Unity3d "Shader" Custom illumination model

First, the theory

Equation 1: The color formula that the illuminated object eventually renders

Final color = material Color * Glow Color

Equation 2: Material color

tex2d (_MAINTEX,UV)

Equation 3: Light color

Illumination color = Spontaneous light + ambient light + diffuse reflection + specular reflection

Equation 5: Self-illumination

emissive = coloremissive

Coloremissive Self-luminous colors

Equation 6: Ambient light

Ambient= ka*colorambient

Ka Ambient light factor

Colorambient Ambient light Color

Equation 7: Diffuse reflection light

Diffuse=kd*colorlight*max (dot (n,l), 0)

Kd Diffuse reflectance coefficient

Colorlight Light Color

N normal vector

L Light Source Direction

Equation 8: Specular reflection

Specular reflection: light to the surface smooth, normal uniform surface of the object, this reflected light is called specular reflection light. Ks Mirror coefficient colorlight The color of the light n unit normal vector L is the unit vector of the light source from the point to the units of the observer's unit vector H (l+v) vector, i.e. normalize (l+v) shininess Specular strength coefficient, the smaller the value, the more diffuse the high light, the higher the value, the more concentrated the high light. Facing if the dot multiplication of N and L is greater than 0, then facing is 1 and if less than or equal to 0, then facing is 0

Unity3d "Shader" Custom illumination model