Added clarification for shader settings

README.md

@@ -67,6 +67,9 @@ To implement this sky into a project
 7. It may be necessary to reload the scene to make the sky work in the editor
 8. If the sky is very slow try changing the process mode to "High-Quality Incremental" in the Sky settings in the WorldEnvironment
 
+To understand what the shader settings do, read the comments in the `nishita_sky.gdshader` file.
+The variables prefixed with `precomputed_` are set by the `NishitaSky.gd` script, they cannot be modified.
+
 ## Todo
 * Fix clouds "jumping" after some time
 * Clean up code

nishita_sky.gdshader

@@ -15,16 +15,16 @@ uniform float precomputed_sun_size
 uniform float precomputed_sun_energy = 1.0;
 uniform float precomputed_background_intensity = 1.0;
 
-// Controls the scattering responsible for the blue color of a real life sky
+// Rayleigh scattering gives the sky its blue color, its effects are visible across the whole sky
 uniform vec3 rayleigh_color = vec3(0.258928571428571, 0.580357142857143, 1.0);
 uniform float rayleigh
 	: hint_range(0, 64) =
 		  1.0; // higher values absorb more rayleigh_color, more blue by default
 
-// Controls the scattering responsible for the white horizon of a real life sky
+// Mie scattering creates a haze, which is visible around the sun and the horizon
 uniform vec3 mie_color = vec3(1.0, 1.0, 1.0);
 uniform float mie
-	: hint_range(0, 64) = 1.0; // higher values make a "foggy" atmosphere
+	: hint_range(0, 64) = 1.0; // increase for a "foggy" atmosphere
 uniform float mie_eccentricity : hint_range(-1, 0.99999) = 0.76;
 
 // Sample counts for different parts of the sky