Copied from original lesson at http://learningwebgl.com/blog/?p=1067
Initializing…
Use color map
Use specular map
Use lighting
Point light:
| Location: | X: | Y: | Z: |
| Specular colour: | R: | G: | B: |
| Diffuse colour: | R: | G: | B: |
Ambient light:
| Colour: | R: | G: | B: |
Earth texture courtesy of the European Space Agency/Envisat.