Tweak some parameters of water and clouds to look better

src/shaders/glsl/natural-mystic-cloud.h

@@ -5,7 +5,7 @@
 #include "natural-mystic-noise.h"
 
 /* Generate a pattern of clouds based on a world position. */
-highp float cloudMap(int octaves, highp float time, highp vec3 pos) {
+highp float cloudMap(int octaves, float lowerBound, float upperBound, highp float time, highp vec3 pos) {
     /* Use of highp is essential here, as the uniform TIME in mediump
      * starts to lose precision within 10 minutes.
      */
@@ -20,8 +20,6 @@ highp float cloudMap(int octaves, highp float time, highp vec3 pos) {
     /* We intentionally throw away some
      * of the precision so we get somewhat sparse noise.
      */
-    const float lowerBound = 0.5;
-    const float upperBound = 0.85;
     return fBM(octaves, lowerBound, upperBound, st * 3.0);
 }
 

src/shaders/glsl/natural-mystic-water.h

@@ -181,7 +181,7 @@ vec4 waterSpecularLight(
     highp float incident     = max(0.0, dot(viewDir, halfDir)); // Cosine of the angle.
     highp float reflAngle    = max(0.0, dot(halfDir, normal));
     highp float reflCoeff    = fresnel + (1.0 - fresnel) * pow(1.0 - incident, 5.0);
-    highp vec3  specular     = incomingLight * 160.0 * pow(reflAngle, shininess) * reflCoeff;
+    highp vec3  specular     = incomingLight * 180.0 * pow(reflAngle, shininess) * reflCoeff;
 
     /* Compute the opacity of water. In real life when a light ray
      * hits a surface of water, some part of it will reflect away, and

src/shaders/glsl/sky.fragment

@@ -26,7 +26,7 @@ void main() {
      * as we cannot precompute noises in a texture and instead we have
      * to generate them on the fly. See also
      * http://www.iquilezles.org/www/articles/dynclouds/dynclouds.htm */
-    highp float density = cloudMap(octaves, TIME, worldPos);
+    highp float density = cloudMap(octaves, 0.5, 0.85, TIME, worldPos);
     vec4 shadedCloud = mix(vec4(cloudColor.rgb, 0.0), cloudColor, density);
 
 #  if defined(ENABLE_CLOUD_SHADE)
@@ -46,7 +46,7 @@ void main() {
         float       inside   = 0.0;
         for (int i = 0; i < numSteps; i++) {
             rayPos += rayStep;
-            highp float height = cloudMap(octaves / 2, TIME, rayPos);
+            highp float height = cloudMap(octaves / 2, 0.4, 1.0, TIME, rayPos);
             inside += max(0.0, height - (rayPos.y - worldPos.y));
         }
         /* Average of height differences. This isn't a distance of ray