Make seasonal snow only in winter - early spring, make rain less when not under a cloud

shaders/lib/climate_settings.glsl

@@ -29,7 +29,8 @@
 
 	    void YearCycleColor (
 	        inout vec3 FinalColor,
-	        vec3 glcolor
+	        vec3 glcolor,
+			inout float SnowySeason
 	    ){
 	    	// colors for things that arent leaves and using the tint index.
 	    	vec3 SummerCol = vec3(Summer_R, Summer_G, Summer_B);
@@ -79,6 +80,15 @@
 
 	    	// multiply final color by the final lerped color, because it contains all the other colors.
 	    	if(IsTintIndex) FinalColor = SpringToSummer;
+
+			#ifdef Snowy_Winter
+				// this is to make snow only exist in winter
+	    		float FallToWinter_snowfall = mix(0.0, 1.0, AutumnTime);
+	    		float WinterToSpring_snowfall = mix(FallToWinter_snowfall, 0.0, WinterTime);
+				SnowySeason = WinterToSpring_snowfall;
+			#else
+				SnowySeason = 0.0;
+			#endif
 	    }
 	#endif
 #endif

shaders/lib/settings.glsl

@@ -216,7 +216,8 @@
 
 #define Seasons
 #define Season_Length 24 // how long each season lasts in minecraft days. 91 is roughly how long each season is in reality. 1 will make a year last 4 days [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91]
-// #define Snowy_Winter // snow in the winter, yes or no?
+#define Snowy_Winter // snow in the winter, yes or no?
+
 #define Summer_R 1.0 // the color of the plants during this season [0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0]
 #define Summer_G 1.0 // the color of the plants during this season [0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0]
 #define Summer_B 1.0 // the color of the plants during this season [0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0]

shaders/lib/volumetricClouds.glsl

@@ -391,5 +391,24 @@ float GetCloudShadow_VLFOG(vec3 WorldPos){
 	// do not allow it to exist above the lowest cloud plane
 	// shadow *= clamp(((MaxCumulusHeight + CumulusHeight)*0.435 - WorldPos.y)/100,0.0,1.0) ;
 
+	return shadow;
+}
+
+float GetCloudSkyOcclusion(vec3 WorldPos){
+
+	float shadow = 0.0;
+
+	vec3 shadowDir = vec3(0,1,0);
+
+
+	// assume a flat layer of cloud, and stretch the sampled density along the sunvector, starting from some vertical layer in the cloud.
+	#ifdef Cumulus
+		vec3 lowShadowStart = WorldPos + shadowDir/abs(shadowDir.y) * max((MaxCumulusHeight - 60) - WorldPos.y,0.0) ;
+		shadow += GetCumulusDensity(lowShadowStart,0)*Cumulus_density;
+	#endif
+
+
+	shadow = clamp(exp(-shadow*25.0) ,0.0,1.0);
+
 	return shadow;
 }