In this video, I use a simple example (a 2x2 grid) to show one approach to building up a polygonal description array.

A polygonal description array looks something like this:
0 3 4 1 -2 1 4 5 2 -2 3 6 7 4 -2 4 7 8 5 -2

hat tip to Guillaume Laferriere for the Index Array to Select Case technique.

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