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Difference of two `polyshape`

objects

`polyout = subtract(poly1,poly2)`

`[polyout,shapeID,vertexID] = subtract(poly1,poly2)`

`___ = subtract(poly1,poly2,'KeepCollinearPoints',TF)`

`[`

also returns vertex mapping information from the vertices in
`polyout`

,`shapeID`

,`vertexID`

] = subtract(`poly1`

,`poly2`

)`polyout`

to the vertices in `poly1`

and
`poly2`

. The `subtract`

function only supports
this syntax when `poly1`

and `poly2`

are scalar
`polyshape`

objects.

The `shapeID`

elements identify whether the corresponding vertex
in `polyout`

originated in `poly1`

,
`poly2`

, or was created from the difference.
`vertexID`

maps the vertices of `polyout`

to
the vertices of `poly1`

, `poly2`

, or the
difference.