some fog fixes

Author: michaljaz

src/scripts/rendering/DistanceBasedFog.js

@@ -10,7 +10,7 @@ class DistanceBasedFog {
   }
 
   updateDistance (val) {
-    this.farnear.x = (val - 2) * 16
+    this.farnear.x = (Math.sqrt(val)) * 16
     this.farnear.y = (val - 1) * 16
   }