【Render Texture】
Render Textures are special types of Textures that are created and updated at runtime. To use them, you first create a new Render Texture and designate one of your Cameras to render into it. Then you can use the Render Texture in a Material just like a regular Texture.
The Water prefabs in Unity Standard Assets are an example of real-world use of Render Textures for making real-time reflections and refractions.
Render Textures are a Unity Pro feature.
与Camera结合后，Render Texture可以用于实现镜子效果。