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)

Chapter 4: Implementing Quaternions

In this chapter, you will learn about quaternions. Quaternions are used to encode rotations. A quaternion is a complex number in an xi + yj + zk + w form. Think of i, j,

and k as placeholders that each represent a three-dimensional axis. w is a real number. While quaternions don't directly encode an angle axis pair, it's easy to think of them

as just that—a rotation about an arbitrary axis.

By the end of this chapter, you should have a strong understanding of what quaternions are and how to use them and you will have implemented a robust quaternion class in code. This chapter will cover the following topics:

  • Different methods for creating quaternions
  • Retrieving the angle and axis of a quaternion
  • Basic component-wise operations
  • The length and dot product of two quaternions
  • Inverting quaternions
  • Combining quaternions
  • Transforming vectors by quaternions
  • Interpolating between quaternions...