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Question by burzum793 · Sep 06, 2013 at 03:04 AM · collisionanglerigidbody-collision

How do I get the angle of the collision?

This code works fine and bounces the projectile, but I would like to know the angle of the projectile to the point/surface it hit so that I can conditionally check if it will really bounce off or penetrate the material. So a projectile that hits the surface in a low angle wont penetrate.

 void OnCollisionEnter(Collision collision) {
     this.rigidbody.velocity = Vector3.Reflect(this.transform.position, collision.contacts[0].normal);
 }

Any suggestions how to get this done?

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Answer by aldonaletto · Sep 06, 2013 at 03:17 AM

Are you sure that this code works fine? It should be:

 void OnCollisionEnter(Collision collision) {
     rigidbody.velocity = Vector3.Reflect(rigidbody.velocity, collision.contacts[0].normal);
 }

Anyway, you could measure the angle between the velocity and the normal like this:

 public float maxAngle = 95; 

 void OnCollisionEnter(Collision collision){
     Vector3 normal = collision.contacts[0].normal;
     Vector3 vel = rigidbody.velocity;
     // measure angle
     if (Vector3.Angle(vel, -normal) > maxAngle){
         // bullet bounces off the surface
         rigidbody.velocity = Vector3.Reflect(vel, normal);
     } else {
         // bullet penetrates the target - apply damage...
         Destroy(gameObject); // and destroy the bullet
     }
  }

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