Tri-planar Terrain (二) 错误修正 - 图形学 - Unity3D | Jiaying's Note = CWHISME = 人不能没有梦想，也要有足够的敬畏

# 前言

离正式辞职，已经过去半个多月了吧。这些天埋头苦干，自己的 “游戏” 基本功能算是完成得差不了，就目前而言，应该就还差场景、AI 以及剧情了。随着日子不断过去，心里似乎也变的有些焦虑了起来 —— 本来我以为自己是不会出现这样的心理的，不过一直待着吃老本，果然是越待越不淡定了。真想马上还是去把工作找了...... 不过想想，之前自己可貌似定下了 “雄心壮志” 一般的想法计划，怎么着，也得弄出个可玩的吧？

今天下午准备先画一下场景了，把该用的地形贴图都 assign 上去，然后画了几笔.... 我去，除了前四张贴图，该花的花，该黑的黑，Shader 上的 Texture Scale 也没用了... 虽然之前 “偷懒” 的时候就早已有了心理准备（Unity 的地形 Shader 具有 -base、-FirstPass、AddPass 三个组成的，之前我的那个地形 Shader，只有一份代码，就相当于只写了一个 FirstPass），虽然做其它功能的时候，就已经发现远处的贴图变成红色的了，不过那会儿也没在意。

但如今可不行了，若是只有前四张地形贴图可以用 Tripanar，又有何意义？于是没办法，怕麻烦也得继续该改了。

# 简介

关于介绍的 Triplanar 相关的就不多说了，上次的文章应该写了不少。

这次只是在前文的基础上，添加 AddPass Shader 用于处理超出 4 张地形贴图的情况，以及添加 base Shader 处理超出 Terrain base map dist 的情况。

关于 Base shader 好说，因为不必做出什么处理，用正常模型的算法都行 —— 因为太远了，能把贴图显示一下也就差不多了。或者直接使用 Unity 的 Base Shader 都可以，这儿我就直接使用 Unity 的了。

然后是 AddPass Shader.

地形的 AddPadd Shader 跟普通 Shader 的 AddPass 貌似功能上差不多，都是为了负责渲染前一个 Pass 没法渲染的东西 —— 比如普通 Shader 中额外处理点光源之类的。

所以，这个 Pass 的算法，基本上与前一个 Pass 保持一致，只是因为处理对象不同，会有那么一丢丢的改动。

# 效果

为了表示比较，再上一张使用内置的 Standard Terrain Shader 的效果吧：

内置Shader效果

# 代码

完整代码已上传至 Github，地址：https://github.com/CWHISME/Unity3D-Tripanar-Terrain-Shader

# Base

So，先看看最简单的 Base Shader 吧：

	Shader "Hidden/TerrainEngine/Splatmap/TriplanarTerrain-Base" {
	Properties {
	_MainTex ("Base (RGB) Smoothness (A)", 2D) = "white" {}
	_MetallicTex ("Metallic (R)", 2D) = "white" {}

	// used in fallback on old cards
	_Color ("Main Color", Color) = (1,1,1,1)
	}

	SubShader {
	Tags {
	"RenderType" = "Opaque"
	"Queue" = "Geometry-100"
	}
	LOD 200

	CGPROGRAM
	#pragma surface surf Standard fullforwardshadows
	#pragma target 3.0
	// needs more than 8 texcoords
	#pragma exclude_renderers gles
	#include "UnityPBSLighting.cginc"

	sampler2D _MainTex;
	sampler2D _MetallicTex;

	struct Input {
	float2 uv_MainTex;
	};

	void surf (Input IN, inout SurfaceOutputStandard o) {
	half4 c = tex2D (_MainTex, IN.uv_MainTex);
	o.Albedo = c.rgb;
	o.Alpha = 1;
	o.Smoothness = c.a;
	o.Metallic = tex2D (_MetallicTex, IN.uv_MainTex).r;
	}

	ENDCG
	}

	FallBack "Diffuse"
	}

嘛.... 就是 Unity 的，而且很简单，跟普通 Shader 都差不多，没什么可解释的。

# FirstPass

	// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

	//2016.11.18 by cwhisme
	//Note: 在基于 Unity Buildin Terrain Shader 的基础上修改
	//Unity 内置的地形 shader 可以在官方网站上进行下载
	// 加入了 Triplanar 计算，避免贴图拉伸问题

	//Updarte 2016.12.15
	// 替换部分内置代码，并添加对 AddPass 与 Base Shader 的引用
	// 以提供四张贴图以上的支持，及超出 Base Map Dis 之后贴图变红问题

	Shader "CWHISME/TriplannarTerrain"
	{
	Properties{
	// set by terrain engine
	[HideInInspector] _Control("Control (RGBA)", 2D) = "red" {}
	[HideInInspector] _Splat3("Layer 3 (A)", 2D) = "white" {}
	[HideInInspector] _Splat2("Layer 2 (B)", 2D) = "white" {}
	[HideInInspector] _Splat1("Layer 1 (G)", 2D) = "white" {}
	[HideInInspector] _Splat0("Layer 0 (R)", 2D) = "white" {}
	[HideInInspector] _Normal3("Normal 3 (A)", 2D) = "bump" {}
	[HideInInspector] _Normal2("Normal 2 (B)", 2D) = "bump" {}
	[HideInInspector] _Normal1("Normal 1 (G)", 2D) = "bump" {}
	[HideInInspector] _Normal0("Normal 0 (R)", 2D) = "bump" {}
	[HideInInspector][Gamma] _Metallic0("Metallic 0", Range(0.0, 1.0)) = 0.0
	[HideInInspector][Gamma] _Metallic1("Metallic 1", Range(0.0, 1.0)) = 0.0
	[HideInInspector][Gamma] _Metallic2("Metallic 2", Range(0.0, 1.0)) = 0.0
	[HideInInspector][Gamma] _Metallic3("Metallic 3", Range(0.0, 1.0)) = 0.0
	[HideInInspector] _Smoothness0("Smoothness 0", Range(0.0, 1.0)) = 1.0
	[HideInInspector] _Smoothness1("Smoothness 1", Range(0.0, 1.0)) = 1.0
	[HideInInspector] _Smoothness2("Smoothness 2", Range(0.0, 1.0)) = 1.0
	[HideInInspector] _Smoothness3("Smoothness 3", Range(0.0, 1.0)) = 1.0

	// used in fallback on old cards & base map
	[HideInInspector] _MainTex("BaseMap (RGB)", 2D) = "white" {}
	[HideInInspector] _Color("Main Color", Color) = (1,1,1,1)

	_TextureScale("Texture Scale",float) = 100
	_TriplanarBlendSharpness("Triplanar Blend Sharpness",float) = 1
	}

	SubShader{
	Tags{
	"SplatCount" = "10"
	"Queue" = "Geometry-100"
	"RenderType" = "Opaque"
	}

	CGPROGRAM
	#pragma surface surf Standard vertex:vert finalcolor:SplatmapFinalColor finalprepass:SplatmapFinalPrepass finalgbuffer:SplatmapFinalGBuffer fullforwardshadows
	#pragma multi_compile_fog
	#pragma target 3.0
	// needs more than 8 texcoords
	#pragma exclude_renderers gles
	#include "UnityPBSLighting.cginc"

	#pragma multi_compile __ _TERRAIN_NORMAL_MAP

	#define TERRAIN_SURFACE_OUTPUT SurfaceOutputStandard

	sampler2D _Control;
	float4 _Control_ST;
	sampler2D _Splat0, _Splat1, _Splat2, _Splat3;
	half4 _Splat0_ST, _Splat1_ST, _Splat2_ST, _Splat3_ST;
	#ifdef _TERRAIN_NORMAL_MAP
	sampler2D _Normal0, _Normal1, _Normal2, _Normal3;
	#endif

	half _Metallic0;
	half _Metallic1;
	half _Metallic2;
	half _Metallic3;

	half _Smoothness0;
	half _Smoothness1;
	half _Smoothness2;
	half _Smoothness3;

	float _TriplanarBlendSharpness;
	float _TextureScale;

	struct Input
	{
	float2 tc_Control : TEXCOORD4;
	float3 wNormal;
	float3 worldPos;
	UNITY_FOG_COORDS(5)
	};

	void vert(inout appdata_full v, out Input o)
	{
	UNITY_INITIALIZE_OUTPUT(Input, o);
	o.tc_Control = TRANSFORM_TEX(v.texcoord, _Control);
	float4 pos = mul(UNITY_MATRIX_MVP, v.vertex);
	UNITY_TRANSFER_FOG(o, pos);

	o.wNormal =normalize(mul(unity_ObjectToWorld, fixed4(v.normal, 0)).xyz);

	#ifdef _TERRAIN_NORMAL_MAP
	v.tangent.xyz = cross(v.normal, float3(0, 0, 1));
	v.tangent.w = -1;
	#endif
	}

	void surf(Input IN, inout SurfaceOutputStandard o) {
	half4 splat_control;
	half weight;
	fixed4 mixedDiffuse=0;
	half4 defaultSmoothness = half4(_Smoothness0, _Smoothness1, _Smoothness2, _Smoothness3);

	//Custom begin=================================================<<<<<<<<<<<<<<<<<<<<<<<<<<<
	splat_control = tex2D(_Control, IN.tc_Control);
	weight = dot(splat_control, half4(1, 1, 1, 1));
	splat_control /= (weight + 1e-3f);

	//triplanar---------------<<<<<<<<<<<<
	// 计算权重
	float3 N =normalize( IN.wNormal);
	//N -= 0.4f;
	half3 blendWeights = pow(abs(IN.wNormal), _TriplanarBlendSharpness);
	blendWeights /= dot(blendWeights, 1.0);
	half2 xUV = IN.worldPos.zy;// / _TextureScale;
	half2 yUV = IN.worldPos.xz;// / _TextureScale;
	half2 zUV = IN.worldPos.xy;// / _TextureScale;

	// 通常 Triplanar 实现，只是多了三张贴图处理
	fixed4 tex0X = tex2D(_Splat0, (xUV*_Splat0_ST.xy + _Splat0_ST.zw)/ _TextureScale);
	fixed4 tex0Y = tex2D(_Splat0, (yUV*_Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);
	fixed4 tex0Z = tex2D(_Splat0, (zUV*_Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);

	fixed4 tex1X = tex2D(_Splat1, (xUV*_Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 tex1Y = tex2D(_Splat1, (yUV*_Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 tex1Z = tex2D(_Splat1, (zUV*_Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);

	fixed4 tex2X = tex2D(_Splat2, (xUV*_Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 tex2Y = tex2D(_Splat2, (yUV*_Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 tex2Z = tex2D(_Splat2, (zUV*_Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);

	fixed4 tex3X = tex2D(_Splat3, (xUV*_Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 tex3Y = tex2D(_Splat3, (yUV*_Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 tex3Z = tex2D(_Splat3, (zUV*_Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);

	fixed4 tex0 = tex0XblendWeights.x + tex0Y blendWeights.y + tex0Z * blendWeights.z;
	fixed4 tex1 = tex1XblendWeights.x + tex1Y blendWeights.y + tex1Z * blendWeights.z;
	fixed4 tex2 = tex2XblendWeights.x + tex2Y blendWeights.y + tex2Z * blendWeights.z;
	fixed4 tex3 = tex3XblendWeights.x + tex3Y blendWeights.y + tex3Z * blendWeights.z;

	// 融合权重，添加高光
	tex0 = splat_control.r half4(1.0, 1.0, 1.0, defaultSmoothness.r);
	tex1 = splat_control.g half4(1.0, 1.0, 1.0, defaultSmoothness.g);
	tex2 = splat_control.b half4(1.0, 1.0, 1.0, defaultSmoothness.b);
	tex3 = splat_control.a half4(1.0, 1.0, 1.0, defaultSmoothness.a);

	mixedDiffuse = tex0 + tex1 + tex2 + tex3;

	//--------- 法线 ---------<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	#ifdef _TERRAIN_NORMAL_MAP
	fixed4 nrm = 0.0f;

	fixed4 nm0X = tex2D(_Normal0, (xUV* _Splat0_ST.xy + _Splat0_ST.zw)/ _TextureScale);
	fixed4 nm0Y = tex2D(_Normal0, (yUV* _Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);
	fixed4 nm0Z = tex2D(_Normal0, (zUV* _Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);

	fixed4 nm1X = tex2D(_Normal1, (xUV* _Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 nm1Y = tex2D(_Normal1, (yUV* _Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 nm1Z = tex2D(_Normal1, (zUV* _Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);

	fixed4 nm2X = tex2D(_Normal2, (xUV* _Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 nm2Y = tex2D(_Normal2, (yUV* _Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 nm2Z = tex2D(_Normal2, (zUV* _Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);

	fixed4 nm3X = tex2D(_Normal3, (xUV* _Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 nm3Y = tex2D(_Normal3, (yUV* _Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 nm3Z = tex2D(_Normal3, (zUV* _Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);

	fixed4 nm0 = nm0XblendWeights.x +nm0Y blendWeights.y + nm0Z * blendWeights.z;
	fixed4 nm1 = nm1XblendWeights.x + nm1Y blendWeights.y + nm1Z * blendWeights.z;
	fixed4 nm2 = nm2XblendWeights.x + nm2Y blendWeights.y + nm2Z * blendWeights.z;
	fixed4 nm3 = nm3XblendWeights.x + nm3Y blendWeights.y + nm3Z * blendWeights.z;

	nm0 *= splat_control.r;
	nm1 *= splat_control.g;
	nm2 *= splat_control.b;
	nm3 *= splat_control.a;

	nrm = nm0 + nm1 + nm2 + nm3;
	o.Normal = UnpackNormal(nrm);
	#endif
	//End Custom=================================================<<<<<<<<<<<<<<<<<<<<<<<<<<<

	o.Albedo = mixedDiffuse.rgb;//max(fixed3(0.001, 0.001, 0.001), mixedDiffuse.rgb);
	o.Alpha = weight;
	o.Smoothness = mixedDiffuse.a;
	o.Metallic = dot(splat_control, half4(_Metallic0, _Metallic1, _Metallic2, _Metallic3));
	}

	void SplatmapFinalColor(Input IN, TERRAIN_SURFACE_OUTPUT o, inout fixed4 color)
	{
	color *= o.Alpha;
	#ifdef TERRAIN_SPLAT_ADDPASS
	UNITY_APPLY_FOG_COLOR(IN.fogCoord, color, fixed4(0, 0, 0, 0));
	#else
	UNITY_APPLY_FOG(IN.fogCoord, color);
	#endif
	}

	void SplatmapFinalPrepass(Input IN, TERRAIN_SURFACE_OUTPUT o, inout fixed4 normalSpec)
	{
	normalSpec *= o.Alpha;
	}

	void SplatmapFinalGBuffer(Input IN, TERRAIN_SURFACE_OUTPUT o, inout half4 outGBuffer0, inout half4 outGBuffer1, inout half4 outGBuffer2, inout half4 emission)
	{
	UnityStandardDataApplyWeightToGbuffer(outGBuffer0, outGBuffer1, outGBuffer2, o.Alpha);
	emission *= o.Alpha;
	}

	ENDCG
	}

	dependency "AddPassShader" = "Hidden/TerrainEngine/Splatmap/TriplanarTerrain-AddPass"
	dependency "BaseMapShader" = "Hidden/TerrainEngine/Splatmap/TriplanarTerrain-Base"

	Fallback "Nature/Terrain/Diffuse"
	}

解释都在代码最开头，就这样。

# AddPass

	//2016.12.15 by cwhisme
	// 在 FirstPass，即前一份代码基础上，处理超出四张地形贴图

	Shader "Hidden/TerrainEngine/Splatmap/TriplanarTerrain-AddPass"
	{
	Properties{
	// set by terrain engine
	[HideInInspector] _Control("Control (RGBA)", 2D) = "red" {}
	[HideInInspector] _Splat3("Layer 3 (A)", 2D) = "white" {}
	[HideInInspector] _Splat2("Layer 2 (B)", 2D) = "white" {}
	[HideInInspector] _Splat1("Layer 1 (G)", 2D) = "white" {}
	[HideInInspector] _Splat0("Layer 0 (R)", 2D) = "white" {}
	[HideInInspector] _Normal3("Normal 3 (A)", 2D) = "bump" {}
	[HideInInspector] _Normal2("Normal 2 (B)", 2D) = "bump" {}
	[HideInInspector] _Normal1("Normal 1 (G)", 2D) = "bump" {}
	[HideInInspector] _Normal0("Normal 0 (R)", 2D) = "bump" {}
	[HideInInspector][Gamma] _Metallic0("Metallic 0", Range(0.0, 1.0)) = 0.0
	[HideInInspector][Gamma] _Metallic1("Metallic 1", Range(0.0, 1.0)) = 0.0
	[HideInInspector][Gamma] _Metallic2("Metallic 2", Range(0.0, 1.0)) = 0.0
	[HideInInspector][Gamma] _Metallic3("Metallic 3", Range(0.0, 1.0)) = 0.0
	[HideInInspector] _Smoothness0("Smoothness 0", Range(0.0, 1.0)) = 1.0
	[HideInInspector] _Smoothness1("Smoothness 1", Range(0.0, 1.0)) = 1.0
	[HideInInspector] _Smoothness2("Smoothness 2", Range(0.0, 1.0)) = 1.0
	[HideInInspector] _Smoothness3("Smoothness 3", Range(0.0, 1.0)) = 1.0

	}

	SubShader{
	Tags{
	"Queue" = "Geometry-99"
	"IgnoreProjector" = "True"
	"RenderType" = "Opaque"
	}

	CGPROGRAM
	#pragma surface surf Standard decal:add vertex:vert finalcolor:SplatmapFinalColor finalgbuffer:SplatmapFinalGBuffer fullforwardshadows
	#pragma multi_compile_fog
	#pragma target 3.0
	// needs more than 8 texcoords
	#pragma exclude_renderers gles
	#include "UnityPBSLighting.cginc"

	#pragma multi_compile __ _TERRAIN_NORMAL_MAP

	#define TERRAIN_SPLAT_ADDPASS
	#define TERRAIN_SURFACE_OUTPUT SurfaceOutputStandard

	sampler2D _Control;
	float4 _Control_ST;
	sampler2D _Splat0, _Splat1, _Splat2, _Splat3;
	half4 _Splat0_ST, _Splat1_ST, _Splat2_ST, _Splat3_ST;
	#ifdef _TERRAIN_NORMAL_MAP
	sampler2D _Normal0, _Normal1, _Normal2, _Normal3;
	#endif

	half _Metallic0;
	half _Metallic1;
	half _Metallic2;
	half _Metallic3;

	half _Smoothness0;
	half _Smoothness1;
	half _Smoothness2;
	half _Smoothness3;

	float _TriplanarBlendSharpness;
	float _TextureScale;

	struct Input
	{
	float2 tc_Control : TEXCOORD4;
	float3 wNormal;
	float3 worldPos;
	UNITY_FOG_COORDS(5)
	};

	void vert(inout appdata_full v, out Input o)
	{
	UNITY_INITIALIZE_OUTPUT(Input, o);
	o.tc_Control = TRANSFORM_TEX(v.texcoord, _Control);
	float4 pos = mul(UNITY_MATRIX_MVP, v.vertex);
	UNITY_TRANSFER_FOG(o, pos);

	o.wNormal =normalize(mul(unity_ObjectToWorld, fixed4(v.normal, 0)).xyz);

	#ifdef _TERRAIN_NORMAL_MAP
	v.tangent.xyz = cross(v.normal, float3(0, 0, 1));
	v.tangent.w = -1;
	#endif
	}

	void surf(Input IN, inout SurfaceOutputStandard o) {
	half4 splat_control;
	half weight;
	fixed4 mixedDiffuse=0;
	half4 defaultSmoothness = half4(_Smoothness0, _Smoothness1, _Smoothness2, _Smoothness3);

	//Custom begin=================================================<<<<<<<<<<<<<<<<<<<<<<<<<<<
	splat_control = tex2D(_Control, IN.tc_Control);
	weight = dot(splat_control, half4(1, 1, 1, 1));

	#if !defined(SHADER_API_MOBILE) && defined(TERRAIN_SPLAT_ADDPASS)
	clip(weight == 0.0f ? -1 : 1);
	#endif

	splat_control /= (weight + 1e-3f);

	//triplanar---------------<<<<<<<<<<<<
	// 计算权重
	float3 N =normalize( IN.wNormal);
	//N -= 0.4f;
	half3 blendWeights = pow(abs(IN.wNormal), _TriplanarBlendSharpness);
	blendWeights /= dot(blendWeights, 1.0);
	half2 xUV = IN.worldPos.zy;// / _TextureScale;
	half2 yUV = IN.worldPos.xz;// / _TextureScale;
	half2 zUV = IN.worldPos.xy;// / _TextureScale;

	// 通常 Triplanar 实现，只是多了三张贴图处理
	fixed4 tex0X = tex2D(_Splat0, (xUV*_Splat0_ST.xy + _Splat0_ST.zw)/ _TextureScale);
	fixed4 tex0Y = tex2D(_Splat0, (yUV*_Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);
	fixed4 tex0Z = tex2D(_Splat0, (zUV*_Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);

	fixed4 tex1X = tex2D(_Splat1, (xUV*_Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 tex1Y = tex2D(_Splat1, (yUV*_Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 tex1Z = tex2D(_Splat1, (zUV*_Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);

	fixed4 tex2X = tex2D(_Splat2, (xUV*_Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 tex2Y = tex2D(_Splat2, (yUV*_Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 tex2Z = tex2D(_Splat2, (zUV*_Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);

	fixed4 tex3X = tex2D(_Splat3, (xUV*_Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 tex3Y = tex2D(_Splat3, (yUV*_Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 tex3Z = tex2D(_Splat3, (zUV*_Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);

	fixed4 tex0 = tex0XblendWeights.x + tex0Y blendWeights.y + tex0Z * blendWeights.z;
	fixed4 tex1 = tex1XblendWeights.x + tex1Y blendWeights.y + tex1Z * blendWeights.z;
	fixed4 tex2 = tex2XblendWeights.x + tex2Y blendWeights.y + tex2Z * blendWeights.z;
	fixed4 tex3 = tex3XblendWeights.x + tex3Y blendWeights.y + tex3Z * blendWeights.z;

	// 融合权重，添加高光
	tex0 = splat_control.r half4(1.0, 1.0, 1.0, defaultSmoothness.r);
	tex1 = splat_control.g half4(1.0, 1.0, 1.0, defaultSmoothness.g);
	tex2 = splat_control.b half4(1.0, 1.0, 1.0, defaultSmoothness.b);
	tex3 = splat_control.a half4(1.0, 1.0, 1.0, defaultSmoothness.a);

	mixedDiffuse = tex0 + tex1 + tex2 + tex3;

	//--------- 法线 ---------<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	#ifdef _TERRAIN_NORMAL_MAP
	fixed4 nrm = 0.0f;

	fixed4 nm0X = tex2D(_Normal0, (xUV* _Splat0_ST.xy + _Splat0_ST.zw)/ _TextureScale);
	fixed4 nm0Y = tex2D(_Normal0, (yUV* _Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);
	fixed4 nm0Z = tex2D(_Normal0, (zUV* _Splat0_ST.xy + _Splat0_ST.zw) / _TextureScale);

	fixed4 nm1X = tex2D(_Normal1, (xUV* _Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 nm1Y = tex2D(_Normal1, (yUV* _Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);
	fixed4 nm1Z = tex2D(_Normal1, (zUV* _Splat1_ST.xy + _Splat1_ST.zw) / _TextureScale);

	fixed4 nm2X = tex2D(_Normal2, (xUV* _Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 nm2Y = tex2D(_Normal2, (yUV* _Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);
	fixed4 nm2Z = tex2D(_Normal2, (zUV* _Splat2_ST.xy + _Splat2_ST.zw)/ _TextureScale);

	fixed4 nm3X = tex2D(_Normal3, (xUV* _Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 nm3Y = tex2D(_Normal3, (yUV* _Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);
	fixed4 nm3Z = tex2D(_Normal3, (zUV* _Splat3_ST.xy + _Splat3_ST.zw)/ _TextureScale);

	fixed4 nm0 = nm0XblendWeights.x +nm0Y blendWeights.y + nm0Z * blendWeights.z;
	fixed4 nm1 = nm1XblendWeights.x + nm1Y blendWeights.y + nm1Z * blendWeights.z;
	fixed4 nm2 = nm2XblendWeights.x + nm2Y blendWeights.y + nm2Z * blendWeights.z;
	fixed4 nm3 = nm3XblendWeights.x + nm3Y blendWeights.y + nm3Z * blendWeights.z;

	nm0 *= splat_control.r;
	nm1 *= splat_control.g;
	nm2 *= splat_control.b;
	nm3 *= splat_control.a;

	nrm = nm0 + nm1 + nm2 + nm3;
	o.Normal = UnpackNormal(nrm);
	#endif
	//End Custom=================================================<<<<<<<<<<<<<<<<<<<<<<<<<<<

	o.Albedo = mixedDiffuse.rgb;//max(fixed3(0.001, 0.001, 0.001), mixedDiffuse.rgb);
	o.Alpha = weight;
	o.Smoothness = mixedDiffuse.a;
	o.Metallic = dot(splat_control, half4(_Metallic0, _Metallic1, _Metallic2, _Metallic3));
	}

	void SplatmapFinalColor(Input IN, TERRAIN_SURFACE_OUTPUT o, inout fixed4 color)
	{
	color *= o.Alpha;
	#ifdef TERRAIN_SPLAT_ADDPASS
	UNITY_APPLY_FOG_COLOR(IN.fogCoord, color, fixed4(0, 0, 0, 0));
	#else
	UNITY_APPLY_FOG(IN.fogCoord, color);
	#endif
	}

	void SplatmapFinalPrepass(Input IN, TERRAIN_SURFACE_OUTPUT o, inout fixed4 normalSpec)
	{
	normalSpec *= o.Alpha;
	}

	void SplatmapFinalGBuffer(Input IN, TERRAIN_SURFACE_OUTPUT o, inout half4 outGBuffer0, inout half4 outGBuffer1, inout half4 outGBuffer2, inout half4 emission)
	{
	UnityStandardDataApplyWeightToGbuffer(outGBuffer0, outGBuffer1, outGBuffer2, o.Alpha);
	emission *= o.Alpha;
	}

	ENDCG
	}

	Fallback "Hidden/TerrainEngine/Splatmap/Diffuse-AddPass"
	}