# union

Union of `polyshape`

objects

## Syntax

## Description

`[`

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

,`shapeID`

,`vertexID`

] = union(`poly1`

,`poly2`

)`polyout`

to the vertices in `poly1`

and
`poly2`

. The `union`

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 union.
`vertexID`

maps the vertices of `polyout`

to
the vertices of `poly1`

, `poly2`

, or the
union.

`___ = union(___,'KeepCollinearPoints',`

specifies whether to keep or remove collinear points in `TF`

)`polyout`

for any of the previous syntaxes.

## Examples

## Input Arguments

## Output Arguments

**Introduced in R2017b**