Unity/UGUI底层绘制原理

UnityDraw.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class UnityDraw : MonoBehaviour
{
    public Texture2D TestTexture;//测试用贴图
    void Start()
    {
        Vector3[] vertices = new Vector3[4];//设置顶点
        vertices[0] = Vector3.zero;
        vertices[1] = new Vector3(0, 0, 1);
        vertices[2] = new Vector3(1, 0, 1);
        vertices[3] = new Vector3(1, 0, 0);

        int[] triangles = new int[6];//设置三角面
        triangles[0] = 0;
        triangles[1] = 1;
        triangles[2] = 2;
        triangles[3] = 2;
        triangles[4] = 3;
        triangles[5] = 0;

        Vector2[] uv = new Vector2[4];//设置uv
        uv[0] = new Vector2(0, 0);
        uv[1] = new Vector2(1, 0);
        uv[2] = new Vector2(1, 1);
        uv[3] = new Vector2(0, 1);

        Mesh mesh = new Mesh();
        mesh.vertices = vertices;
        mesh.triangles = triangles;
        mesh.uv = uv;
        mesh.Recalc