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Lua Game Development Cookbook

You're reading from   Lua Game Development Cookbook Over 70 recipes that will help you master the elements and best practices required to build a modern game engine using Lua

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Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781849515504
Length 360 pages
Edition 1st Edition
Languages
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Author (1):
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Mário Kašuba Mário Kašuba
Author Profile Icon Mário Kašuba
Mário Kašuba
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Toc

Table of Contents (11) Chapters Close

Preface 1. Basics of the Game Engine 2. Events FREE CHAPTER 3. Graphics – Common Methods 4. Graphics – Legacy Method with OpenGL 1.x–2.1 5. Graphics – Modern Method with OpenGL 3.0+ 6. The User Interface 7. Physics and Game Mechanics 8. Artificial Intelligence 9. Sounds and Networking Index

Choosing the correct vector scaling for the physics engine


The Box2D library uses floating numbers to represent numerical values. The problem with these kind of numbers is that they offer limited precision. This limitation often results in various artefacts such as players walking right above the ground or boxes that can't remain in one place. Box2D uses the MKS (meters, kilograms, and seconds) system to represent the basic units. You should never use a pixel as a base unit. Therefore, you are expected to use the scaling factor to convert Box2D coordinates to pixels on the screen.

Getting ready

First, you should decide what scaling factor you will use. If you decide that 100 pixels will represent 1 meter, the scaling factor will be 100. You can define this factor as a global constant in the Lua language:

box2dScalingFactor = 100

How to do it…

When converting pixel-sized objects or vectors to the Box2D system, the scaling factor will be used to scale down by dividing all those values. The following...

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