Collision Detection

There are two requirements before detect the collision:

• Both of the items should have Collider Component;
• The relative moving object need to add rigid body.

Step 1: Add the Box Collider on the Rock

Step 2: Add the Capsule Collider and Rigid Body on the projectile

Step 3: Write code to control the effect of collision and drag it on Rock

Note: OnTriggerEnter() is a function that can detect the collision. It also can get which object conflicts the object. So, the collider must check the Trigger attribute and set its unique tag.

Step 4: Run the game

  

Another way to detect collision: Do not check Trigger attributes and use OnCollisionEnter() function.

function OnCollisionEnter(collision:Collision){

    if(collision.gameObject.tag=="plane"){

        Destroy(gameObject);

    }

}

The difference between these two methods:

the collider with trigger can enter into the other object while it only conflict at the edge without trigger.