Visualisation of the Phong Shading Model

Sven Havemann, Dieter W. Fellner

show the Phong model: I = kd * ( L*N ) + ks * ( R*V )^a


I	=	light reflected by the surface from one light source
kd	=	diffuse reflection coefficient
ks	=	specular reflection coefficient
a	=	specular exponent, always integer
L	=	light vector, from surface point to light bulb
R	=	light reflection vector, direction of highest intensity
V	=	eye vector, is shown as points on the half sphere
N	=	surface normal vector, shown in blue

The yellow circles indicate unit distance.