SegmentShape(Vector2, Vector2) Constructor
Definition¶
Namespace: Brine2D.Physics
Single line segment in local body space.
One-sided collision: segment shapes only collide with shapes approaching from
the outward normal side. The outward normal is the left-hand perpendicular
of the direction Point1 → Point2 — i.e. rotating (Point2 - Point1)
90° counter-clockwise. Shapes that contact the segment from the opposite (back) side
pass straight through without generating any collision response. This makes segment
shapes useful for one-way platforms and directional blockers, but unsuitable for
closed geometry where back-face hits must be resolved.
Use cases: one-way platforms (horizontal segment, normal pointing up), directional walls, simple ramp surfaces. For smooth multi-segment terrain that avoids ghost collisions at joints, prefer ChainShape, which Box2D handles as a single continuous surface. For a two-sided collidable edge, use a very thin CapsuleShape or a narrow BoxShape.
Static geometry only: dynamic bodies with segment shapes behave unpredictably under rotation and are not supported by Box2D.
public SegmentShape(System.Numerics.Vector2 Point1, System.Numerics.Vector2 Point2);Parameters¶
Point1 System.Numerics.Vector2
Start of the segment in local body space (pixels).
Point2 System.Numerics.Vector2
End of the segment in local body space (pixels).