Editor-only class for defining a collision polygon in 3D space. Allows editing a collision polygon's vertices on a selected plane. Can also set a depth perpendicular to that plane. This class is only available in the editor. It will not appear in the scene tree at run-time. Creates a [Shape] for gameplay. Properties modified during gameplay will have no effect. Length that the resulting collision extends in either direction perpendicular to its polygon. If [code]true[/code], no collision will be produced. The collision margin for the generated [Shape]. See [member Shape.margin] for more details. Array of vertices which define the polygon. [b]Note:[/b] The returned value is a copy of the original. Methods which mutate the size or properties of the return value will not impact the original polygon. To change properties of the polygon, assign it to a temporary variable and make changes before reassigning the [code]polygon[/code] member.