Book Image

Hands-On C++ Game Animation Programming

By : Gabor Szauer
Book Image

Hands-On C++ Game Animation Programming

By: Gabor Szauer

Overview of this book

Animation is one of the most important parts of any game. Modern animation systems work directly with track-driven animation and provide support for advanced techniques such as inverse kinematics (IK), blend trees, and dual quaternion skinning. This book will walk you through everything you need to get an optimized, production-ready animation system up and running, and contains all the code required to build the animation system. You’ll start by learning the basic principles, and then delve into the core topics of animation programming by building a curve-based skinned animation system. You’ll implement different skinning techniques and explore advanced animation topics such as IK, animation blending, dual quaternion skinning, and crowd rendering. The animation system you will build following this book can be easily integrated into your next game development project. The book is intended to be read from start to finish, although each chapter is self-contained and can be read independently as well. By the end of this book, you’ll have implemented a modern animation system and got to grips with optimization concepts and advanced animation techniques.
Table of Contents (17 chapters)

Additive blending

Additive animations are used to modify an animation by adding in extra joint movements. A common example is leaning left. If there is a leaning-left animation that simply bends the character's spine, it can be added to a walking animation to create a leaning-left-while-walking animation, a running animation, or any other kind of animation.

Not all animations are a good fit for additive animations. Additive animations are usually specifically made. I have added a Lean_Left animation to the Woman.gltf file provided with the sample code for this chapter. This animation is made to be additive. It only bends one of the spine joints.

Additive animations typically don't play according to time, but rather, according to some other input. Think of leaning left as an example—it should be controlled by the user's joystick. The closer the joystick is to the left, the further in the animation the lean should go. It's common to sync the playback...