WebGL Beginner's Guide

Time for action – normal mapping in action

1. Open the file ch10_NormalMap.html in an HTML5 browser.
   
2. Rotate the cube to see the effect that the normal map has on how the cube is lit. Also observe how the profile of the cube has not changed. Let's examine how this effect is achieved.
3. First, we need to add a new attribute to our vertex buffers. There are actually three vectors that are needed to calculate the tangent space coordinates that the lighting is calculated in: the normal, the tangent, and bitangent.
   

   We already know what the normal represents, so ...