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 8: Creating Curves, Frames, and Tracks

In the early 2000s, it was common for games to take an animation that was authored in a 3D content creation tool such as Blender or Maya, play back the animation, and sample the transform of every joint in the animation at set intervals. Once the animation was sampled, the game's runtime linearly interpolated between the sampled frames.

While this works (and is doable with glTF files), it's not the most accurate way to play back animations. It wastes memory by including frames that don't actually need to exist. In a 3D content creation tool, animations are created using curves, such as the one shown in the following screenshot:

Figure 8.1: The Blender 3D curve editor

Figure 8.1: The Blender 3D curve editor

Modern games and animation systems evaluate these curves directly. Evaluating the animation curves directly saves memory, but curves are a bit more expensive in terms of processing power. By the end of this chapter, you should...