Book Image

WebGL Beginner's Guide

Book Image

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
Index

Time for action – blending workbench


  1. Open the file ch6_Blending.html in your HTML5 Internet browser. You will see an interface like the one shown in the following screenshot:

  2. This interface has most of the parameters that allow you to configure alpha blending. The settings by default are source: gl.SRC_ALPHA and destination: gl.ONE_MINUS_SRC_ALPHA. These are the parameters for interpolative blending. Which slider do you need to use in order to change the scaling factor for interpolative blending? Why?

  3. Change the sphere alpha slider to 0.5. You will see some shadow-like artifacts on the surface of the sphere. This occurs because the sphere back face is now visible. To get rid of the back face click on Back Face Culling.

  4. Click on the Reset button.

  5. Disable the Lambert Term and Floor buttons.

  6. Enable the Back Face Culling button.

  7. Let's implement multiplicative blending. What values do source and destination need to have?

  8. Click-and-drag on the canvas. Check that the multiplicative blending create dark...