Model and Shade your Hero/Heroine - Unity 3 Game Development - page 122

Shader programming—Rim light and
toon ramp
In this last step, we will add the last three properies, _RimColor , _RimPower , and _Ramp
to get the toon shader result. The _RimColor and _RimPower properies basically control
the back lighing efect of our character. The _Ramp properies will be the ramp textures
that are used to calculate the lighing efect based on the angle between light direction and
surface normal of the object.
Engage Thrusters
This is the last secion, ater which you will be able to see the result of your custom shader.
1. Go to MonoDevelop, open the MyShader.shader file, and go to the Properties
secion and add the highlighted script as follows:
Properties {
_MainTex ("Texture", 2D) = "white" {}
_BumpMap ("Bumpmap", 2D) = "bump" {}
_AmbientColor ("Ambient Color", Color) = (0.1, 0.1, 0.1, 1.0)
_SpecularColor ("Specular Color", Color) = (0.12, 0.31, 0.47,
1.0)
_Glossiness ("Gloss", Range(1.0,512.0)) = 80.0
_RimColor ("Rim Color", Color) = (0.12, 0.31, 0.47, 1.0)
_RimPower ("Rim Power", Range(0.5,8.0)) = 3.0
_Ramp ("Shading Ramp", 2D) = "gray" {}
}
2. Go to the SubShader secion, modify, and add the highlighted code as follows:
SubShader {
Tags { "RenderType"="Opaque" }
LOD 400
CGPROGRAM
// Custom lighting function that uses a texture ramp based on
angle between light direction and normal
// We use exclude_path:prepass because this lighting model won't
work on the deferred lighting
// Since we don't have the angle between the light direction and
normal to calculate in the prepass
#pragma surface surf RampSpecular exclude_path:prepass
sampler2D _MainTex;