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WebGL Beginner's Guide

You're reading from   WebGL Beginner's Guide If you're a JavaScript developer who wants to take the plunge into 3D web development, this is the perfect primer. From a basic understanding of WebGL structure to creating realistic 3D scenes, everything you need is here.

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Product type Paperback
Published in Jun 2012
Publisher Packt
ISBN-13 9781849691727
Length 376 pages
Edition 1st Edition
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Table of Contents (18) Chapters Close

WebGL Beginner's Guide
Credits
About the Authors
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with WebGL FREE CHAPTER 2. Rendering Geometry 3. Lights! 4. Camera 5. Action 6. Colors, Depth Testing, and Alpha Blending 7. Textures 8. Picking 9. Putting It All Together 10. Advanced Techniques Index

Time for action – unique object labels


This section is divided in two parts. In the first part you will develop the code to generate a random scene with cones and cylinders. Each object will be assigned a unique object label that will be used for coloring the object in the offscreen renderbuffer. In the second part, we will configure the picker to work with unique labels. Let's get started!

  1. Creating a random scene: Open the ch8_Picking_Scene_Initial.html file in your HTML5 browser. As you can see this is a scene that is only showing the floor object. We are going to create a scene that contains multiple objects that can be either balls or cylinders.

  2. Open ch8_Picking_Scene_Initial.html in a source code editor.

    We will write code so each object in the scene can have:

    • A position assigned randomly

    • A unique object label color

    • A non-unique diffuse color

    • A scale factor that will determine the size of the object

  3. We have provided empty functions that you will implement in this section.

  4. Let's start by writing...

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