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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

Setting up the orthogonal and perspective cameras


The camera view is affected by the projection matrix. The projection matrix allows you to set up the camera position, rotation and the size of visible space.

Games mostly use two modes of camera projection. The first one is the orthogonal mode, which can be used to draw 2D scenes on the screen. This mode doesn't use the perspective camera, so the object's distance doesn't affect its size. On the other hand, the perspective mode causes farther objects to be visibly smaller than the nearer objects.

Getting ready

This recipe will assume that the current screen dimensions are stored in the variables screen_width and screen_height. These variables might change their values when you resize the application window or change the screen resolution. You might want to update these variables on resize event.

How to do it…

Camera space operations are divided into two parts. The first one shows how to use orthogonal projection for 2D screen elements and the...

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