Mesh.uv2

var uv2 : Vector2[]

Description

The second texture coordinate set of the mesh, if present.

JavaScript
// Generate planar uv coordinates for the secondary uv set

function Start () {
var mesh : Mesh = GetComponent(MeshFilter).mesh;
var vertices : Vector3[] = mesh.vertices;
var uvs : Vector2[] = new Vector2[vertices.Length];

for (var i = 0 ; i < uvs.Length; i++)
uvs[i] = Vector2 (vertices[i].x, vertices[i].z);

mesh.uv2 = uvs;
}