Segment Collider

The SegmentCollider defines a line segment between two points. It is useful for thin walls, one-way platforms, and invisible barriers that don’t need volumetric shape.

Properties

Property	Type	Default	Description
point1	Vec2	{x: -0.5, y: 0}	Start point in physics units (local space)
point2	Vec2	{x: 0.5, y: 0}	End point in physics units (local space)
density	number	1.0	Mass density
friction	number	0.6	Surface friction
restitution	number	0.0	Bounciness
isSensor	boolean	false	Trigger zone without physical response
categoryBits	number	1	Collision filter category bits

Usage

Add a SegmentCollider component to any entity that also has a RigidBody and Transform.

Thin walls: Create invisible collision boundaries without using a full box shape.

commands.spawn(
    Transform.default(),
    RigidBody.with({ bodyType: 0 }),
    SegmentCollider.with({
        point1: { x: 0, y: 0 },
        point2: { x: 0, y: 5 },
    }),
);

One-way platforms: Combine with static body type to create edges that objects can land on.

Invisible barriers: Define play area boundaries without visible collider geometry.

Note

Segment colliders are single-sided. For two-sided collision boundaries, consider using a thin BoxCollider or a ChainCollider instead.

See Also

• Colliders Overview — all collider types
• Chain Collider — chain of connected segments for terrain
• Polygon Collider — convex polygon shapes