Shader"Unity Shaders Book/Chapter 7/Ramp Texture"{
Properties
{
_Color ("Color Tint", Color) = (1,1,1,1)
//"White是内置纹理名字，即全白纹理，{}是初始值" _RampTex("Ramp Text", 2D) = "white" {}
_Specular ("Specular", Color) = (1,1,1,1)
_Gloss ("Gloss", Range(8.0, 256)) = 20
}
SubShader
{
Pass
{
Tags{"LightMode" = "ForwardBase"}
CGPROGRAM
#pragmavertex vert #pragmafragment frag #include "LIghting.cginc" fixed4 _Color;
sampler2D _RampTex;
//定义_RampTex的纹理属性变量 float4 _RampTex_ST;
fixed4 _Specular;
float _Gloss;
struct a2v
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float4 texcoord : TEXCOORD0;
};
struct v2f
{
float4 pos : SV_POSITION;
float3 worldNormal : TEXCOORD0;
float3 worldPos : TEXCOORD1;
float2 uv : TEXCOORD2;
};
v2fvert(a2v v){
v2f o;
o.pos = UnityObjectToClipPos(v.vertex);
o.worldNormal = UnityObjectToWorldNormal(v.normal);
o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
//使用内置宏TRANSFORM_TEX(顶点纹理坐标，纹理名)计算经过平铺和偏移后的纹理坐标 o.uv = TRANSFORM_TEX(v.texcoord, _RampTex);
return o;
}
fixed4frag(v2f i) : SV_Target{
fixed3 worldNormal = normalize(i.worldNormal);
fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz ;
//使用半兰伯特模型构建一个纹理坐标，使用此坐标对渐变纹理进行采样，uv方向都使用半兰博特，最后将渐变纹理与材质纹理相乘 fixed halfLambert = 0.5 * dot(worldNormal, worldLightDir) + 0.5;
fixed3 diffuseColor = tex2D(_RampTex, fixed2(halfLambert, halfLambert)).rgb * _Color.rgb;
fixed3 diffuse = _LightColor0.rgb * diffuseColor;
fixed3 viewDir = normalize(UnityWorldSpaceViewDir(i.worldPos));
fixed3 halfDir = normalize(worldLightDir + viewDir);
fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(saturate(dot(worldNormal,halfDir)), _Gloss);
return fixed4(ambient + diffuse + specular,1.0);
; }
ENDCG
}
}
Fallback"Specular"}
