fix sky shader

res/shaders/lib/shadows.glsl

@@ -43,7 +43,7 @@ float calc_shadow(
 // TODO: add array textures support
 float calc_shadow(vec4 modelPos, vec3 realnormal, float distance) {
 #ifdef ENABLE_SHADOWS
-    float s = pow(abs(cos(u_dayTime * PI2)), 0.25) * u_shadowsOpacity;
+    float s = u_shadowsOpacity;
     vec3 normalOffset = realnormal * (distance > 64.0 ? 0.2 : 0.04);
 
     // as slow as mix(...) 

res/shaders/lib/sky.glsl

@@ -4,7 +4,7 @@
 #include <constants>
 
 vec3 pick_sky_color(samplerCube cubemap) {
-    vec3 skyLightColor = texture(cubemap, vec3(0.8f, 0.01f, 0.4f)).rgb;
+    vec3 skyLightColor = texture(cubemap, vec3(0.4f, 0.05f, 0.4f)).rgb;
     skyLightColor *= SKY_LIGHT_TINT;
     skyLightColor = min(vec3(1.0f), skyLightColor * SKY_LIGHT_MUL);
     skyLightColor = max(MIN_SKY_LIGHT, skyLightColor);

res/shaders/skybox_gen.glslf

@@ -268,7 +268,11 @@ void main() {
         camera_vector, 					// the camera vector (ray direction of this pixel)
         1e12f, 						    // max dist, essentially the scene depth
         vec3(0.0f),						// scene color, the color of the current pixel being rendered
-        vec3(u_lightDir.x, pow(u_lightDir.y, 3.0), u_lightDir.z),	// light direction
+        vec3(
+            u_lightDir.x, 
+            u_lightDir.y,
+            u_lightDir.z
+        ),	// light direction
         vec3(40.0*fog),						// light intensity, 40 looks nice
         PLANET_POS,						// position of the planet
         PLANET_RADIUS,                  // radius of the planet in meters

src/graphics/core/Shadows.cpp

@@ -96,12 +96,16 @@ void Shadows::setup(Shader& shader, const Weather& weather) {
     if (shadows) {
         const auto& worldInfo = level.getWorld()->getInfo();
         float cloudsIntensity = glm::max(worldInfo.fog, weather.clouds());
+        float shadowsOpacity = 1.0f - cloudsIntensity;
+        shadowsOpacity *= glm::sqrt(glm::abs(
+            glm::mod((worldInfo.daytime + 0.5f) * 2.0f, 1.0f) * 2.0f - 1.0f
+        ));
         shader.uniform1i("u_screen", 0);
         shader.uniformMatrix("u_shadowsMatrix[0]", shadowCamera.getProjView());
         shader.uniformMatrix("u_shadowsMatrix[1]", wideShadowCamera.getProjView());
         shader.uniform3f("u_sunDir", shadowCamera.front);
         shader.uniform1i("u_shadowsRes", shadowMap->getResolution());
-        shader.uniform1f("u_shadowsOpacity", 1.0f - cloudsIntensity); // TODO: make it configurable
+        shader.uniform1f("u_shadowsOpacity", shadowsOpacity); // TODO: make it configurable
         shader.uniform1f("u_shadowsSoftness", 1.0f + cloudsIntensity * 4); // TODO: make it configurable
 
         glActiveTexture(GL_TEXTURE0 + TARGET_SHADOWS0);