Defines a 2D collision polygon. Provides a 2D collision polygon to a [CollisionObject2D] parent. Polygon can be drawn in the editor or specified by a list of vertices. Collision build mode. Use one of the [code]BUILD_*[/code] 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 polygon's list of vertices. The final point will be connected to the first. The returned value is a clone of the PoolVector2Array, not a reference. Collisions will include the polygon and its contained area. Collisions will only include the polygon edges.