头发高光效果及金属表面shader

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晃晃

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电梯直达

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发表于 2011-8-26 08:38:15 |只看该作者 |倒序浏览

这个shader可以用来做头发调光及金属表面效果，下面是代码：

Shader "Bumped Anisotropic Specular" {
   Properties {
      _Color ("Main Color", Color) = (1,1,1,1)
      _MainTex ("Diffuse (RGB) Alpha (A)", 2D) = "white" {}
      _SpecularTex ("Specular (R) Gloss (G) Anisotropic Mask (B)", 2D) = "gray" {}
      _BumpMap ("Normal (Normal)", 2D) = "bump" {}
      _AnisoTex ("Anisotropic Direction (RGB)", 2D) = "bump" {}
      _AnisoOffset ("Anisotropic Highlight Offset", Range(-1,1)) = -0.2
      _Cutoff ("Alpha Cut-Off Threshold", Range(0,1)) = 0.5
   }

   SubShader{
      Tags { "RenderType" = "Opaque" }

      CGPROGRAM

            s***ct SurfaceOutputAniso {
               fixed3 Albedo;
               fixed3 Normal;
               fixed4 AnisoDir;
               fixed3 Emission;
               half Specular;
               fixed Gloss;
               fixed Alpha;
            };

            float _AnisoOffset, _Cutoff;
            inline fixed4 LightingAniso (SurfaceOutputAniso s, fixed3 lightDir, fixed3 viewDir, fixed atten)
            {
               fixed3 h = normalize(normalize(lightDir) + normalize(viewDir));
               float NdotL = saturate(dot(s.Normal, lightDir));

               fixed HdotA = dot(normalize(s.Normal + s.AnisoDir.rgb), h);
               float aniso = max(0, sin(radians((HdotA + _AnisoOffset) * 180)));

               float spec = saturate(dot(s.Normal, h));
               spec = saturate(pow(lerp(spec, aniso, s.AnisoDir.a), s.Gloss * 128) * s.Specular);

               fixed4 c;
               c.rgb = ((s.Albedo * _LightColor0.rgb * NdotL) + (_LightColor0.rgb * spec)) * (atten * 2);
               c.a = 1;
               clip(s.Alpha - _Cutoff);
               return c;
            }

            #pragma surface surf Aniso
            #pragma target 3.0

            s***ct Input
            {
               float2 uv_MainTex;
               float2 uv_AnisoTex;
            };

            sampler2D _MainTex, _SpecularTex, _BumpMap, _AnisoTex;

            void surf (Input IN, inout SurfaceOutputAniso o)
            {
               fixed4 albedo = tex2D(_MainTex, IN.uv_MainTex);
               o.Albedo = albedo.rgb;
               o.Alpha = albedo.a;
               o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_MainTex));
               fixed3 spec = tex2D(_SpecularTex, IN.uv_MainTex).rgb;
               o.Specular = spec.r;
               o.Gloss = spec.g;
               o.AnisoDir = fixed4(tex2D(_AnisoTex, IN.uv_AnisoTex).rgb, spec.b);
            }
      ENDCG
   }
   FallBack "Transparent/Cutout/VertexLit"
}