Book Image

C++ Game Animation Programming - Second Edition

By : Michael Dunsky, Gabor Szauer
4.5 (2)
Book Image

C++ Game Animation Programming - Second Edition

4.5 (2)
By: Michael Dunsky, Gabor Szauer

Overview of this book

If you‘re fascinated by the complexities of animating video game characters and are curious about the transformation of model files into 3D avatars and NPCs that can explore virtual worlds, then this book is for you. In this new edition, you’ll learn everything you need to know about game animation, from a simple graphical window to a large crowd of smoothly animated characters. First, you’ll learn how to use modern high-performance graphics, dig into the details of how virtual characters are stored, and load the models and animations into a minimalistic game-like application. Then, you’ll get an overview of the components of an animation system, how to play the animations and combine them, and how to blend from one animation into another. You’ll also get an introduction to topics that will make your programming life easier, such as debugging your code or stripping down the graphical output. By the end of this book, you’ll have gained deep insights into all the parts of game animation programming and how they work together, revealing the magic that brings life to the virtual worlds on your screen.
Table of Contents (22 chapters)
1
Part 1:Building a Graphics Renderer
7
Part 2: Mathematics Roundup
10
Part 3: Working with Models and Animations
15
Part 4: Advancing Your Code to the Next Level

How (not) to apply a skin to a skeleton

To create a character for a game, we need to apply a body structure that fits the intended role in the game. For example, a male wizard has a different body than a female elf, and both are completely different to a human blacksmith. Therefore, the skin needs to reflect the amount of muscle and fat on the body of the model to appear plausible.

Naive model skinning

The naive way of applying a skin to a character skeleton is by using constant distances from the start and end of a node. This works if the entire model moves, but if individual nodes are rotated or translated, the character body will be distorted in an unwanted manner. In Figure 9.4, you can see the effect of the rotation of the middle and right nodes of a part of a functional character:

Figure 9.4. Naive idea of applying the skin to moving nodes gone wrong

Figure 9.4. Naive idea of applying the skin to moving nodes gone wrong

Nodes are shown as blue arrows, vertices are red dots, and the skin is depicted by the red...