Javascript - Detect wall collision and flip

Question

I have a wall and a sprite. I want the sprite to flip and face the other direction once it hits the wall.

I tried this:

 function OnTriggerEnter(sprite: Collider){    
     if(sprite.gameObject.tag == "wall"){
         transform.Rotate (Vector3.up * 180);
     }
 }

Only thing the sprite does is push the wall away rather than flip. Please help!

Answer 1

Not sure about you using 2D, but anyway, you could try this :

(Warning: it's in Boo, but you could port it)

     def OnCollisionEnter(collision as Collision):
         for contact as ContactPoint in collision.contacts:
             tag="wall"
             if contact.thisCollider.CompareTag(tag) or \
                contact.otherCollider.CompareTag(tag):
                 flip=true

If you're only looking for forward collisions,

     def OnCollisionEnter(collision as Collision):
         for contact as ContactPoint in collision.contacts:
             tag="wall"
             if Vector3.Dot(self.transform.forward, contact.normal)>=0.7:
                 flip=true

The flipping code could be a lerp so it looks smoother though.

 rotation=self.transform.rotation
 rotation.eulerangles.y+=180
 if flip:
     self.transform.rotation=Quaternion.Lerp(
                             self.transform.rotation, 
                             rotation, 
                             60*Time.deltaTime)
 
 #Rotates at 60 degrees per second.

Javascript - Detect wall collision and flip

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