Collision mesh won't form until mesh is moved?

I'm trying to use this(http://wiki.unity3d.com/index.php/MarchingSquares) script for a procedural 2d asteroid, and for whatever reason it creates the collision mesh, but won't form it until after I've moved it. Doesn't matter whether or not I move it in script or in the editor, but the collision mesh won't form. I'm still trying to wrap my head around building meshes procedurally, but I can't seem to figure out what I'm missing.

         // render
         // for the sake of simplicity we are rendering every frame.
         // obviously you should only render when the data of the cells has changed
         Mesh mesh, cmesh;
         MarchSquares(out mesh, out cmesh, ref cells, 0.5f);
         // update the render mesh
         mf = (MeshFilter) Testg.GetComponent(typeof(MeshFilter));
         mf.mesh.Clear();
         mf.mesh.vertices = mesh.vertices;
         mf.mesh.uv = mesh.uv;
         mf.mesh.triangles = mesh.triangles;
         mf.mesh.normals = mesh.normals;
         Destroy(mesh);
         // update the collision mesh
         MeshFilter cmf = (MeshFilter) TestRenderg.GetComponent(typeof(MeshFilter));
         cmf.mesh.Clear();
         cmf.mesh.vertices = cmesh.vertices;
         cmf.mesh.uv = cmesh.uv;
         cmf.mesh.triangles = cmesh.triangles;
         cmf.mesh.normals = cmesh.normals;
         Destroy(cmesh);
         mc = (MeshCollider) Testg.GetComponent(typeof(MeshCollider));
         if (mc != null)
             mc.sharedMesh = mf.mesh;
         
         Vector3 temp = Testg.transform.position;
         temp.y += 1;
         Testg.transform.position = temp;
     }
  
     public void FixedUpdate() {
         // render
         // for the sake of simplicity we are rendering every frame.
         // obviously you should only render when the data of the cells has changed
         Mesh mesh, cmesh;
         MarchSquares(out mesh, out cmesh, ref cells, 0.5f);
         // update the render mesh
         MeshFilter mf = (MeshFilter) Testg.GetComponent(typeof(MeshFilter));
         mf.mesh.Clear();
         mf.mesh.vertices = mesh.vertices;
         mf.mesh.uv = mesh.uv;
         mf.mesh.triangles = mesh.triangles;
         mf.mesh.normals = mesh.normals;
         Destroy(mesh);
         // update the collision mesh
         MeshFilter cmf = (MeshFilter) TestRenderg.GetComponent(typeof(MeshFilter));
         cmf.mesh.Clear();
         cmf.mesh.vertices = cmesh.vertices;
         cmf.mesh.uv = cmesh.uv;
         cmf.mesh.triangles = cmesh.triangles;
         cmf.mesh.normals = cmesh.normals;
         Destroy(cmesh);
         MeshCollider mc = (MeshCollider) Testg.GetComponent(typeof(MeshCollider));
         if (mc != null)
             mc.sharedMesh = mf.mesh;
     }