diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index 16f08f4..3ff7a54 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -206,9 +206,15 @@ var FRAG_SRC = [
         'vec2 offset = vec2(hitPoint.x, hitPoint.z) - uGroundCenter;',
         'vec2 rotated = vec2(offset.x * 0.0 + offset.y * 1.0, -offset.x * 1.0 + offset.y * 0.0);',
         'vec2 gUv = rotated / uGroundSize + 0.5;',
+        // Soft fade at UV edges so OOB samples blend to fog instead of producing a hard stripe.
+        'float perpFade = smoothstep(-0.08, 0.05, gUv.y) * smoothstep(1.08, 0.95, gUv.y);',
+        'float longFade = smoothstep(-0.08, 0.05, gUv.x) * smoothstep(1.08, 0.95, gUv.x);',
+        'float edgeFade = perpFade * longFade;',
         'vec3 groundCol = texture2D(uGround, gUv).rgb;',
         'float fogAmount = clamp(tGround / 14.0, 0.0, 1.0);',
         'groundCol = mix(groundCol, uBg, fogAmount);',
+        // Edge fade: ground smoothly disappears near canvas boundary.
+        'groundCol = mix(uBg, groundCol, edgeFade);',
         // Ground mask: full ground when looking down, none when up.
         'float gmask = (tGround > 0.0) ? smoothstep(0.0, -0.10, rd.y) : 0.0;',
         'col = mix(col, groundCol, gmask);',
@@ -277,7 +283,7 @@ var GROUND_TRAVEL_COS = 0.0;      // cos(90 deg)
 var GROUND_TRAVEL_SIN = 1.0;      // sin(90 deg)
 var GROUND_CORRIDOR_LONG = 25;    // tiles along travel direction (~3.5 min of flight at uSpeed=1)
 var GROUND_CORRIDOR_PERP = 5;     // tiles perpendicular to travel
-var GROUND_BUFFER_LONG = 3;       // refetch when this close to forward edge
+var GROUND_BUFFER_LONG = 1;       // refetch when this close to forward edge
 var GROUND_BUFFER_PERP = 1;       // refetch when this close to side edge
 // Passau tile at zoom 11
 var GROUND_BASE_X = 1099;
@@ -336,13 +342,13 @@ function rebuildGroundMosaic(centerTileX, centerTileY) {
     groundCenterTile = { x: centerTileX, y: centerTileY };
     var halfLong = Math.floor(GROUND_CORRIDOR_LONG / 2);
     var halfPerp = Math.floor(GROUND_CORRIDOR_PERP / 2);
-    // Clear with fog colour so the texture is never undefined
+    // Clear with fog colour so we don't get ghosting from old tiles
+    // at wrong canvas positions. The shader's edgeFade makes OOB
+    // samples blend smoothly to uBg, so the brief fog state during
+    // tile fetch is invisible.
     groundCtx.fillStyle = '#7c9aa1';
     groundCtx.fillRect(0, 0, groundCanvas.width, groundCanvas.height);
     var promises = [];
-    // Iterate the corridor in its own rotated frame (long, perp),
-    // then map each (long, perp) to a world tile via rotation and to
-    // a canvas pixel via the iteration indices.
     for (var perp = -halfPerp; perp <= halfPerp; perp++) {
         for (var lng = -halfLong; lng <= halfLong; lng++) {
             // Tile offset from camera in world (tile) coords, rotated