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based on an earlier version of the Wolfram Language.
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OpenTruncate

OpenTruncate[expr]
truncates each edge of each polygon in graphics expression expr without filling in with a polygon.
OpenTruncate[expr, ratio]
truncates to the specified ratio of the edge length.
  • OpenTruncate[expr] uses a truncation ratio of 3/10.
  • ratio must be between 0 and 1/2.