using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class GenerateMesh : MonoBehaviour ｛
   static Color color = new Color(255, 0, 0, 255);
    Vector3[] vertices = new Vector3[4];
    Color[] colors = ｛ color, color, color, color ｝;
    Vector2[] uvs = ｛ new Vector2(0, 0), new Vector2(0, 1), new Vector2(1, 1), new Vector2(1, 0) ｝;
    int[] tris = ｛ 0, 1, 2, 0, 2, 3 ｝;
    void Start ()
    ｛
        GameObject gameObject = new GameObject("Quad");
        gameObject.transform.SetParent(transform, false);
        var mf = gameObject.AddComponent<MeshFilter>();
        var mr = gameObject.AddComponent<MeshRenderer>();
        vertices[0] = new Vector3(0, 0, 0);
        vertices[1] = new Vector3(0, 1, 0);
        vertices[2] = new Vector3(1, 1, 0);
        vertices[3] = new Vector3(1, 0, 0);
        Material mat = new Material(Shader.Find("Custom/SurfaceShader"));
        Mesh mesh = new Mesh();
        mesh.vertices = vertices;
        mesh.colors = colors;
        mesh.uv = uvs;
        mesh.triangles = tris;
        mf.mesh = mesh;
        mr.material = mat;
    ｝
｝