An arbitrary number of starting lines (red) are written:

#declare starting_lines =
array[4]{
  array[2]{ <-1,-1,-1>, <-1,-1,1> }
  array[2]{ <-1,1,-1>,  <-1,1,1>  }
  array[2]{ <1,-1,-1>,  <1,-1,1>  }
  array[2]{ <1,1,-1>,   <1,1,1>   }
}

And then it will build a webby structure between them.

Sam

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