Unity3D

使用渐变纹理来控制漫反射控制。

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'Shader "Unity Shaders Book/Chapter 7/Ramp Texture" {    Properties {        _Color("Color Tint", Color) = (1,1,1,1)        _RampTex("Ramp Tex", 2D) = "white" {}        _Specular("Specular", Color) = (1,1,1,1)        _Gloss("Gloss", Range(8.0, 256)) = 20    }    SubShader {        Pass {            Tags {"LightMode" = "ForwardBase"}            CGPROGRAM            #pragma vertex vert            #pragma fragment frag            #include "Lighting.cginc"            fixed4 _Color;            sampler2D _RampTex;            // 渐变纹理属性            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;            };            v2f vert(a2v v) {                v2f o;                o.pos = UnityObjectToClipPos(v.vertex);                o.worldNormal = UnityObjectToWorldNormal(v.normal);                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;                // #define TRANSFORM_TEX(tex,name) (tex.xy * name##_ST.xy + name##_ST.zw)                o.uv = TRANSFORM_TEX(v.texcoord, _RampTex);                return o;            }            fixed4 frag(v2f i) : SV_Target {                fixed3 worldNormal = normalize(i.worldNormal);                fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));                fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;                // Use the texture to sample the diffuse color                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 (max(0, dot(worldNormal, halfDir)), _Gloss);                return fixed4(ambient + diffuse + specular, 10);            }            ENDCG        }    }    FallBack "Diffuse"}