Book excerpt: Unity is a feature-rich, fully-integrated development engine that provides out-of-the-box functionality for the creation of interactive 3D content. It is an exciting engine that has a rich and sophisticated animation system called Mecanim. Unity Animation Essentials offers a comprehensive introduction to powerful animation tools and principles in Unity, which can be used to make great games. This book starts by exploring core animation concepts and then dives deeper to demonstrate their practical application in real-time games. This book shares extensive and useful insights to create animations using a professional grade workflow, and to create responses and interactive scenes. Each chapter focuses on a specific range of topics, from timing and events to character animation and particle systems. By the end of the book, you should be able to fully utilize the powers of Mecanim and Unity.