modified maps

modified maps

Assets/NatureStarterKit2/Standard Assets/Effects/ImageEffects/Shaders/GlobalFog.shader

@@ -0,0 +1,188 @@
+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+Shader "Hidden/GlobalFog" {
+Properties {
+	_MainTex ("Base (RGB)", 2D) = "black" {}
+}
+
+CGINCLUDE
+
+	#include "UnityCG.cginc"
+
+	uniform sampler2D _MainTex;
+	uniform sampler2D_float _CameraDepthTexture;
+	
+	// x = fog height
+	// y = FdotC (CameraY-FogHeight)
+	// z = k (FdotC > 0.0)
+	// w = a/2
+	uniform float4 _HeightParams;
+	
+	// x = start distance
+	uniform float4 _DistanceParams;
+	
+	int4 _SceneFogMode; // x = fog mode, y = use radial flag
+	float4 _SceneFogParams;
+	#ifndef UNITY_APPLY_FOG
+	half4 unity_FogColor;
+	half4 unity_FogDensity;
+	#endif	
+
+	uniform float4 _MainTex_TexelSize;
+	
+	// for fast world space reconstruction
+	uniform float4x4 _FrustumCornersWS;
+	uniform float4 _CameraWS;
+
+	struct v2f {
+		float4 pos : SV_POSITION;
+		float2 uv : TEXCOORD0;
+		float2 uv_depth : TEXCOORD1;
+		float4 interpolatedRay : TEXCOORD2;
+	};
+	
+	v2f vert (appdata_img v)
+	{
+		v2f o;
+		half index = v.vertex.z;
+		v.vertex.z = 0.1;
+		o.pos = UnityObjectToClipPos(v.vertex);
+		o.uv = v.texcoord.xy;
+		o.uv_depth = v.texcoord.xy;
+		
+		#if UNITY_UV_STARTS_AT_TOP
+		if (_MainTex_TexelSize.y < 0)
+			o.uv.y = 1-o.uv.y;
+		#endif				
+		
+		o.interpolatedRay = _FrustumCornersWS[(int)index];
+		o.interpolatedRay.w = index;
+		
+		return o;
+	}
+	
+	// Applies one of standard fog formulas, given fog coordinate (i.e. distance)
+	half ComputeFogFactor (float coord)
+	{
+		float fogFac = 0.0;
+		if (_SceneFogMode.x == 1) // linear
+		{
+			// factor = (end-z)/(end-start) = z * (-1/(end-start)) + (end/(end-start))
+			fogFac = coord * _SceneFogParams.z + _SceneFogParams.w;
+		}
+		if (_SceneFogMode.x == 2) // exp
+		{
+			// factor = exp(-density*z)
+			fogFac = _SceneFogParams.y * coord; fogFac = exp2(-fogFac);
+		}
+		if (_SceneFogMode.x == 3) // exp2
+		{
+			// factor = exp(-(density*z)^2)
+			fogFac = _SceneFogParams.x * coord; fogFac = exp2(-fogFac*fogFac);
+		}
+		return saturate(fogFac);
+	}
+
+	// Distance-based fog
+	float ComputeDistance (float3 camDir, float zdepth)
+	{
+		float dist; 
+		if (_SceneFogMode.y == 1)
+			dist = length(camDir);
+		else
+			dist = zdepth * _ProjectionParams.z;
+		// Built-in fog starts at near plane, so match that by
+		// subtracting the near value. Not a perfect approximation
+		// if near plane is very large, but good enough.
+		dist -= _ProjectionParams.y;
+		return dist;
+	}
+
+	// Linear half-space fog, from https://www.terathon.com/lengyel/Lengyel-UnifiedFog.pdf
+	float ComputeHalfSpace (float3 wsDir)
+	{
+		float3 wpos = _CameraWS + wsDir;
+		float FH = _HeightParams.x;
+		float3 C = _CameraWS;
+		float3 V = wsDir;
+		float3 P = wpos;
+		float3 aV = _HeightParams.w * V;
+		float FdotC = _HeightParams.y;
+		float k = _HeightParams.z;
+		float FdotP = P.y-FH;
+		float FdotV = wsDir.y;
+		float c1 = k * (FdotP + FdotC);
+		float c2 = (1-2*k) * FdotP;
+		float g = min(c2, 0.0);
+		g = -length(aV) * (c1 - g * g / abs(FdotV+1.0e-5f));
+		return g;
+	}
+
+	half4 ComputeFog (v2f i, bool distance, bool height) : SV_Target
+	{
+		half4 sceneColor = tex2D(_MainTex, i.uv);
+		
+		// Reconstruct world space position & direction
+		// towards this screen pixel.
+		float rawDepth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture,i.uv_depth);
+		float dpth = Linear01Depth(rawDepth);
+		float4 wsDir = dpth * i.interpolatedRay;
+		float4 wsPos = _CameraWS + wsDir;
+
+		// Compute fog distance
+		float g = _DistanceParams.x;
+		if (distance)
+			g += ComputeDistance (wsDir, dpth);
+		if (height)
+			g += ComputeHalfSpace (wsDir);
+
+		// Compute fog amount
+		half fogFac = ComputeFogFactor (max(0.0,g));
+		// Do not fog skybox
+		if (rawDepth == _DistanceParams.y)
+			fogFac = 1.0;
+		//return fogFac; // for debugging
+		
+		// Lerp between fog color & original scene color
+		// by fog amount
+		return lerp (unity_FogColor, sceneColor, fogFac);
+	}
+
+ENDCG
+
+SubShader
+{
+	ZTest Always Cull Off ZWrite Off Fog { Mode Off }
+
+	// 0: distance + height
+	Pass
+	{
+		CGPROGRAM
+		#pragma vertex vert
+		#pragma fragment frag
+		half4 frag (v2f i) : SV_Target { return ComputeFog (i, true, true); }
+		ENDCG
+	}
+	// 1: distance
+	Pass
+	{
+		CGPROGRAM
+		#pragma vertex vert
+		#pragma fragment frag
+		half4 frag (v2f i) : SV_Target { return ComputeFog (i, true, false); }
+		ENDCG
+	}
+	// 2: height
+	Pass
+	{
+		CGPROGRAM
+		#pragma vertex vert
+		#pragma fragment frag
+		half4 frag (v2f i) : SV_Target { return ComputeFog (i, false, true); }
+		ENDCG
+	}
+}
+
+Fallback off
+
+}