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我正在尝试“合并”两个着色器的代码：

第一个是来自 Microsoft Holotoolkit 的 Hololens 双面着色器：

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.

Shader "MixedRealityToolkit/Obsolete/Fast Configurable 2 Sided"
{
    Properties
    {
        _Mode("Rendering Mode", Float) = 0.0

        [Toggle] _UseVertexColor("Vertex Color Enabled?", Float) = 0
        [Toggle] _UseMainColor("Main Color Enabled?", Float) = 0
        _Color("Main Color", Color) = (1,1,1,1)
        [Toggle] _UseMainTex("Main Texture Enabled?", Float) = 0
        [NoScaleOffset]_MainTex("Main Texture", 2D) = "red" {}

        [Toggle] _UseOcclusionMap("Occlusion/Detail Texture Enabled?", Float) = 0
        [NoScaleOffset]_OcclusionMap("Occlusion/Detail Texture", 2D) = "blue" {}

        [Toggle] _UseAmbient("Ambient Lighting Enabled?", Float) = 1
        [Toggle] _UseDiffuse("Diffuse Lighting Enabled?", Float) = 1

        [Toggle] _SpecularHighlights("Specular Lighting Enabled?", Float) = 0
        [Toggle] _Shade4("Use additional lighting data? (Expensive!)", Float) = 0

        [Toggle] _ForcePerPixel("Light per-pixel (always on if a map is set)", Float) = 0

        _SpecColor("Specular Color", Color) = (0.5, 0.5, 0.5, 1)
        [PowerSlider(5.0)]_Specular("Specular (Specular Power)", Range(1.0, 100.0)) = 10.0
        [Toggle] _UseSpecularMap("Use Specular Map? (per-pixel)", Float) = 0
        [NoScaleOffset]_SpecularMap("Specular Map", 2D) = "white" {}

        _Gloss("Gloss (Specular Scale)", Range(0.1, 10.0)) = 1.0
        [Toggle] _UseGlossMap("Use Gloss Map? (per-pixel)", Float) = 0
        [NoScaleOffset]_GlossMap("Gloss Map", 2D) = "white" {}

        [Toggle] _UseBumpMap("Normal Map Enabled? (per-pixel)", Float) = 0
        [NoScaleOffset][Normal] _BumpMap("Normal Map", 2D) = "bump" {}

        [Toggle] _UseReflections("Reflections Enabled?", Float) = 0
        [NoScaleOffset]_CubeMap("CubeMap", Cube) = "" {}
        _ReflectionScale("Reflection Scale", Range(0.01, 3.0)) = 2.0
        [Toggle]_CalibrationSpaceReflections("Reflect in calibration space?", Float) = 0

        [Toggle] _UseRimLighting("Rim Lighting Enabled?", Float) = 0
        [PowerSlider(.6)]_RimPower("Power", Range(0.1, 1.0)) = 0.7
        _RimColor("Color", Color) = (1,1,1,1)

        [Toggle] _UseEmissionColor("Emission Color Enabled?", Float) = 0
        _EmissionColor("Emission Color", Color) = (1,1,1,1)
        [Toggle] _UseEmissionMap("Emission Map Enabled?", Float) = 0
        [NoScaleOffset] _EmissionMap("Emission Map", 2D) = "blue" {}

        _TextureScaleOffset("Texture Scale (XY) and Offset (ZW)", Vector) = (1, 1, 0, 0)

        [Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend("SrcBlend", Float) = 1 //"One"
        [Enum(UnityEngine.Rendering.BlendMode)] _DstBlend("DestBlend", Float) = 0 //"Zero"
        [Enum(UnityEngine.Rendering.BlendOp)] _BlendOp("BlendOp", Float) = 0 //"Add"

        [Toggle] _AlphaTest("Alpha test enabled?", Float) = 0
        _Cutoff("Alpha Cutoff", Range(-0.1, 1.0)) = -0.1

        [Enum(UnityEngine.Rendering.CompareFunction)] _ZTest("ZTest", Float) = 4 //"LessEqual"
        [Enum(Off,0,On,1)] _ZWrite("ZWrite", Float) = 1 //"On"
        [Enum(UnityEngine.Rendering.ColorWriteMask)] _ColorWriteMask("ColorWriteMask", Float) = 15 //"All"
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" "PerformanceChecks"="False" }
        LOD 100
        Blend[_SrcBlend][_DstBlend]
        BlendOp[_BlendOp]
        ZTest[_ZTest]
        ZWrite[_ZWrite]

        Pass
        {
            Name "FRONT"
            Tags { "LightMode" = "ForwardBase" }
            Cull Back
            ColorMask[_ColorWriteMask]

            CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag

                //compiles all variants needed by ForwardBase (forward rendering base) pass type. The variants deal with different lightmap types and main directional light having shadows on or off.
                #pragma multi_compile_fwdbase

                //expands to several variants to handle different fog types
                #pragma multi_compile_fog

                //We only target the HoloLens (and the Unity editor), so take advantage of shader model 5.
                #pragma target 5.0
                #pragma only_renderers d3d11

                //shader features are only compiled if a material uses them
                #pragma shader_feature _USEVERTEXCOLOR_ON
                #pragma shader_feature _USEMAINCOLOR_ON
                #pragma shader_feature _USEMAINTEX_ON
                #pragma shader_feature _USESOCCLUSIONMAP_ON
                #pragma shader_feature _USEBUMPMAP_ON
                #pragma shader_feature _USEAMBIENT_ON
                #pragma shader_feature _USEDIFFUSE_ON
                #pragma shader_feature _USESPECULAR_ON
                #pragma shader_feature _USEGLOSSMAP_ON
                #pragma shader_feature _SHADE4_ON
                #pragma shader_feature _USEREFLECTIONS_ON
                #pragma shader_feature _USERIMLIGHTING_ON
                #pragma shader_feature _USEEMISSIONCOLOR_ON
                #pragma shader_feature _USEEMISSIONTEX_ON
                #pragma shader_feature _ALPHATEST_ON

                //scale and offset will apply to all
                #pragma shader_feature _MainTex_SCALE_ON
                #pragma shader_feature _MainTex_OFFSET_ON

                //may be set from script so generate both paths
                #pragma multi_compile __ _NEAR_PLANE_FADE_ON

                #include "FastConfigurable.cginc"           
            ENDCG
        }

        Pass
        {
            Name "BACK"
            Tags{ "LightMode" = "ForwardBase" }
            Cull Front
            ColorMask[_ColorWriteMask]

            CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag

                //compiles all variants needed by ForwardBase (forward rendering base) pass type. The variants deal with different lightmap types and main directional light having shadows on or off.
                #pragma multi_compile_fwdbase

                //expands to several variants to handle different fog types
                #pragma multi_compile_fog

                //We only target the HoloLens (and the Unity editor), so take advantage of shader model 5.
                #pragma target 5.0
                #pragma only_renderers d3d11

                //shader features are only compiled if a material uses them
                #pragma shader_feature _USEMAINCOLOR_ON
                #pragma shader_feature _USEMAINTEX_ON
                #pragma shader_feature _USESOCCLUSIONMAP_ON
                #pragma shader_feature _USEBUMPMAP_ON
                #pragma shader_feature _USEAMBIENT_ON
                #pragma shader_feature _USEDIFFUSE_ON
                #pragma shader_feature _USESPECULAR_ON
                #pragma shader_feature _USEGLOSSMAP_ON
                #pragma shader_feature _SHADE4_ON
                #pragma shader_feature _USEEMISSIONCOLOR_ON
                #pragma shader_feature _USEEMISSIONTEX_ON

                //scale and offset will apply to all
                #pragma shader_feature _MainTex_SCALE_ON
                #pragma shader_feature _MainTex_OFFSET_ON

                //may be set from script so generate both paths
                #pragma multi_compile __ _NEAR_PLANE_FADE_ON

                #define FLIP_NORMALS 1
                #include "FastConfigurable.cginc"
            ENDCG
        }
    } 

    CustomEditor "HoloToolkit.Unity.FastConfigurable2SidedGUI"
    Fallback "VertexLit" //for shadows
}

第二个是来自 Unity 资源商店的横截面着色器：

Shader "CrossSection/OnePlaneBSP" {
    Properties{
        _Color("Color", Color) = (1,1,1,1)
        _CrossColor("Cross Section Color", Color) = (1,1,1,1)
        _MainTex("Albedo (RGB)", 2D) = "white" {}
        _Glossiness("Smoothness", Range(0,1)) = 0.5
        _Metallic("Metallic", Range(0,1)) = 0.0
        _PlaneNormal("PlaneNormal",Vector) = (0,1,0,0)
        _PlanePosition("PlanePosition",Vector) = (0,0,0,1)
        _StencilMask("Stencil Mask", Range(0, 255)) = 255
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        //LOD 200
        Stencil
        {
            Ref [_StencilMask]
            CompBack Always
            PassBack Replace

            CompFront Always
            PassFront Zero
        }
        Cull Back
            CGPROGRAM
            // Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard fullforwardshadows

            // Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0

            sampler2D _MainTex;

        struct Input {
            float2 uv_MainTex;

            float3 worldPos;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
        fixed4 _CrossColor;
        fixed3 _PlaneNormal;
        fixed3 _PlanePosition;
        bool checkVisability(fixed3 worldPos)
        {
            float dotProd1 = dot(worldPos - _PlanePosition, _PlaneNormal);
            return dotProd1 > 0  ;
        }
        void surf(Input IN, inout SurfaceOutputStandard o) {
            if (checkVisability(IN.worldPos))discard;
            fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            // Metallic and smoothness come from slider variables
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG

            Cull Front
            CGPROGRAM
#pragma surface surf NoLighting  noambient

        struct Input {
            half2 uv_MainTex;
            float3 worldPos;

        };
        sampler2D _MainTex;
        fixed4 _Color;
        fixed4 _CrossColor;
        fixed3 _PlaneNormal;
        fixed3 _PlanePosition;
        bool checkVisability(fixed3 worldPos)
        {
            float dotProd1 = dot(worldPos - _PlanePosition, _PlaneNormal);
            return dotProd1 >0 ;
        }
        fixed4 LightingNoLighting(SurfaceOutput s, fixed3 lightDir, fixed atten)
        {
            fixed4 c;
            c.rgb = s.Albedo;
            c.a = s.Alpha;
            return c;
        }

        void surf(Input IN, inout SurfaceOutput o)
        {
            if (checkVisability(IN.worldPos))discard;
            o.Albedo = _CrossColor;

        }
            ENDCG

    }
    //FallBack "Diffuse"
}

我尝试从双面着色器开始，并在第一个 PASS 的末尾从第二个添加 pragma surf 表面，如下所示：

...
//End of the first PASS from the first shader


        #include "FastConfigurable.cginc"       



#pragma surface surf NoLighting  noambient


        struct Input {
            half2 uv_MainTex;
            float3 worldPos;

        };
        fixed4 _CrossColor;
        fixed3 _PlaneNormal;
        fixed3 _PlanePosition;
        bool checkVisability(fixed3 worldPos)
        {
            float dotProd1 = dot(worldPos - _PlanePosition, _PlaneNormal);
            return dotProd1 > 0;
        }
        fixed4 LightingNoLighting(SurfaceOutput s, fixed3 lightDir, fixed atten)
        {
            fixed4 c;
            c.rgb = s.Albedo;
            c.a = s.Alpha;
            return c;
        }

        void surf(Input IN, inout SurfaceOutput o)
        {
            if (checkVisability(IN.worldPos))discard;
            o.Albedo = _CrossColor;

        }
            ENDCG
        }


        Pass
        {
            Name "BACK"
            Tags{ "LightMode" = "ForwardBase" }
            Cull Front
            ColorMask[_ColorWriteMask]

            CGPROGRAM
//Next of the second PASS of the first shader
...

但我收到以下错误：

着色器编译器套接字异常：终止着色器编译器进程

着色器编译器：预处理 DoubleSidedStandardCrossCut.shader：与着色器编译器进程通信的内部错误。请报告包含此着色器和编辑器日志的错误。

“DoubleSidedStandardCrossCut”中的着色器错误：解析错误：语法错误，意外 $end，在第 1 行期待 TOK_SHADER

如果您有任何提示或建议，我将不胜感激，谢谢！

4

1 回答 1

1

通常，这归结为您想要实现的目标，并了解哪个着色器的哪个部分在您的最终结果中实现了您想要的效果。

这不是很清楚，我只能做出假设。看来您有给定的网格；你希望它可以（1）基于一个平面雕刻出来，给定它的位置和法线；并且希望 ( 2 )正面 (F) 和背面 (B)表面具有不同的渲染属性。

编写多通道着色器通常只是您可以通过设置完成的操作的简写，尽管可能需要更多开销：每个通道本质上是另一个绘制调用，它也可以是另一个对象。

选项：

  1. 编写多通道着色器
  2. 将 2 个对象嵌套在一个公共变换中，或者将对象 F 或 B 嵌套到另一个对象中。
  3. 如果您的网格没有子网格，请将 2 个材质分配给 MeshRenderer 组件。此列表通常为每个子网格分配不同的材质，但如果不存在，它将再次绘制网格。

在第 2和第 3种情况下，您需要2 种材料。它们都可以使用相同的着色器，或者为简单起见，您可以首先创建 2 个具有烘焙属性的着色器：

  • 材质 B(ack) 具有较低的渲染队列（可能Geometry-1），因为它总是需要被 F(ront) 覆盖。（见https://docs.unity3d.com/Manual/SL-SubShaderTags.html）
  • 材质B使用Cull Frontflag，材质F使用Cull Backflag（默认一个）
  • 它们都用于checkVisibility(IN.worldPos)丢弃被雕刻出来的像素。

附带说明：这需要很快，因为您似乎在做 VR，所以我提倡使用clip()hlsl 指令并且必须checkVisibility返回一个浮点数，以完全摆脱条件分支。

于 2019-05-27T10:21:03.360 回答