 0 45];
translation = [0 0 0];
tform = rigidtform3d(rotationAngles,translation);
% Transform the point cloud
ptCloudOut = pctransform(ptCloud,tform);
% Plot the transformed point cloud
figure
pcshow(ptCloudOut)
xlabel('X')
ylabel('Y')
zlabel('Z')
Please refer to the following documentations on the functions used for more information on the same:
