'How to line up objects along a drawn line?

I try to do the following: at the bottom of the screen there is a small window for drawing a line, in the center of the screen there are objects that line up in the drawn line

enter image description here

I apologize for my drawings :)

  1. How to make this drawing window?
  2. How to make objects line up in a drawn line? Thanks in advance.
c++sharpunity3d


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