【Unity3D Text】
3D Text通过"Text Mesh"组件、"MeshRender共同完成"，通过如下方法要以创建一个3D Text。
3D Text对象包含如下组件：
最常用的需要所有人都关注的三个方法如下：
Font必须是ttf字体，导入ttf很简单，直接把ttf文件放入工程的Asset目录或子目录中即可。
参考：file://localhost/Applications/Unity/Unity.app/Contents/Documentation/Documentation/Components/class-TextMesh.html
【GUI Text】
通过 Hierarchy 中的"Create" -> "GUI Text"创建。
其中关键参数有几下几个：
Material: Reference to the Material containing the characters to be drawn. If set, this property overrides the one in the Font asset.
Pixel Correct：If enabled, all Text characters will be drawn in the size of the imported font texture. If disabled, the characters will be resized based on the Transform's Scale.
注意要点：
GUI Texts are used to print text onto the screen in 2D. The Camera has to have a GUI Layer attached in order to render the text. Cameras include a GUI Layer by default, so don't remove it if you want to display a GUI Text. GUI Texts are positioned using only the X and Y axes. Rather than being positioned in World Coordinates, GUI Texts are positioned in Screen Coordinates, where (0,0) is the bottom-left and (1,1) is the top-right corner of the screen.
【GUILayer】
【GUI Texture】
GUI Texture用于显示一个texture，一个texture可以用作九宫格。另外一个texture有大小。
GUI Texture属性如上，很简单。和GUI Text一样，它俩作为仅有的2个受GUILayer组件影响的对象，是Unity抛弃的东西，UnityGUI被设计用来替代它俩。
参考：file:///D:/Program%20Files%20(x86)/Unity/Editor/Data/Documentation/Documentation/Components/class-GuiTexture.html
