Man page - stl_borders(1)
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Manual
STL_BORDERS
NAMEDESCRIPTION
NAME
stl_borders - stl_borders prints how many border edges there are in a given STL file.
DESCRIPTION
stl_borders prints how many border edges there are in a given STL file.
usage: stl_borders [ <input file> ]
Prints how many border edges there are. For a watertight, manifold model, it will be 0.