What is the best way to store 3D points in a loop

Hi, I have a big collection of 3D points, and I am trying to reorganize them with respect to their position by making planes about a line. So in each loop I get a set of 3D points that I want to save for that specific plane. I need a marker so that when using later I can pull out specific points only instead of the whole set. I tried cat, vertcat but it cannot be used in a loop(atleast I don't know how to). Can anyone help? Thanks

Here is the code

input(around 24,000 set of 3D points in a matrix)

input(centerline from which my planes would be build)

for i=1:64

    for (every 3D point)
         make 2 planes on centerline
    if (point inside plane)
    save point
end

I want to save points with marker for each of 64 planes, so that when I use it later, I can only search in the specific points lying on the plane and not all of them. Thanks