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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
Tools
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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

Setting up object properties


Physical objects in the Box2D simulation environment contain many customizable properties. You can use this to adapt object behavior to suit your needs.

Getting ready

First of all, you'll need an object to set properties on. For all properties to be effective, you can use a dynamic object:

local body_def = box2d.BodyDef()
body_def.type = 'dynamic'
body_def.position = Vec(0,0)
body_def.angle = 0

local body = world.createBody(body_def)
local shape = box2d.CircleShape()
shape.radius = 1

local fixture_def = box2d.FixtureDef()
fixture_def.shape = box_shape
fixture_def.density = 1

local fixture = body.createFixture(fixture_def)

Now that you've got everything prepared, you can set up physical object properties. Keep in mind that you should never change object properties during a simulation cycle as it will lead to simulation errors. You can determine this situation by querying the World object world.locked. The world object is locked when you're in the middle of the...

lock icon The rest of the chapter is locked
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