fix:代码提交

Assets/URPWater/Shaders/HLSL/Includes/URPWaterScattering.hlsl

@@ -0,0 +1,90 @@
+//-----------------------------------------------------------------------------
+// Copyright(C) Yan Verde - All Rights Reserved
+// Copyright protected under Unity Asset Store EULA
+// Refer to https://unity3d.com/legal/as_terms for more informations
+// -----------------------------------------------------------------------------
+// URP Water
+// Author : Yan Verde
+// Date : April 10, 2021
+// -----------------------------------------------------------------------------
+
+
+#ifndef URPWATER_SCATTERING_INCLUDED
+#define URPWATER_SCATTERING_INCLUDED
+
+#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+#include "URPWaterVariables.hlsl"
+#include "URPWaterHelpers.hlsl"
+
+
+void ComputeScattering(inout GlobalData data, Varyings IN)
+{	
+	#if _SCATTERING_ON
+
+		Light mainLight = data.mainLight;
+		half3 lightColor = mainLight.color;
+
+		// ==================================
+		// Scattering
+		// ==================================
+		half3 L = mainLight.direction;
+		half3 V = data.worldViewDir;
+		half3 N = lerp(half3(0,1,0), data.worldNormal, _CapsScatterNormals * 0.1);
+
+		#if _DOUBLE_SIDED_ON
+		L.y = lerp(-L.y, L.y, data.vFace);
+		#endif
+
+
+		half3 H = normalize(L + N);
+		half VdotH = max(0, dot(V, -H));
+		VdotH = smoothstep(_ScatteringRangeMin, _ScatteringRangeMax, VdotH);
+
+		half scatterMask = saturate(VdotH * _ScatteringIntensity);
+
+		// ===================================
+		// Caps Scattering
+		// ===================================
+
+		#if _DISPLACEMENTMODE_GERSTNER || _DISPLACEMENTMODE_GERSTNERPLUS
+		#if _CAPS_SCATTERING_ON
+
+		half capsMask = smoothstep(_CapsScatteringRangeMin, _CapsScatteringRangeMax, saturate(IN.texcoord3.y));
+
+
+		half3 capsNormals = lerp(half3(0, 1, 0), data.worldNormal, _CapsScatterNormals);
+		//half NdotL = saturate(dot(IN.normal.xyz, -L) * 0.5 + 0.5);
+		half NdotV = saturate(dot(IN.normal.xyz, V));
+		half NdotV2 = saturate(dot(capsNormals, V));
+
+		half fresnel = max(0, pow(NdotV,4) * NdotV2 );
+		half topDownMask =  saturate(dot(float3(0, 1, 0), -GetViewForwardDir()));
+
+		fresnel *= 1 - smoothstep(0.5, 1, topDownMask);
+		half finalCapsMask = saturate(fresnel) * capsMask * _CapsScatteringIntensity;
+
+		scatterMask += finalCapsMask;
+
+
+		//data.debug.rgb = scatterMask;
+		#endif
+		#endif
+
+		// ==================================
+		// Output
+		// ==================================
+
+		//data.debug.rgb = scatterMask;
+
+		half3 scatterColor = _ScatteringColor.rgb * saturate(scatterMask);
+		data.scattering = scatterColor * saturate(lightColor);
+
+		#if _DOUBLE_SIDED_ON
+		data.scattering = lerp(data.scattering * 0.25, data.scattering, data.vFace);
+		#endif
+
+
+	#endif
+}
+
+#endif