Book Image

jMonkeyEngine 3.0 : Beginner's Guide

Book Image

jMonkeyEngine 3.0 : Beginner's Guide

Overview of this book

jMonkeyEngine 3.0 is a powerful set of free Java libraries that allows you to unlock your imagination, create 3D games and stunning graphics. Using jMonkeyEngine's library of time-tested methods, this book will allow you to unlock its potential and make the creation of beautiful interactive 3D environments a breeze."jMonkeyEngine 3.0 Beginner's Guide" teaches aspiring game developers how to build modern 3D games with Java. This primer on 3D programming is packed with best practices, tips and tricks and loads of example code. Progressing from elementary concepts to advanced effects, budding game developers will have their first game up and running by the end of this book.From basic concepts and project creation to building a complex 3D Game, you will learn to layout 3D scenes, make them interactive and add various multi-media effects.You will find answers to common questions including best practices and approaches, how game characters can act and interact, how to simulate solid walls and physical forces, how to take it online to play over a network and much more.From Zero to Hero, start your journey to make your game idea a reality.
Table of Contents (20 chapters)
jMonkeyEngine 3.0 Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – finding stuff in the scene graph


When you create effects in the SDK, you can add several spatials to one .j3o file. For a campfire, you would add one fire emitter, one smoke emitter, and some wooden logs geometries. After loading the scene, you may want to change the effect properties inside the loaded scene, but how do you access, say, the fire emitter, without a variable?

Use the following approach to find any spatial anywhere in your scene graph:

  1. Make a copy of Main.java and name the class LoadEffectFromJ3o.java. Remember to also refactor the first line of the main() method to LoadEffectFromJ3o app = new LoadEffectFromJ3o();.

  2. Load the .j3o file containing your effect in the simpleInitApp() method, using assetManager, and attach it:

    Node myScene = (Node)assetManager.loadModel("Scenes/FireEffect.j3o");
    rootNode.attachChild(myScene);
  3. Create a custom com.jme3.scene.SceneGraphVisitorAdapter to define search criteria:

    SceneGraphVisitorAdapter myEmitterVisitor = new SceneGraphVisitorAdapter...