Unity User Manual Use the Unity Editor to create 2D and 3D games, apps and experiences. Download the Editor at unity3d.com. The Unity User Manual helps you learn how to use the Unity Editor and its associated services. You can read it from start to finish, or use it as a reference. If itвЂ™s your first time using Unity, take a look at the introductory documentation on Working with Unity, and see the Unity Tutorials. New. Upgrading Unity projects from older versions of Unity: Upgrade Guide. Best practice and expert guides. Best practices from Unity Support engineers: Best Practice Guides Expert guides from Unity developers, in their own words: Expert Guides. Unity User Manual sections. Working in Unity. A complete introduction to the Unity Editor. All of the Unity EditorвЂ™s 2D-specific features including gameplay, sprites A 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info See in Glossary and physics. The visual aspects of the Unity Editor including cameras A component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info See in Glossary and lighting. Simulation of 3D motion, mass, gravity and collisions A collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a rigidbody component and is in motion. More info See in Glossary . Networking.