unity-physicscore2d-factories

Create a ragdoll by building capsule bodies for each body part and connecting them with PhysicsHingeJoint joints that have angle limits. Use a negative groupIndex in the contact filter so ragdoll parts never collide with each other.

Arrange capsule bodies in a ring and connect adjacent pairs with PhysicsFixedJoint joints configured with angularFrequency and angularDamping for spring-like compliance. The negative groupIndex filter prevents the ring's own segments from colliding inward.

Create a polygon chassis body and two circle wheel bodies, then attach them with PhysicsWheelJoint definitions enabling a motor, spring suspension (springFrequency and springDamping), and translation limits. Set motorSpeed at runtime to drive the vehicle.

Self-collision happens when body parts share the same collision group. Assign a negative groupIndex in the PhysicsShape.ContactFilter so all parts in that group never collide with each other while still colliding with the world.

Use a factory when an object requires multiple bodies, shapes, and joints created in a coordinated sequence, such as ragdolls, vehicles, or soft bodies. The factory centralizes configuration, returns a struct with a Destroy method, and keeps creation logic reusable and testable.