unity 把网格（mesh）绘制到UI上，可用于小地图

之前有个版本利用navmesh绘制小地图

UGUI利用navmesh绘制小地图

这次使用场景的网格来绘制小地图

实现原理

• 获取mesh的顶点和三角面数据
• 然后通过VertexHelper来进行绘图

工程下载地址

链接：https://pan.baidu.com/s/1jH857JCjAqjsB3RkxaW9jA 
提取码：x0kj 

代码逻辑都比较简单，直接上图先

深紫色是场景网格，灰色是绘制在ui

 

控件代码之前用navmesh有提及过可以看看下面链接

https://blog.csdn.net/SnoopyNa2Co3/article/details/81544071

下面是测试代码

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

public class TestMap : MonoBehaviour
{
    /// <summary>
    /// 绘制控件
    /// </summary>
    public UIPopulateMesh UIPopulateMeshmesh;

    /// <summary>
    /// 场景mesh
    /// </summary>
    public Mesh mesh;

    private void Awake()
    {
        UIPopulateMeshmesh.PopulateMesh += (PopulateMesh);
    }

    void PopulateMesh(VertexHelper vh)
    {
        vh.Clear();
        var vv = System.Array.ConvertAll<Vector3, Vector2>(mesh.vertices, v3 =>
        {
            return new Vector2((v3.x), (v3.z));
        });
        //根据顶点和三角面索引来画
        vh.AddUIVertexStream(new List<UIVertex>(SetVbo(vv, new Vector2(0, 0), Color.grey)), new List<int>(mesh.triangles));
    }
    protected UIVertex[] SetVbo(Vector2[] vertices, Vector2 uv, Color32 color)
    {
        UIVertex[] vbo = new UIVertex[vertices.Length];
        List<Vector2> list = new List<Vector2>();
        for (int i = 0; i < vertices.Length; i++)
        {
            var v = vertices[i];
            var vert = UIVertex.simpleVert;
            vert.color = color;
            vert.position = v;
            vert.uv0 = uv;
            vbo[i] = vert;
        }
        return vbo;
    }
}