Tài liệu Panda3d 1.6 game engine

www.it-ebooks.info Panda3D 1.6 Game Engine Beginner's Guide Create your own computer game with this 3D rendering and game development framework David Brian Mathews www.it-ebooks.info Panda3D 1.6 Game Engine Beginner's Guide Copyright © 2011 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: February 2011 Production Reference: 1040211 Published by Packt Publishing Ltd. 32 Lincoln Road Olton Birmingham, B27 6PA, UK. ISBN 978-1-849512-72-5 www.packtpub.com Cover Image by Charwak A ([email protected]) www.it-ebooks.info Credits Author Editorial Team Leader David Brian Mathews Reviewers Project Team Leader Paulo Barbeiro Ferreira Joni Hariyanto Zainab Bagasrawala Usha Iyer Joel Goveya Development Editor Proofreaders Reshma Sundaresan Aaron Nash Jonathan Todd Technical Editors Arun Nadar Graphics Manasi Poonthottam Hemangini Bari Ashwin Shetty Project Coordinators Acquisition Editor Indexer Mithun Sehgal Nilesh R. Mohite Production Coordinator Kruthika Bangera Cover Work Kruthika Bangera www.it-ebooks.info About the Author David Brian Mathews is a graduate in Electronic Visualization program from the University of Illinois at Chicago. He began programming in the fifth grade with QBASIC and has been designing games of various kinds, from table-top board games to computer games, since childhood. Prior to entering higher education, he served for two years in the United States Navy as a nuclear engineer before being honorably discharged for medical reasons, where he learned discipline, advanced mathematics, and nuclear theory, as well as teamwork and leadership skills. During his years in school, Mathews earned valuable experience with professional game development methods working both by himself and with teams. He is skilled at programming, 3D modeling and animation, drawing, and 2D compositing. I'd like to thank my friends and family, who have been immensely supportive of me throughout the writing of this book. In particular, I'd like to thank my mother, Carol Malley, and my friends Jeff Fuja and William Hebert for all their efforts and sacrifices on my behalf. www.it-ebooks.info About the Reviewers Paulo Barbeiro Ferreira is Brazilian, from São Paulo, and graduated in Graphic Design in 2004 at Belas Artes SP college. He is a postgraduate in Game Development at SENAC SP. Paulo started his professional career in 1999 as a web developer. Today, besides the web and mobile application development work, Paulo is involved in experimental educational projects in technology and cyber culture at SESC SP, where he leads activities about creative code and art software, such as interactive environments, games, and entertainment media. Joni Hariyanto graduated from the Engineering Faculty of Brawijaya University a few years ago. Now, he works as a freelance architect. Actually, he's just a hobbyist in the computer science world. He has been programming since first grade junior high in languages including Pascal, Python, and C++. Bored with the never changing architectural visualization teaching materials at uni, he wandered on the Internet searching for a way to get unlimited control over visualization, for the sake of design clarity and without sacrificing too much time in the "post-design" phase; that is, rendering the gazillion frames. He stumbled upon Panda3D in 2005, a free 3D game engine, which makes perfect balance of power, flexibility, and handling (from programmer's point of view). Liked it, melted with it in no time, thanks to Python. www.it-ebooks.info www.PacktPub.com Support files, eBooks, discount offers, and more You might want to visit www.PacktPub.com for support files and downloads related to your book. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? 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Simply use your login credentials for immediate access. www.it-ebooks.info Table of Contents Preface Chapter 1: Installing Panda3D and Preparing a Workspace Getting started with Panda3D installation packages Time for action – downloading and installing Panda3D Switching to an advanced text editor Time for action – downloading and installing Notepad++ Installing the game content Time for action – demoing Suicide Jockeys Installing optional tools Blender and Chicken Spacescape Explosion Texture Generator Summary 1 7 8 8 11 11 13 13 14 15 16 16 17 Chapter 2: Creating the Universe: Loading Terrain 19 Notepad++ Setting up a new file in Notepad++ Time for action – setting up a new file in Notepad++ Importing Panda3D components Time for action – importing DirectStart Creating a World Object Time for action – creating a World Object Loading the terrain Time for action – loading the terrain Loading files into Panda3D The model path Eggs Bams NodePaths and nodes 20 20 20 21 21 22 23 27 28 30 30 30 32 32 www.it-ebooks.info Table of Contents Time for action – introducing NodePaths and nodes Manipulating NodePaths Time for action – manipulating NodePaths The Scene Graph Time for action – understanding parent child inheritance Time for action – explaining relative coordinate systems Loading a file multiple times Render attributes Time for action – demonstrating render attributes Summary Chapter 3: Managing Tasks Over Time 33 35 36 37 38 40 41 41 43 46 47 The task manager Time for action – printing the task list from the task manager Avoiding multiple task managers Adding tasks to the task manager Time for action – creating a task and adding it to the task manager Time for action – looking at task statistics Adding a delay to tasks Time for action – using doMethodLater Using delta time Time for action – using delta time Over viewing task return options About the None type object Time for action – exploring task return options Prioritizing tasks Removing tasks from the task manager Time for action – removing tasks by name Dissecting task objects Summary Chapter 4: Taking Control: Events and User Input Working with events Time for action – registering and responding to events Using keyboard events Using a key map Time for action – creating and using a key map Implementing advanced cycle controls Time for action – implementing acceleration Time for action – implementing throttle control Time for action – implementing turning Utilizing mouse input and creating camera control [ ii ] www.it-ebooks.info 48 48 49 49 50 52 54 54 55 56 57 58 58 61 61 62 64 65 67 67 68 70 71 72 75 75 78 80 82 Table of Contents Time for action – tying the camera to the cycle Reacting to mouse movement Time for action – turning the camera with the mouse position Ending event response Summary Chapter 5: Handling Large Programs with Custom Classes 82 84 85 86 87 89 Importing custom classes Time for action – making and importing a custom class Adding NodePath functionality to a custom class Time for action – defining the Cycle class Simulating drift Time for action – simulating drift Accessing classes from within another class Time for action – adding an input manager Summary 89 90 93 93 97 97 103 103 107 Chapter 6: The World in Action: Handling Collisions 109 Collision basics: Our first collision system Time for action – creating a simple collision detection system Creating inter-cycle collisions Time for action – inter-cycle collisions Using BitMasks to organize collisions Time for action – implementing BitMasks Time for action – setting a range of bits with BitMask.range Using Python tags to get colliding objects Time for action – setting and getting PythonTags Setting up ground collision Time for action – creating a ground collision system Overview of additional collision solids and handlers Collision solids Collision handlers Summary Chapter 7: Making it Fancy: Lighting, Textures, Filters, and Shaders Adding lighting Time for action – adding lights to the game Types of lights Applying textures to models Time for action – creating a bam writer Texture stages Time for action – using TextureStages Creating filters [ iii ] www.it-ebooks.info 109 110 116 116 122 123 124 126 126 128 128 142 142 144 144 145 145 146 149 150 151 154 156 161 Table of Contents Time for action – adding a bloom filter Using a sky sphere Time for action – adding a sky sphere Summary 161 164 164 167 Chapter 8: GUI Goodness: All About the Graphic User Interface Creating a menu system About DirectGUI Time for action – creating a menu system Putting menus to use Time for action – using menus In-game HUD Time for action – creating a basic HUD Summary Chapter 9: Animating in Panda3D 169 169 170 171 187 188 195 196 203 205 Actors and Animations Time for action – loading Actors and Animations Controlling animations Animation blending Time for action – blending two animations Creating and using Actor subparts Time for action – playing animations on subparts Exposing joints Time for action – animating our cycles Summary Chapter 10: Creating Weaponry: Using Mouse Picking and Intervals Using mouse picking Time for action – setting up mouse aim Understanding Intervals, Sequences, and Parallels Sequences and Parallels Creating machine guns Time for action – using Intervals in Sequences and Parallels Time for action – adding collision detection to the MachineGun Implementing the main cannon Time for action – creating the main cannon Adding weapon information to the HUD Time for action – adding a new HUD section Handling damage response Time for action – finalizing weapons with damage response Summary [ iv ] www.it-ebooks.info 205 206 208 209 209 211 213 214 215 219 221 221 222 225 228 229 229 235 238 238 242 243 247 247 251 Table of Contents Chapter 11: What's that Noise? Using Sound Editing Config.prc Time for action – selecting an audio library Adding music AudioSound objects AudioManager objects Time for action – creating background music Adding sound effects Time for action – generating 3D audio with Audio3DManager About sound intervals Summary Chapter 12: Finishing Touches: Getting the Game Ready for the Customer Collecting garbage Time for action – collecting garbage from the Explosion classes Time for action – collecting garbage from the Gun classes Time for action – collecting garbage from the Cycle class Time for action – collecting garbage from the Track class Creating a preloader Time for action – creating a preloader to load models File handling Time for action – reading data from a file Customizing the mouse cursor Time for action – customizing the mouse cursor Creating an Installer Time for action – packing a Panda3D game Summary Appendix A: Creating a Sky Sphere with Spacescape Learning Spacescape basics Time for action – getting started with Spacescape Blending layers Time for action – blending layers to create nebulas Using point stars and billboard stars Time for action – populating the sky with stars Creating a sky sphere from a skybox made with Spacescape Time for action – populating the sky with stars Time for action – creating the sky sphere in Panda3D Summary 253 253 254 254 254 256 257 258 258 263 264 265 265 267 269 270 272 273 273 276 277 278 279 282 282 285 287 288 289 292 294 297 297 302 302 303 305 Appendix B: Using Egg-Texture-Cards and ExploTexGen 307 Using ExploTexGen Time for action – reading the ExploTexGen documentation 308 308 [v] www.it-ebooks.info Table of Contents Time for action – designing an explosion Creating flipbook animations with egg-texture-cards Time for action – using egg-texture-cards Additional egg-texture-card options Summary Appendix C: Pop quiz Answers 310 313 313 314 315 317 Chapter 2: Creating the Universe: Loading Terrain Starting Panda3D and loading models Using NodePath and understanding scene graph inheritance Chapter 3: Managing Tasks Over Time The task manager Delta time Task return options Chapter 4: Taking Control: Events and User Input Working with events Using keyboard input Utilizing mouse input Chapter 5: Handling Large Programs with Custom Classes Importing custom classes Accessing custom classes from other classes Chapter 6: The World in Action: Handling Collisions Regarding basic collision detection Understanding handlers that generate events Understanding BitMasks Using Python tags Complex collision detection Chapter 7: Making it Fancy: Lighting, Textures, Filters, and Shaders Using lights Understanding textures and TextureStages Setting up a sky sphere Chapter 8: GUI Goodness: All About the Graphic User Interface Understanding DirectGUI Creating a Heads Up Display Chapter 9: Animating in Panda3D Animation basics Advanced animation Chapter 10: Creating Weaponry: Using Mouse Picking and Intervals Mouse picking Intervals [ vi ] www.it-ebooks.info 317 317 318 318 318 318 318 319 319 319 319 319 319 320 320 320 320 321 321 321 322 322 322 322 323 323 323 323 323 323 324 324 324 Table of Contents Chapter 11: What's that Noise? Using Sound Making music Sounding off Chapter 12: Finishing Touches: Getting the Game Ready for the Customer Garbage collection Using a custom mouse cursor Building an installer Index 325 325 325 325 325 326 326 327 [ vii ] www.it-ebooks.info www.it-ebooks.info Preface Panda3D is a game engine, a framework for 3D rendering and game development for Python and C++ programs. It includes graphics, audio, I/O, collision detection, and other abilities relevant to the creation of 3D games. Also, Panda3D is Open Source and free for any purpose, including commercial ventures. This book will enable you to create finished, marketable computer games using Panda3D and other entirely open source tools, and then sell those games without paying a cent for licensing. Panda3D 1.6 Game Engine Beginner's Guide follows a logical progression from a zero start through the game development process all the way to a finished, packaged installer. Packed with examples and detailed tutorials in every section, it teaches the reader through firsthand experience. These tutorials are followed by explanations that describe what happened in the tutorial and why. You will start by setting up a workspace, and then move on to the basics of starting up Panda3D. From there, you will begin adding objects such as a level and a character to the world inside Panda3D. Then, the book will teach you to put the game's player in control by adding changes over time and responses to user input. Then, you will learn how to make it possible for objects in the world to interact with each other by using collision detection and beautify your game with Panda3D's built-in filters, shaders, and texturing. Finally, you will add an interface, audio, and package it all up for the customer. This is a simple but detailed guide to using Panda3D, which will take you from a blank text file all the way through the Python programming process to a finished game with a single level, including such topics as handling tasks over time, event handling and response, collision set up and detection, audio, and more. www.it-ebooks.info Preface Who this book is for This book is targeted at independent developers who are interested in creating their own video games or other 3D applications for personal or commercial distribution at minimal expense. A basic understanding of general programming, such as knowing what a variable is, is necessary. Some familiarity with object-oriented programming and the Python language is expected, but not required. Development teams who are interested in using Panda3D for production of 3D applications or video games would also find this book useful for training team members in the use of Panda3D. This book does not cover the creation of three-dimensional models or similar art assets, nor does it cover the creation of two-dimensional art assets or audio assets. What this book covers Chapter 1, Installing Panda3D and Preparing a Workspace guides the reader through downloading and installing Panda3D and Notepad++ (an open source text editor) as well as acquiring assets provided with the book (from CD or website) and setting up the file structure for that content using Windows Explorer. Chapter 2, Creating the Universe: Loading Terrain is the reader's first opportunity to get their hands dirty with some coding. It will take them from a blank file to a simple program that will load up a terrain model and introduce related basic concepts. Chapter 3, Managing Tasks Over Time introduces the reader with tasks, the task manager, and controlling processes that need to occur over time or in an ongoing manner. Chapter 4, Taking Control: Events and User Input focuses on creating user controls for the game. Keyboard, mouse click, and mouse movement response will be covered. Camera control will be integrated with handling mouse input. Chapter 5, Handling Large Programs with Custom Classes; as the game has grown larger, the time has come to show the reader how to break it apart into custom classes. Chapter 6, The World in Action: Handling Collisions will focus on making the reader comfortable with collision detection and the different collision event handlers. Collisions are vital to a working game and their use is one of the hottest topics on the Panda3D forums. Chapter 7, Making it Fancy: Lighting, Textures, Filters, and Shaders will explain textures and the built-in shaders available in Panda3D while allowing the reader to apply lighting, textures, filters, and shaders to the world and the characters in it. Chapter 8, GUI Goodness: All About the Graphic User Interface takes the reader through the production of the game's GUI, including the HUD that displays during game play, the start menu, and other bits and pieces. [2] www.it-ebooks.info Preface Chapter 9, Animating in Panda3D; here the reader will replace the static models of hover cycles with actors and learn all about actor animation and joint manipulation. Chapter 10, Creating Weaponry: Mouse Picking and Intervals focuses on using intervals to create weapons and their controls and describes how sequences and parallels can be used to create interval scripts. Chapter 11, What's that Noise? Using Sound; here with the game nearly complete, it's time to introduce some sound effects and background music to bring the game to life. This chapter also introduces editing the config.prc file to change the audio library Panda3D uses. Chapter 12, Finishing Touches: Getting the Game Ready for the Customer is the final chapter of the guide and focuses on some important functions for Panda3D-based games, including saving and loading files, garbage collection, and packing the game into a standalone package ready for shipping. Appendix A, Creating a Sky Sphere with Spacescape teaches the reader how to use the freely available software Spacescape to create engaging backdrops for Panda3D applications. Appendix B, Using Egg-Texture-Cards and ExploTexGen; here the reader learns how to create explosion animations with the freely available software ExploTexGen and learns to turn them into Panda3D assets with the Egg-Texture-Cards command-line utility. What you need for this book Panda3D 1.6, Notepad++, and Python. Conventions In this book, you will find several headings appearing frequently. To give clear instructions of how to complete a procedure or task, we use: Time for action – heading 1. Action 1 2. Action 2 3. Action 3 [3] www.it-ebooks.info Preface Instructions often need some extra explanation so that they make sense, so they are followed with: What just happened? This heading explains the working of tasks or instructions that you have just completed. You will also find some other learning aids in the book, including: Pop quiz – heading These are short multiple choice questions intended to help you test your own understanding. Have a go hero – heading These set practical challenges and give you ideas for experimenting with what you have learned. You will also find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and explanations of their meanings. Code words in text are shown as follows: "The event name we give to the accept() method is a string that serves as an identifier for the unique event we want to respond to." A block of code is set as follows: if(self.keyMap["d"] == True): self.turn("r", dt) elif(self.keyMap["a"] == True): self.turn("l", dt) When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold: self.menuGraphics = loader.loadModel( "../Models/MenuGraphics.egg") self.fonts = { "silver" : loader.loadFont("../Fonts/LuconSilver.egg"), "blue" : loader.loadFont("../Fonts/LuconBlue.egg"), "orange" : loader.loadFont("../Fonts/LuconOrange.egg")} New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Now we see an entry for the Cycle Move task in the sleep column". [4] www.it-ebooks.info Preface Warnings or important notes appear in a box like this. Tips and tricks appear like this. Reader feedback Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or may have disliked. Reader feedback is important for us to develop titles that you really get the most out of. To send us general feedback, simply send an e-mail to [email protected], and mention the book title via the subject of your message. If there is a book that you need and would like to see us publish, please send us a note in the SUGGEST A TITLE form on www.packtpub.com or e-mail [email protected]. If there is a topic that you have expertise in and you are interested in either writing or contributing to a book, see our author guide on www.packtpub.com/authors. Customer support Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase. Downloading the example code for this book You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the files e-mailed directly to you. Downloading the color images of this book We also provide you a PDF file that has color images of the screenshots used in this book. The color images will help you better understand the changes in the output. You can download this file from https://www.packtpub.com/ sites/default/files/2725_images.pdf [5] www.it-ebooks.info