我正在尝试“合并”两个着色器的代码：
第一个是Microsoft Holotoolkit中Hololens的双面着色器：
// 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Unity资产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的末尾从第二个着色器添加pragma冲浪表面，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
...
但是我遇到以下错误：
Shader Compiler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时发生内部错误。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，意外的$ end，期望TOK_SHADER位于第1行
如果您有任何建议或建议，我将非常感谢，谢谢！
答案 0 :(得分：1)
通常，这归结为您想要实现的目标，并了解哪一部分着色器可以实现最终结果。
这不是很清楚，我只能做一些假设。看来您有给定的网格；您希望根据平面的位置和法线将其（ 1 ）切出；并希望（ 2 ）正面（F）和背面（B）具有不同的渲染属性。
编写多遍着色器通常只是您可以通过设置完成的事情的简写，尽管可能会增加一些开销：每遍本质上是另一个绘制调用，它也可能是另一个对象。
选项：
在任一情况下 2 和 3 ，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，您可以首先编写2个具有烘焙属性的着色器：
Geometry-1，因为它总是需要用F（ront）遮盖。 （请参阅https://docs.unity3d.com/Manual/SL-SubShaderTags.html）Cull Front标志，材料F使用Cull Back标志（默认标志）checkVisibility(IN.worldPos)来丢弃雕刻出来的像素。附带说明：由于您似乎要进行VR操作，因此此操作必须很快，因此我主张使用clip() hlsl指令并让checkVisibility返回一个float，以摆脱它完全有条件分支。