Open
ch5_SimpleAnimation.html
using your WebGL-enabled Internet browser of choice.Move the camera around and see how the objects (sphere and cone) move independently of each other (local transformations) and from the camera position (global transformation).
Move the camera around pressing the left mouse button and holding it while you drag the mouse.
You can also dolly the camera by clicking the left mouse button while pressing the Alt key and then dragging the mouse.
Now change the camera type to Tracking. If for any reason you lose your bearings, click on go home.
Let's examine the source code to see how we have implemented this example. Open
ch5_SimpleAnimation.html
using the source code editor of your choice.Take a look at the functions
startAnimation
,onFrame
, andanimate
. Which timing strategy are we using here?The global variables
pos_sphere
andpos_cone
contain the position of the sphere and the cone respectively. Scroll up to thedraw
function. Inside...
WebGL Beginner's Guide
WebGL Beginner's Guide
Overview of this book
WebGL is a new web technology that brings hardware-accelerated 3D graphics to the browser without installing additional software. As WebGL is based on OpenGL and brings in a new concept of 3D graphics programming to web development, it may seem unfamiliar to even experienced Web developers.Packed with many examples, this book shows how WebGL can be easy to learn despite its unfriendly appearance. Each chapter addresses one of the important aspects of 3D graphics programming and presents different alternatives for its implementation. The topics are always associated with exercises that will allow the reader to put the concepts to the test in an immediate manner.WebGL Beginner's Guide presents a clear road map to learning WebGL. Each chapter starts with a summary of the learning goals for the chapter, followed by a detailed description of each topic. The book offers example-rich, up-to-date introductions to a wide range of essential WebGL topics, including drawing, color, texture, transformations, framebuffers, light, surfaces, geometry, and more. With each chapter, you will "level up"ù your 3D graphics programming skills. This book will become your trustworthy companion filled with the information required to develop cool-looking 3D web applications with WebGL and JavaScript.
Table of Contents (18 chapters)
WebGL Beginner's Guide
Credits
About the Authors
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
Getting Started with WebGL
Rendering Geometry
Lights!
Camera
Action
Colors, Depth Testing, and Alpha Blending
Textures
Picking
Putting It All Together
Advanced Techniques
Index
Customer Reviews