config: allow clouds in front of terrain

config.js

@@ -339,6 +339,11 @@ window.CONFIG = {
         // ready. This avoids clouds appearing over an unfinished ground model.
         waitForTerrain: true,     // false = draw clouds immediately
         // waitForTerrain: false
+        // Terrain occlusion for clouds. false draws clouds in front of the
+        // terrain mesh even when terrain is closer; true clips cloud rays
+        // against the terrain distance buffer.
+        terrainOcclusion: false,  // inverted occlusion: clouds stay in front
+        // terrainOcclusion: true
         // Coverage per weather level, 0 = clear, 1 = overcast. Only the
         // levels listed here override the built-in defaults
         // (sunny 0.20, cloudy 0.70, stormy 0.80, night 0.45). Live weather