WebGL Beginner's Guide - Chapter 3

Goraud Shading + Phong Reflection Model

Final Color = Ia + Id + Is

Light Color (Light Diffuse Term):			Sphere Color (Material Diffuse Term):
Light Ambient Term:	0.03		Material Ambient Term:	1.0
Light Specular Term:	1.0		Material Specular Term:	1.0
X:	-0.25		Shininess:	10.0
Y:	-0.25		Background Color (gl.clearColor):
Z:	-0.25

This model has three terms:

• Ia: ambient term
• Id: diffuse term
• Is: specular term

However, the diffusive and specular terms are only taken into account if the Lambert term is larger than zero.

In this case: I = Ia + Id + Is, otherwise (Lambert term <= 0):I = Ia