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Mesh.uv2

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public var uv2: Vector2[];
public Vector2[] uv2;

Description

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

#pragma strict
// 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: int = 0; i < uvs.Length; i++)
		uvs[i] = new Vector2(vertices[i].x, vertices[i].z);
	mesh.uv2 = uvs;
}
// Generate planar uv coordinates for the secondary uv set

using UnityEngine;

public class ExampleClass : MonoBehaviour {

void Start () { Mesh mesh = GetComponent<MeshFilter>().mesh; Vector3[] vertices = mesh.vertices; Vector2[] uvs = new Vector2[vertices.Length];

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

mesh.uv2 = uvs; } }

Note: Texture coordinates have to be modified or created externally from the mesh. In the script example above the uvs is created as a new array. Then the texture coordinates are assigned to that array. Once these are assigned the array is assigned to the Mesh.