将表面着色器转换为片段着色器

Question

寻找将表面着色器转换为片段着色器的帮助。最终将纹理渲染到Unity3D Rendertexture。谢谢！

表面着色器输出噪声和基于https://scrawkblog.com/2013/05/18/gpu-gems-to-unity-improved-perlin-noise/

这是我期待转换的表面材质：从reddit的

Shader "Noise/Diffuse3D" 
{ 
Properties 
{ 
    _MainTex ("Base (RGB)", 2D) = "white" {} 
    _Color("Color", Color) = (1,1,1,1) 
} 
SubShader 
{ 
    Tags { "RenderType"="Opaque" } 
    LOD 200 

    CGPROGRAM 
    #pragma surface surf Lambert vertex:vert 
    #pragma target 3.0 
    #pragma glsl 
    #include "ImprovedPerlinNoise3D.cginc" 

    sampler2D _MainTex; 
    fixed4 _Color; 

    struct Input 
    { 
     float2 uv_MainTex; 
     float3 noiseUV; 
    }; 

    void vert(inout appdata_full v, out Input o) 
    { 
     UNITY_INITIALIZE_OUTPUT(Input,o); 
     //o.noiseUV = v.vertex.xyz; //use model space, not world space for noise uvs 
            // v.vertex is the input vertex in the vertex shader 
     //float3 worldPos = mul(_Object2World, v.vertex).xyz; 
     o.noiseUV = mul(_Object2World, v.vertex).xyz; 

    } 

    void surf(Input IN, inout SurfaceOutput o) 
    { 
     //uncomment this for fractal noise 
     //float n = fBm(IN.noiseUV, 4); 

     //uncomment this for turbulent noise 
     float n = turbulence(IN.noiseUV, 4); 

     //uncomment this for ridged multi fractal 
     //float n = ridgedmf(IN.noiseUV, 4, 1.0); 

     o.Albedo = _Color.rgb * n; 
     o.Alpha = _Color.a; 
    } 
    ENDCG 
} 
FallBack "Diffuse" 
} 

Answer 1

答：

Pass 
{ 
    CGPROGRAM 
    #pragma vertex vert 
    #pragma fragment frag 
    #pragma target 3.0 
    #pragma glsl 
    #include "ImprovedPerlinNoise3D.cginc" 
    #pragma multi_compile_fog 

    #include "UnityCG.cginc" 

    struct appdata 
    { 
     float4 vertex : POSITION; 
    }; 

    struct v2f 
    { 
     float3 noiseUV : TEXCOORD0; 
     UNITY_FOG_COORDS(1) 
     float4 vertex : SV_POSITION; 
    }; 

    fixed4 _Color; 
    v2f vert (appdata v) 
    { 
     v2f o; 
     UNITY_INITIALIZE_OUTPUT(v2f,o); 
     o.vertex = mul(UNITY_MATRIX_MVP, v.vertex); 
     o.noiseUV = mul(_Object2World, v.vertex).xyz; 
     UNITY_TRANSFER_FOG(o,o.vertex); 
     return o; 
    } 

    fixed4 frag (v2f i) : SV_Target 
    { 

     //uncomment this for fractal noise 
     //float n = fBm(i.noiseUV, 4); 

     //uncomment this for turbulent noise 
     float n = turbulence(i.noiseUV, 4); 

     //uncomment this for ridged multi fractal 
     //float n = ridgedmf(i.noiseUV, 4, 1.0); 
     fixed4 col = _Color; 
     col.rgb*=n; 
     UNITY_APPLY_FOG(i.fogCoord, col); 
     return col; 
    } 
    ENDCG 
} 
} 
FallBack "Diffuse"