Collisions and Triggers

Chapter 13

What are the Collider Components?

• Box

• Sphere

• Capsule

• Mesh - matches shape of a 3D model but expensive

What is the Collision Detection Process?

• Checks collisions every FixedUpdate()

• At lesat one object needs an RB

• Both objects need a collider

• Considers velocity, mass, and materials

What are the collision triggers?

• OnCollisionEnter - when contact begins

• OnCollisionStay - while still touching

• OnCollisionExit - when separated

What is the Trigger Detection process?

• Colliders that have Is Trigger set to true

• Once object must have an RB

• No physical response

What are the Trigger events?

• OnTriggerEnter - when entering the trigger zone

• OnTriggerStay - when staying inside

• OnTriggerExit - when exiting the zone

What is the Physics Players and Collision Matrix?

• Allow grouping of GameObjects

• Found in: Edit > Project Settings > Physics

• Use gameObject.layer in code to assign layers dynamically