Defines a 2D collision polygon. Provides a concave or convex 2D collision polygon to a [CollisionObject2D] parent. Polygons can be drawn in the editor or specified by a list of vertices. See also [ConvexPolygonShape2D]. In the editor, a [CollisionPolygon2D] can be generated from a [Sprite2D]'s outline by selecting a [Sprite2D] node, going to the [b]Sprite2D[/b] menu at the top of the 2D editor viewport then choosing [b]Create CollisionPolygon2D Sibling[/b]. 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. [b]Note:[/b] This property has no effect if this [CollisionPolygon2D] is a child of an [Area2D] node. 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.