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 Explosion classes


We're starting with the Explosion classes because they don't create instances of any other classes. A depth-up kind of strategy is as good as any for this kind of testing.

  1. Open the ExplosionClasses_00.py file from the Chapter12 folder.

  2. Add the following method to the bottom of the Pop class:

      def __del__(self):
        print("Pop Removed")
  3. Add this method to the bottom of the Boom class:

      def __del__(self):
        print("Boom Removed")
  4. Resave the file with the same name and run the game. Watch the command prompt for our prints when Pops and Booms vanish.

  5. We don't see the prints! That's because we have two errors in our classes that need to be fixed. Firstly, we're using a Sequence to call our destroy method after a set amount of time, but we aren't starting that Sequence so our destroy method is never called! Add this line of code to the bottom of the __init__ method for both classes:

        self.seq.start()
  6. The second error is a little more...