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  • Book Overview & Buying Lua Game Development Cookbook
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Lua Game Development Cookbook

Lua Game Development Cookbook

By : Mário Kašuba
4.3 (6)
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Lua Game Development Cookbook

Lua Game Development Cookbook

4.3 (6)
By: Mário Kašuba

Overview of this book

This book is for all programmers and game enthusiasts who want to stop dreaming about creating a game, and actually create one from scratch. The reader should know the basics of programming and using the Lua language. Knowledge of the C/C++ programming language is not necessary, but it's strongly recommended in order to write custom Lua modules extending game engine capabilities or to rewrite parts of the Lua code into a more efficient form. Algebra and matrix operations are required in order to understand advanced topics in Chapter 4, Graphics – Legacy Method with OpenGL 1.x-2.1 and Chapter 5, Graphics – Modern Method with OpenGL 3.0+. Sample demonstrations are coupled with binary libraries for Windows and Linux operating systems for convenience.
Table of Contents (11 chapters)
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10
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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