test: reduce cloud horizon softness

config.js

@@ -353,7 +353,7 @@ window.CONFIG = {
         // cloud-deck ring without changing the actual cloud top/bottom.
         softEdges: true,
         edgeSoftness: 0.18,       // world units of vertical soft padding
-        horizonSoftness: 6.0,     // path-length fade for grazing cloud rays
+        horizonSoftness: 1.0,     // test: much shorter horizon path fade
         maxMarchUnits: 80,        // raymarch cap; 30 was the old fixed cap
         // softEdges: false        // old hard-edged shell behaviour
         // Terrain occlusion for clouds. false draws clouds in front of the