var mesh1:Mesh = transform.GetComponent(MeshFilter).mesh;
var vertx:Array;
var uvs:Array;
var i;
Debug.Log(mesh1.uv.Length);
vertx = mesh1.vertices;
Debug.Log(mesh1.uv.Length);
uvs = mesh1.uv;
vertx[vertx.length] = Vector3(1,1,1);
vertx[vertx.length] = Vector3(2,1,1);
vertx[vertx.length] = Vector3(2,1,2);
vertx[vertx.length] = Vector3(1,1,2);
mesh1.vertices = vertx;
Debug.Log(uvs.length);
for (i = 0 ; i < 4; i++)
        uvs[uvs.length] = Vector2 (vertx[uvs.length].x, vertx[uvs.length].z);
mesh1.uv = uvs;
mesh1.triangles += [vertx.length-4, vertx.length-3, vertx.length-2, vertx.length-4, vertx.length-2, vertx.length-1];
mesh1.Optimize();
mesh1.RecalculateNormals();
mesh1.RecalculateBounds();
transform.GetComponent(MeshFilter).mesh = mesh1;