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 – trying different filter modes


  1. Open the file ch7_Texture_Filters.html using your HTML5 Internet browser:

  2. The controls along the bottom include a slider to adjust the distance of the box from the viewer, and the buttons modify the magnification and minification filters.

  3. Experiment with different modes to observe the effect they have on the texture. Magnification filters take effect when the cube is closer, minification filters when it is further away. Be sure to rotate the cube as well and observe what the texture looks like when viewed at an angle with each mode.

What just happened?

Let's look at each of the filter modes in depth, and discuss how they work.

NEAREST

Textures using the NEAREST filter always return the color of the texel whose center is nearest to the sample point. Using this mode textures will look blocky and pixilated when viewed up close, which can be useful for creating "retro" graphics. NEAREST can be used for both MIN and MAG filters.

LINEAR

The LINEAR filter...