在Unity3D中实现高效的战斗飘字

这周有网友提到用NGUI做战斗冒血，冒伤害等文字性能太差。确实如此，我之前（NGUI 3.8.2，1000块的Android机器上）在Profile中也发现UIPanel占用CPU奇高。

因此最终自己在战斗飘文字这一块没有使用NGUI，而是自己创建Mesh来处理。优化前后在手机上每秒大概增加了10帧。

先看一下效果。

可以看到DrawCall和NGUI一样都为1。

这个 MeshText 就是我自己写的HUD文本组件了。

代码如下：

using UnityEngine;
[ExecuteInEditMode]
public class MeshText : MonoBehaviour
{
    [SerializeField]
    private string _text = "";

    public MeshFilter meshFilter;
    public MeshRenderer meshRenderer;

    [HideInInspector]
    public Material material;

    public UIAtlas uiAtlas;

    [SerializeField]
    private Color _color1 = Color.white;
    public Color color1
    {
        get { return _color1; }
        set { 
            _color1 = value;
        }
    }

    [SerializeField]
    private Color _color2 = Color.white;
    public Color color2
    {
        get { return _color2; }
        set
        {
            _color2 = value;
        }
    }

    public enum HorizontalAlignType
    {
        Left,
        Center,
        Right
    }

    //当text中存在宽度不一致的字体时，计算Center和Right会有误差。不过对于战斗HUD，够用了。
    public HorizontalAlignType HAlignType;
    public string Text {
        get { return _text; }
        set
        {
            _text = value;
            GenerateFilter();
        }
    }

    void Awake() {
#if UNITY_EDITOR
        meshRenderer.sharedMaterial = uiAtlas.spriteMaterial;
        material = meshRenderer.sharedMaterial;
#else
        meshRenderer.material = uiAtlas.spriteMaterial;
        material = meshRenderer.material;
#endif
        if (!string.IsNullOrEmpty(_text))
        {
            GenerateFilter();
        }
    }

    public void GenerateFilter() {
        Mesh mesh = new Mesh();

        int length = Text.Length;
        Vector3[] vertices = new Vector3[length 2);
                break;
            default:
                tmp2 = 0;
                break;
        }
        float r = 1;
        for (int i = 0; i < vertices.Length; i+=4) {
            tmp = (i + 1) % 2;

            string s = Text[i / 4].ToString();
            UISpriteData mSprite = uiAtlas.GetSprite(s);
            r = (mSprite.width * 1.0f / mSprite.height);
            //setting vertices
            vertices[i    ] = new Vector3( tmp2, tmp + 1 );
            vertices[i + 1] = new Vector3( tmp2, tmp );
            tmp2 += r;
            vertices[i + 2] = new Vector3( tmp2, tmp + 1 );
            vertices[i + 3] = new Vector3( tmp2, tmp );

             colors = color1;
            colors[i+1] = color2;
            colors[i+2] = color1;
            colors[i+3] = color2;

            //setting uvs

            Rect inner = new Rect(mSprite.x + mSprite.borderLeft, mSprite.y + mSprite.borderTop,
                mSprite.width - mSprite.borderLeft - mSprite.borderRight,
                mSprite.height - mSprite.borderBottom - mSprite.borderTop);
            inner = NGUIMath.ConvertToTexCoords(inner, tex.width, tex.height);

            uvs = new Vector2(inner.xMin, inner.yMax);
            uvs[i + 1] = new Vector2(inner.xMin, inner.yMin);
            uvs[i + 2] = new Vector2(inner.xMax, inner.yMax);
            uvs[i + 3] = new Vector2(inner.xMax, inner.yMin);
        }

        for (int i = 0; i < triangles.Length; i+=6) {
            tmp = (i / 3)