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Game Physics Cookbook

You're reading from Game Physics Cookbook Discover over 100 easy-to-follow recipes to help you implement efficient game physics and collision detection in your games

Product type Paperback

Published in Mar 2017

Publisher Packt

ISBN-13 9781787123663

Length 480 pages

Edition 1st Edition

Languages

C++

Tools

Unity

Concepts

Game Design

Author (1):

Gabor Szauer

View More author details

Table of Contents (19) Chapters

Preface

1. Vectors FREE CHAPTER

2. Matrices

3. Matrix Transformations

4. 2D Primitive Shapes

5. 2D Collisions

6. 2D Optimizations

7. 3D Primitive Shapes

8. 3D Point Tests

9. 3D Shape Intersections

10. 3D Line Intersections

11. Triangles and Meshes

12. Models and Scenes

13. Camera and Frustum

14. Constraint Solving

15. Manifolds and Impulses

16. Springs and Joints

A. Advanced Topics

Index

Stability improvements

We can make several improvements to the stability of our physics engine. We fixed the problem of sinking using linear projection in Chapter 15, Manifolds and Impulses. Linear projection introduces its own flaws into our engine: jitter and object crawling. We used heavy friction to cover these issues up. Older physics engines had similar issues; they tended to use aggressive sleeping to cover these issues up. When a rigid body is asleep, it has no forces acting on it (including gravity) and therefore does not sink.

The more modern approach to fixing these issues is called Baumgarte Stabilization. Baumgarte Stabilization works by adding extra energy to physics resolution. This extra energy causes some jitter, but fixes the issues of sinking and crawling. We can add slop to the system, similarly to how we added slop to linear projections to fix the jitter issue.

Baumgarte Stabilization requires us to accumulate impulses over frames. In order to accumulate impulses, we...

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Authors (1)

Gabor Szauer

Gabor Szauer

Gabor Szauer has been making games since 2010. He graduated from Full Sail University in 2010 with a bachelor's degree in game development. Gabor maintains an active Twitter presence, and maintains a programming-oriented game development blog. Gabor's previously published books are Game Physics Programming Cookbook and Lua Quick Start Guide, both published by Packt.

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