Mesh.uv

説明

ベースとなるテクスチャの座標

using UnityEngine;
using System.Collections;

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.uv = uvs;
    }
}