by placing a few lines beside each other laugh

f.e.:
You place a line straight downwards from

0,0,0 -> 0,0,-100

to give this line a strenght of 3:

0,0,0 -> 0,0,-100
1,0,0 -> 1,0,-100
-1,0,0 -> -1,0,-100

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>> click here if you are interested <<