fix weather interpolation & add 'fall.max_intensity' property

src/graphics/render/Decorator.cpp

@@ -115,7 +115,8 @@ void Decorator::updateRandom(
             return;
         }
     }
-    if (dst2 < 128 && random.randFloat() < glm::pow(weather.intensity, 2.0f) && rainSplash.has_value()) {
+    float intensity = weather.intensity * weather.fall.maxIntensity;
+    if (dst2 < 128 && random.randFloat() < glm::pow(intensity, 2.0f) && rainSplash.has_value()) {
         auto treg = util::get_texture_region(
             assets, "particles:rain_splash_0", ""
         );
@@ -137,7 +138,7 @@ void Decorator::updateRandom(
             sound,
             pos,
             false,
-            weather.intensity * weather.intensity,
+            intensity * intensity,
             1.0f,
             false,
             audio::PRIORITY_LOW,

src/graphics/render/WorldRenderer.cpp

@@ -203,9 +203,10 @@ void WorldRenderer::renderLevel(
 
     std::array<const WeatherPreset*, 2> weatherInstances {&weather.a, &weather.b};
     for (const auto& weather : weatherInstances) {
+        float maxIntensity = weather->fall.maxIntensity;
         float zero = weather->fall.minOpacity;
         float one = weather->fall.maxOpacity;
-        float t = (weather->intensity * (one - zero)) + zero;
+        float t = (weather->intensity * (one - zero)) * maxIntensity + zero;
         entityShader.uniform1i("u_alphaClip", weather->fall.opaque);
         entityShader.uniform1f("u_opacity", weather->fall.opaque ? t * t : t);
         if (weather->intensity > 1.e-3f && !weather->fall.texture.empty()) {
@@ -342,8 +343,10 @@ void WorldRenderer::draw(
 
     const auto& settings = engine.getSettings();
     const auto& worldInfo = world->getInfo();
-    float clouds = weather.b.clouds * glm::sqrt(weather.t) +
-                   weather.a.clouds * glm::sqrt(1.0f - weather.t);
+    
+    float sqrtT = glm::sqrt(weather.t);
+    float clouds = weather.b.clouds * sqrtT +
+                   weather.a.clouds * (1.0f - sqrtT);
     clouds = glm::max(worldInfo.fog, clouds);
     float mie = 1.0f + glm::max(worldInfo.fog, clouds * 0.5f) * 2.0f;