Open the file
ch8_Picking.htmlusing your HTML5 Internet browser. You will see a screen similar to this:
Here you have a set of objects, each one of which has a unique diffuse color property. As in the previous exercises you can rotate the camera around the scene. Please notice that the cube has a texture and that the flat disk is translucent. As you may expect, the code in the
drawfunction handles textures coordinates and also transparencies, so it looks a bit more complex than before (you can check it out in the source code). This is a more realisticdrawfunction. In a real application, you will have to handle these variables.Click on the sphere and drag it around the scene. Notice that the object becomes translucent. Also, note that the displacement occurs along the axis of the camera. To make this evident, please go to your web browser's console and type:
camera.setElevation(0);
You will see that the camera updates its position to an elevation of zero degrees...
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.
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WebGL Beginner's Guide
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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