add weather and time

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

@@ -0,0 +1,66 @@
+
+struct EnviroRemovalZones
+{
+    float type; 
+    float3 pos; 
+    float radius;
+    float3 size; 
+    float3 axis; 
+    float stretch;
+    float density;
+    float feather;
+    float4x4 transform;
+    float pad0;
+    float pad1;
+};
+ 
+
+StructuredBuffer<EnviroRemovalZones> _EnviroRemovalZones : register(t1);
+float _EnviroRemovalZonesCount;
+
+float3 InverseLerp(float lowThreshold, float hiThreshold, float3 value)
+{
+	return (value - lowThreshold) / (hiThreshold - lowThreshold);
+}
+float ClampedInverseLerp(float lowThreshold, float hiThreshold, float value)
+{
+	return saturate(InverseLerp(lowThreshold, hiThreshold, value));
+} 
+
+
+void ParticleZones(float3 pos, inout float density)
+{
+    for (int i = 0; i < _EnviroRemovalZonesCount; i++)
+    {
+        if(_EnviroRemovalZones[i].type == 0) 
+        { 
+            float3 dir = _EnviroRemovalZones[i].pos - pos;
+            float3 axis = _EnviroRemovalZones[i].axis;
+            float3 dirAlongAxis = dot(dir, axis) * axis;
+
+            dir = dir + dirAlongAxis * _EnviroRemovalZones[i].stretch;
+            float distsq = dot(dir, dir);
+ 
+            float feather = 1.0;
+            feather = (1.0 - smoothstep (_EnviroRemovalZones[i].radius * feather, _EnviroRemovalZones[i].radius, distsq));
+
+            float contribution = feather * _EnviroRemovalZones[i].density;
+            density = clamp(density + contribution,0,1);
+        }
+        else 
+        {
+            float influence = 1;
+            float3 position = mul(_EnviroRemovalZones[i].transform, float4(pos, 1)).xyz;
+ 
+            float x = ClampedInverseLerp(-0.5f, -0.5f + _EnviroRemovalZones[i].feather, position.x) - ClampedInverseLerp(0.5f - _EnviroRemovalZones[i].feather, 0.5f, position.x);
+		    float y = ClampedInverseLerp(-0.5f, -0.5f + _EnviroRemovalZones[i].feather, position.y) - ClampedInverseLerp(0.5f - _EnviroRemovalZones[i].feather, 0.5f, position.y);
+		    float z = ClampedInverseLerp(-0.5f, -0.5f + _EnviroRemovalZones[i].feather, position.z) - ClampedInverseLerp(0.5f - _EnviroRemovalZones[i].feather, 0.5f, position.z);
+		    
+            influence = x * y * z; 
+
+            density += _EnviroRemovalZones[i].density * influence;
+            density = clamp(density,0,1);
+        }
+    }
+}
+