How to find the closest point outside a collider from a point inside the collider.

Question

I'm trying to figure out how to reposition a transform that is inside a object with a collider to the nearest position just outside of the collider.

I have been trying to use these 3 methods I've found:

         //Method 1
         Vector3 closestPoint = avoidanceObject.GetComponent<Collider>().ClosestPoint(target.transform.position);

         //Method 2
         Vector3 closestPointInBounds = avoidanceObject.GetComponent<Collider>().ClosestPointOnBounds(target.transform.position);

         //Method 3
         Vector3 pos = target.transform.position;
         Quaternion rot = target.transform.rotation;
         Vector3 closestPointCollider = Physics.ClosestPoint(target.transform.position, target.GetComponent<Collider>(), pos, rot);

         target.transform.position = closestPointCollider;

These three methods do not change the position, is it because the transform is inside the collider? If so how would I find the nearest point or direction to move outside of the collider?

Thank you!

Answer 1

You can try with "Physics.OverlapSphere"

I use a code like this to detect an enemy inside of the radius of a bomb explosion:

 public float radius = 200f;
 
 void Explosion()
     {   
         Collider[] colliders = Physics.OverlapSphere(transform.position, radius);
         foreach(Collider enemy in colliders)
         {
             if(enemy.CompareTag("Enemy"))
             {
                 EnemyBehaviour exploded = enemy.GetComponent<EnemyBehaviour>();
                 exploded.DestroyedByBomb();
                 Destroy(gameObject);
             }
         }
     }
 }

and you can Make something like this:

 public float radius = 200f;
 public GameObject yourObject;
 
 public void DetectNewPosition()
     {   
         Collider[] colliders = Physics.OverlapSphere(transform.position, radius);
         foreach(Collider newPos in colliders)
         {
             if(newPos.CompareTag("NearestPoint"))
             {
                 yourObject.transform.Position = newPos.transform.Position;
             }
         }
     }
 }

This requires that your "Nearest Point" object have a collider and a tag "NearestPoint"

Another option is to use "OnCollisionEnter" like this:

 public GameObject yourObject;
 
 private void OnCollisionEnter(Collision collision1)
     {
         //Debug.Log("Colision");
         if (collision1.collider.tag == "NearestPoint")
         {
             NewPos();
         }
         
         void NewPos()
         {
             ContactPoint contact = collision1.GetContact(0); //contacts[0];
             Quaternion qua = Quaternion.FromToRotation(Vector3.up, contact.normal);
             Vector3 pos = contact.point;
 
             yourObject.transform.position = pos;
             yourObject.transform.rotation = qua;
         }
     }

How to find the closest point outside a collider from a point inside the collider.

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