Manipulate Mesh 1

using UnityEngine;
using System.Collections;
public class ChangeMesh : MonoBehaviour {
    //The source object that we will be copying
    //vertex data from
    public GameObject goSource;
    void Start() {
        //Get the mesh of the source object
        Mesh meshObjectsMesh = (Mesh)(goSource.GetComponent().mesh);
        //Create a new mesh that we will assign to this object
        Mesh mesh = new Mesh();
        //Get the vertices from the source object and assign
        //them to the new mesh.
        mesh.vertices = meshObjectsMesh.vertices;
        //Get the uv map from the source object and assign
        //it to the new mesh.
        mesh.uv = meshObjectsMesh.uv;
        //Get the triangles from the source object and assign
        //them to the new mesh.
        mesh.triangles = meshObjectsMesh.triangles;
        //We can ask the engine to recalculate the normals
        //of the mesh, the normals are the surfaces that are rendered.
        mesh.RecalculateNormals();
        //We have to call RecalculateBounds to make sure
        //that the triangles from the vertex relationships
        //are recalculated correctly
        mesh.RecalculateBounds();
        //set the new mesh as the mesh for this object
        GetComponent().mesh = mesh;
    }
}