Defines a 2D collision polygon. Provides a 2D collision polygon to a [CollisionObject2D] parent. Polygons can be drawn in the editor or specified by a list of vertices. Collision build mode. Use one of the [enum BuildMode] constants. If [code]true[/code], no collisions will be detected. If [code]true[/code], only edges that face up, relative to [CollisionPolygon2D]'s rotation, will collide with other objects. The margin used for one-way collision (in pixels). Higher values will make the shape thicker, and work better for colliders that enter the polygon at a high velocity. The polygon's list of vertices. The final point will be connected to the first. The returned value is a clone of the [PackedVector2Array], not a reference. Collisions will include the polygon and its contained area. Collisions will only include the polygon edges.