Unity 通过Mesh网格渲染绘制图形与字体

任何一个模型都是由若干网格面组成，而每一个面又有若干个三角形组成，也就是说，模型是由若干个三角形面组成的（字体和图片也是如此）；为此，下面就和大家介绍下在Unity开发中通过Mesh网格渲染绘制图形和字体的方法。

组成简单模型的组件需要包含以下几个：

MeshImage脚本代码如下：

using UnityEngine;  
using System.Collections;  
public class MeshImage : MonoBehaviour {  
    // Use this for initialization  
    void Start () {  
        MeshRectangle ();  
    }  
    // 创建一个矩形  
    void MeshRectangle()  
    {  
        // 得到网格渲染器对象  
        MeshFilter mFilter = gameObject.GetComponent<MeshFilter> ();  
        MeshRenderer mRen = gameObject.GetComponent<MeshRenderer> ();  
        //矩形的四个顶点坐标  
        Vector3[] vertices = new Vector3[4];  
        vertices [0] = new Vector3 (0, 0, 0);  
        vertices [1] = new Vector3 (5, 0, 0);  
        vertices [2] = new Vector3 (5, 5, 0);  
        vertices [3] = new Vector3 (0, 5, 0);  
        // 三角形顶点索引  
        int[] triangles = new int[]{0, 1, 2, 2, 3, 0};  
        //每个顶点的法线  
        Vector3[] normals = new Vector3[4];  
        normals [0] = new Vector3 (0, 0, -5);  
        normals [1] = new Vector3 (0, 0, -5);  
        normals [2] = new Vector3 (0, 0, -5);  
        normals [3] = new Vector3 (0, 0, -5);  
        //  UV贴图坐标  
        Vector2[] uvs = new Vector2[4];  
        uvs [0] = new Vector2 (0, 0);  
        uvs [1] = new Vector2 (1, 0);  
        uvs [2] = new Vector2 (1, 1);  
        uvs [3] = new Vector2 (0, 1);  
        //顶点颜色  
        Color32[] colors32 = new Color32[4];  
        colors32 [0] = new Color32 (255, 255, 0, 255);  
        colors32 [1] = new Color32 (255, 255, 0, 255);  
        colors32 [2] = new Color32 (255, 255, 0, 255);  
        colors32 [3] = new Color32 (255, 255, 0, 255);  
        Mesh mesh = new Mesh ();  
        mesh.hideFlags = HideFlags.DontSave;  
        mesh.vertices = vertices;  
        mesh.triangles = triangles;  
        mesh.colors32 = colors32;  
        mesh.uv = uvs;  
        mesh.normals = normals;  
        mFilter.mesh = mesh;  
    }  
    // Update is called once per frame  
    void Update () {  
        MeshRectangle ();  
    }  
}  

注意：所使用的Shader需要支持顶点色，如NGUI中的Unlit - Text