Misc Destructible Terrain Scripts

BaseDestructibleScript.cs

using UnityEngine;
using System.Collections.Generic;

public class BaseDestructibleScript : MonoBehaviour 
{
    public List<string> tags;
    public PhysicsMaterial2D chunkPhysicsMaterial;

    virtual public void onCollision(GameObject collisionObject)
    {
        ShrinkAndDestroyScript shrinkAndDestroy = gameObject.AddComponent<ShrinkAndDestroyScript>();
        Vector2 velocity = collisionObject.rigidbody2D.velocity;

        gameObject.layer = LayerMask.NameToLayer("Default");
        transform.parent = null;
        rigidbody2D.isKinematic = false;
        rigidbody2D.AddForce(velocity * 100f + Random.insideUnitCircle * 50f);
        rigidbody2D.AddTorque(Random.Range(-1f, 1f) * 50f);
        shrinkAndDestroy.time = 0.5f;
    }

    virtual public void copyFrom(BaseDestructibleScript source)
    {
        tags = source.tags;
        chunkPhysicsMaterial = source.chunkPhysicsMaterial;

        collider2D.sharedMaterial = chunkPhysicsMaterial;
    }
}

TerrainDestructorScript.cs

using UnityEngine;
using System.Collections;

#if UNITY_EDITOR
using UnityEditor;
#endif

public class TerrainDestructorScript : MonoBehaviour 
{
    private int _mask;
    private Collider2D[] _results;

    public float radius = 1f;

    void Start()
    {
        _results = new Collider2D[255];
        _mask = LayerMask.GetMask("DestructibleTerrain");
    }

    void FixedUpdate()
    {
        int numResults = Physics2D.OverlapCircleNonAlloc(transform.position, radius, _results, _mask);

        for (int i = 0; i < numResults; i++)
        {
            BaseDestructibleScript destructibleScript = _results[i].gameObject.GetComponent<BaseDestructibleScript>();

            destructibleScript.onCollision(gameObject);
        }
    }

#if UNITY_EDITOR
    void OnDrawGizmosSelected()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere(transform.position, radius);
    }
#endif
}

Hey. Can you explain how to use your script?