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Question by IxCloudxI · May 14, 2019 at 12:58 AM · collisioninstantiatemeshmeshcollider

how can I instantiate an object specifically at the intersection of a collider and a mesh

Hi everyone. I would like to instantiate objects (rocks) along a mesh (mountain range). but it has to be only along the points where another objects collider meets the mesh.

my game is in 3D but I have illustrated the problem in 2D below. I want to instantiate the object ONLY where there is intercept points.

the collider will always be perfectly circular.

alt text

samplke.png (41.5 kB)
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Answer by IxCloudxI · May 14, 2019 at 02:45 AM

Since I found the answer, I will post it here for anyone who was curious. unity stores collision points when OnCollisionEnter() is called, through a type called ContactPoint.

 private void OnCollisionEnter(Collision collision)
     {
         if (gameObject.tag == "mountain")
         {
             GameObject rockClone;
             foreach (ContactPoint contact in collision.contacts)
             {
                 rockClone = Instantiate(rockPrefab, contact.point, transform.rotation);
                
             }
         }
     }

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