Search icon CANCEL
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
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

Arrow left icon
Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781849515504
Length 360 pages
Edition 1st Edition
Languages
Tools
Arrow right icon
Author (1):
Arrow left icon
Mário Kašuba Mário Kašuba
Author Profile Icon Mário Kašuba
Mário Kašuba
Arrow right icon
View More author details
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 collision filtering


Object collision might not be always desirable. For example, if your game allows multiplayer, it can be frustrating when another player blocks your movement right in front of doors and you can't get past them. The Box2D library solves this problem with the binary mask for collisions.

Getting ready

This recipe will require a basic understanding of bitwise operations. You'll need at least two FixtureDef or Fixture objects.

How to do it…

The Box2D library uses a pair of two 16-bit binary masks to determine whether two objects should collide. The first one is called categoryBits and it indicates the object category. The second one uses the name maskBits and it indicates what object categories are allowed to collide with the current object. The following sample code shows the typical uses of these bit-masks in the FixtureDef object:

local fixture_def = box2d.FixtureDef()
fixture_def.shape = shape
fixture_def.density = 1.5
fixture_def.friction = 0.3
fixture_def...
lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at £16.99/month. Cancel anytime