add weather and time

Assets/Enviro 3 - Sky and Weather/Resources/Shader/Includes/VolumetricCloudsBlendInclude.cginc

@@ -0,0 +1,85 @@
+#pragma multi_compile __ ENVIRO_SIMPLESKY
+
+#if defined(UNITY_STEREO_INSTANCING_ENABLED) || defined(UNITY_STEREO_MULTIVIEW_ENABLED)
+UNITY_DECLARE_TEX2DARRAY(_EnviroClouds);
+#else
+sampler2D _EnviroClouds;  
+#endif
+
+float3 _AmbientColor;
+float3 _DirectLightColor;
+float _AtmosphereColorSaturateDistance;
+float4 _CloudsParameter;
+float _SolarTime;
+//float _AmbientDistanceScale;
+
+float ComputeAmbient(float4 cloudsColor, float normalizedHeight)
+{
+    float _AmbientDistanceScale = 0.25;
+    // Height influence: higher clouds receive more ambient sky light
+    // 0.7 base → 1.3 peak (keep within a modest range for realism)
+    float heightFactor = lerp(0.7, 1.3, normalizedHeight);
+
+    // Distance influence: nearby clouds look brighter, far clouds fade
+    // _AmbientDistanceScale lets you control falloff distance
+    float distFalloff = exp(-cloudsColor.g * _AmbientDistanceScale);
+
+    // Combine
+    float ambient = cloudsColor.a * heightFactor * distFalloff;
+    return saturate(ambient);
+}
+ 
+
+float4 GetCloudColor(float4 cloudsColor, float3 worldPos)
+{
+    float3 viewDir = normalize(worldPos.xyz - _WorldSpaceCameraPos.xyz);
+    
+    float3 sunColor = pow(_DirectLightColor.rgb,2) * 2;
+    float3 skyColor = float3(1,1,1);
+     
+    #if ENVIRO_SIMPLESKY
+        skyColor = GetSkyColorSimple(viewDir, 0.005f);  
+    #else
+        skyColor = GetSkyColor(viewDir, 0.005f);  
+    #endif
+
+    float3 cloudsPos = _WorldSpaceCameraPos + viewDir * cloudsColor.g;
+    float normalizedHeight = saturate((cloudsPos.y - _CloudsParameter.x) / (_CloudsParameter.y - _CloudsParameter.x));  
+    float ambient = ComputeAmbient(cloudsColor.a, normalizedHeight);   
+    float4 finalColor = float4(cloudsColor.r * sunColor + _AmbientColor * ambient, cloudsColor.a);
+ 
+    float p = smoothstep(0.55, 0.60, _SolarTime); 
+    float dayNightModifier = lerp(1.5, 0.1, p);
+
+    float baseDist = _AtmosphereColorSaturateDistance;
+
+    float kShadowRatio  = dayNightModifier;
+    static const float kMidRatio       = 1.0;
+    static const float kHighlightRatio = 2.0;
+
+    float3 brightness = saturate(finalColor.rgb);
+    float  luminance  = dot(brightness, float3(0.299,0.587,0.114));
+
+    // Blend distance mapping with dynamic base
+    float distLow  = lerp(baseDist * kShadowRatio, baseDist * kMidRatio,saturate(luminance * 2.0));
+    float blendDist = lerp(distLow, baseDist * kHighlightRatio,saturate((luminance - 0.5) * 2.0));
+    // Final factor
+   // float atmosphericBlendFactor = saturate(exp(-cloudsColor.g / _AtmosphereColorSaturateDistance));
+    float atmosphericBlendFactor = saturate(exp(-cloudsColor.g / blendDist));
+    finalColor.rgb = lerp(skyColor, finalColor.rgb, atmosphericBlendFactor);
+        
+    return finalColor;
+}
+
+
+
+float3 ApplyClouds(float3 sceneColor, float2 uv, float3 worldPos)
+{   
+    float4 cloudsColor = UNITY_SAMPLE_SCREENSPACE_TEXTURE(_EnviroClouds, uv);
+    float4 finalColor = GetCloudColor(cloudsColor,worldPos);
+    //return sceneColor.rgb * saturate(1 - finalColor.a) + finalColor.rgb * finalColor.a;
+
+    float a  = saturate(finalColor.a);
+    float3 c = lerp(sceneColor.rgb, finalColor.rgb, a);
+    return sceneColor.rgb * (1 - a) + c * a;
+}