Book Image

Panda3D 1.6 Game Engine Beginner's Guide

Book Image

Panda3D 1.6 Game Engine Beginner's Guide

Overview of this book

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 first-hand 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 like 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 change over time and response 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.
Table of Contents (22 chapters)
Panda3D 1.6 Game Engine
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – collecting garbage from the Gun classes


Let's move right along to our Gun classes. These are created and destroyed with the cycles, so we need to make sure they are getting garbage collected properly.

  1. Open the GunClasses_00.py file from the Chapter12 folder. Update the imports section to use ExplosionClasses_02.py.

  2. Testing comes first, so put the following method at the bottom of the MachineGun class:

      def __del__(self):
        print("Machine Gun Removed")
  3. Then, put this method at the bottom of the Cannon class:

      def __del__(self):
        print("Cannon Removed")
  4. This time, resave the file as GunClasses_01.py. Open CycleClass_00.py and update the import to use Gunclasses_01.py, then resave the file with Ctrl+S and run the game. Click the New Game menu button to destroy some cycles and check our garbage collection on the guns.

  5. This time we got it in the first try, as we can see from the printout to the command prompt shown in the following screenshot. Go ahead and remove the __del__...