Mesh Filter Cosmetic Damage

Presently trying to work on a script that allows a ball to take cosmetic mesh damage as it goes through a level. Problem is, Ive been having trouble finding the proper equation for moving the vertexs.

Heres what I have thusfar

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using UnityEngine;
 
 public class MeshDenter : MonoBehaviour {
     Vector3[] originalMesh;
     public float dentFactor;
     public LayerMask collisionMask;
     private MeshFilter meshFilter;
     void Start() {
         meshFilter = GetComponent<MeshFilter>();
         originalMesh = meshFilter.mesh.vertices;
     }
 
     void OnCollisionEnter(Collision collision) {
         Vector3[] meshCoordinates = originalMesh;
         // Loop through collision points
         foreach (ContactPoint point in collision.contacts) {
             // Index with the closest distance to point.
             int lastIndex = 0;
             // Loop through mesh coordinates
             for (int i = 0; i < meshCoordinates.Length; i++) {
                 // Check to see if there is a closer index
                 if (Vector3.Distance(point.point, meshCoordinates[i])
                     < Vector3.Distance(point.point, meshCoordinates[lastIndex])) {
                     // Set the new index
                     lastIndex = i;
                 }
             }
             // Move the vertex
             meshCoordinates[lastIndex] += /*Insert Rest Of Equation Here*/;
         }
         meshFilter.mesh.vertices = meshCoordinates;
     }
 
     void Reset() {
         meshFilter.mesh.vertices = originalMesh;
     }
 }