Segment shape resource for 2D physics. 2D segment shape to be added as a [i]direct[/i] child of a [PhysicsBody2D] or [Area2D] using a [CollisionShape2D] node. Consists of two points, [code]a[/code] and [code]b[/code]. [b]Performance:[/b] Being a primitive collision shape, [SegmentShape2D] is fast to check collisions against (though not as fast as [CircleShape2D]). The segment's first point position. The segment's second point position.