This project forked from huailiang/hud
游戏血条
Home Page: https://huailiang.github.io/blog/2018/hud/
License: MIT License
本文对应的blog地址：https://huailiang.github.io/blog/2018/hud/
目前unity里UI实现一般都是通过NGUI或者uGUI。
由于层级交错导致DrawCall的升高，带来的问题就是性能的降低。
血条往往是动态的，但这些动态的东西往往会触发Lateupdate的Rebuild,从来带来一帧较大的开销，容易触发gc
这里介绍的方法是通过3D mesh的方式绘制血条，所有的HUD能够动态batch合批, 只有2个drawcall的开销。
代码动态创建Mesh（八个顶点，4个三角，绘制血条开销不可能再省了）， Shader里采样顶点色来生成血条
字体也不再使用2d UI的Text或者UILable这样的是空间，而是3D TextMesh.
HudShow 采用GUI的Slider来更新血条
DCShow 通过创建大量的hud，来查看drawcall的变化
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