5.4 Introduction to 2D Physics

Physics adds realism to your 2D game.

Step 1: Rigidbody2D and Colliders2D

Add a Rigidbody2D for dynamic physics (e.g., gravity, collisions).

Use BoxCollider2D, CircleCollider2D, or PolygonCollider2D to define shapes for collision detection.

Step 2: Physics Materials

Use 2D physics materials to adjust friction and bounciness.

Apply a material to your Collider2D to create unique interactions (e.g., slippery ice or bouncy platforms).

Step 3: Triggers

Mark a collider as a trigger to detect overlaps without physical collision.

Use triggers for collectibles, hazards, or checkpoints:

void OnTriggerEnter2D(Collider2D collision) {
    if (collision.CompareTag("Collectible")) {
        Debug.Log("Item Collected!");
        Destroy(collision.gameObject);
    }
}

Activity: Add physics-based platforms and collectibles to your level.