Use a programmable rendering pipeline to implement the phone Illumination Model

Ambient Lighting = Ca*[Ga + sum(Atti*Spoti*Lai)] 

Where:

Parameter	Default Value	Type	Description
CA	(0, 0, 0)	D3dcolorvalue	Material ambient color
GA	(0, 0, 0)	D3dcolorvalue	Global ambient color
Atteni	(0, 0, 0)	D3dcolorvalue	Light attenuation of the ith light. See attenuation and spotlight factor (direct3d 9 ).
Spoti	(0, 0, 0)	D3dvector	Spotlight factor of the ith light. SeeAttenuation and spotlight factor (direct3d 9).
Sum	N/	N/	Sum of the ambient light
Lai	(0, 0, 0)	D3dvector	Light ambient color of the ith light

Diffuse Lighting = sum[Cd*Ld*(N.Ldir)*Atten*Spot]

Parameter	Default Value	Type	Description
Sum	N/	N/	Summation of each light's diffuse component.
CD	(0, 0, 0)	D3dcolorvalue	Diffuse color.
LD	(0, 0, 0)	D3dcolorvalue	Light diffuse color.
N	N/	D3dvector	Vertex normal
Ldir	N/	D3dvector	Direction vector from object vertex to the light.
Atten	N/	Float	Light attenuation. See attenuation and spotlight factor (direct3d 9 ).
Spot	N/	Float	Spotlight factor. SeeAttenuation and spotlight factor (direct3d 9).

Specular lighting = cs * sum [ls * (N • H) p * atten * Spot]

The following table identifies the variables, their types, and their ranges.

Parameter	Default Value	Type	Description
CS	(0, 0, 0)	D3dcolorvalue	Specular color.
Sum	N/	N/	Summation of each light's specular component.
N	N/	D3dvector	Vertex normal.
H	N/	D3dvector	Half way vector. See the section on the halfway vector.
P	0.0	Float	Specular reflection power. range is 0 to + infinity
Ls	(0, 0, 0)	D3dcolorvalue	Light specular color.
Atten	N/	Float	Light attenuation value. See attenuation and spotlight factor (direct3d 9 ).
Spot	N/	Float	Spotlight factor. SeeAttenuation and spotlight factor (direct3d 9).

Float4x4 matviewprojection; Float4 light_position; Float4 light_attenuation; Float4 light_color; Float4 ambient_color; Float4 vviewposition; Float Alpha; Struct vs_input { Float4 position: position0; Float3 normal: normal0; Float2 texcoord: texcoord0; }; Struct vs_output { Float4 position: position0; Float2 texcoord: texcoord0; Float4 color: color0; }; Float4 pointlighting (float3 position, float3 normal , Float3 eyedir, float4 Ambient , Float3 lightpos, float3 lightatt, float4 lightcolor) { Float3 lightdir = normalize (position-lightpos ); Float3 Dis = distance (Position, lightpos ); Float disatt = saturate (1/(lightatt. x + lightatt. y * DIS + lightatt. z * Dis )); Float angleatt = saturate (-lightdir * normal ); Float3 reflectdir = normalize (reflect (lightdir, normal )); Float specularatt = POW (saturate (reflectdir * eyedir), alpha ); Return ambient + lightcolor * disatt * (angleatt + specularatt ); } Vs_output vs_main (vs_input input) { Vs_output output; Output. Position = MUL (input. Position, matviewprojection ); Output. texcoord = input. texcoord; Float3 eyedir = normalize (vviewposition-input. position ); Output. Color = pointlighting (input. Position, input. Normal , Eyedir, ambient_color , Light_position, light_attenuation, light_color ); Return (output ); }