Mesh collider on procedurally generated mesh

Hi,

I'm having a problem assigning my mesh a collider.

I've tweaked the CrumpleMesh scene (from the procedural examples package) and now have a flat plane that, on run time, is deformed by Perlin noise. I can assign the mesh itself a collider but this does not follow the contours of the deformed mesh (e.g. the hills and troughs).

So- in light of the above, what would be the best way of assigning a collider to my mesh after it has been deformed (I imagine I need to add something to the script, but can't quite work out what).

FYI, I'm using the C# version of the script:

 using UnityEngine;
 using System.Collections;
 using Graphics.Tools.Noise;
 using Graphics.Tools.Noise.Primitive;
 using Graphics.Tools.Noise.Filter;
 
 public class CrumpleMesh : MonoBehaviour {
     
     public float scale = 1f;
     public float speed = 0f;
     public bool recalculateNormals = false;
     
     private Vector3[] _baseVertices;
     private IModule3D _noise;
     
     //seed
     private Mesh _mesh;
     static private System.Random _rnd = new System.Random(999);
     
     /// <summary>
     /// 
     /// </summary>
     void Start () {
         _mesh = GetComponent<MeshFilter>().mesh;
     }//end Start
     
     /// <summary>
     /// 
     /// </summary>
     void Update () {
         
         if (_noise == null){
             CreatePrimitive();
         }//end if
         
         if (_baseVertices == null){
             _baseVertices = _mesh.vertices;
         }//end if
         
         Vector3[] vertices = new Vector3[_baseVertices.Length];
         
         float timex = Time.time * speed + 1.2584f;
         float timey = Time.time * speed + 40.6584f;
         float timez = Time.time * speed + 1.6518f;
         
         for (int i = 0; i < vertices.Length; i++){
             
             Vector3 vertex = _baseVertices[i];
                     
             vertex.x += _noise.GetValue(timex + vertex.x, timex + vertex.y, timex + vertex.z) * scale;
             vertex.y += _noise.GetValue(timey + vertex.x, timey + vertex.y, timey + vertex.z) * scale;
             vertex.z += _noise.GetValue(timez + vertex.x, timez + vertex.y, timez + vertex.z) * scale;
             
             vertices[i] = vertex;
             
         }//end for
         
         _mesh.vertices = vertices;
         
         if(recalculateNormals){
             _mesh.RecalculateNormals();
         }//end if
         
         _mesh.RecalculateBounds();
         
     }//end Update
     
     /// <summary>
     /// 
     /// </summary>
     private void CreatePrimitive(){
         
         SimplexPerlin primitive = new SimplexPerlin();
         primitive.Seed = (int)(_rnd.Next() * _rnd.Next());
         
         SinFractal filter = new SinFractal();
         filter.OctaveCount = 10f;
         filter.Primitive3D = primitive;
         
         _noise = primitive;
         
     }//end CreatePrimitive
     
 }//end class

Thank you for any responses.