Leo Müller asked . 2022-02-19

How to generate a point cloud in 3D?

Hello dear community,
 
I would like to know if there is a fast way to create a cloud in 3D which consists of points. I would like to get something like this:
 

point cloud in 3D

The points should be written into a simple matrix. Each row should represent one point. Thank you for your help!
 

points , array , cloud , generate , matrix , 3d

Expert Answer

Prashant Kumar answered . 2024-05-19 23:32:43

This might be a good starting point:
 
 
[x,y,z] = ndgrid(1:5:100,1:5:100,1:5:100);
scatter3(x(:),y(:),z(:),'.')

 

point cloud in 3D

The ndgrid function will return multiple arrays of the same shape with one of its inputs replicated along one dimension of each of its outputs.
 
The syntax x(:) says to convert that 3D array into a vector.
 
The scatter3 function takes 3 vectors and plots a marker at the location defined by each row of the three.
 
The '.' argument to scatter3 tells it to draw a dot, rather than one of the bigger and more complex markers.


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