Unity 3D UI Essentialb Unitys new and improved UI system makes games and apps cool! b Unity has a new and improved UI system since version 4.6. The Unity UI system allows you to develop games and apps creatively and freely. In this book, first look at the legacy GUI to see what has changed, and then look at the new Unity UI system. In addition to basic controls, it covers reactive layouts that adapt to various resolutions and how to build a UI in 3D space. We will also look at the event system, which is closely related to the UI system, and finally, how to understand the UI framework source code that is open source.