Revert "config: reduce far cloud softening"

This reverts commit 6bedc2c95c.

config.js

@@ -335,14 +335,6 @@ window.CONFIG = {
             start: 0.35,          // world units: clouds fade out very close to camera
             end: 2.5              // full density from this distance onward
         },
-        // Far softening reduces detail/noise at long view distances. Lower
-        // max keeps the deck denser near the horizon and can remove the
-        // transparent ring around the terrain edge.
-        farSoft: {
-            start: 4,             // world units where far softening begins
-            end: 20,              // world units where max softening is reached
-            max: 0.35             // 1 = old behaviour, 0 = no far softening
-        },
         // Delay the volumetric cloud pass until the DEM/terrain mesh is
         // ready. This avoids clouds appearing over an unfinished ground model.
         waitForTerrain: true,     // false = draw clouds immediately

vendor/clouds3d.js

@@ -87,9 +87,6 @@ var FRAG_SRC = [
     'uniform float uCloudBot;',    // cloud deck lower edge (world Y)
     'uniform float uCloudNearFadeStart;',
     'uniform float uCloudNearFadeEnd;',
-    'uniform float uCloudFarSoftStart;',
-    'uniform float uCloudFarSoftEnd;',
-    'uniform float uCloudFarSoftMax;',
     'uniform sampler2D uElev;',    // terrarium RGB height grid, same UV as uGround
     'uniform float uElevOn;',      // terrain enabled (0/1)
     'uniform float uElevScale;',   // metres -> world units (incl. exaggeration)
@@ -726,7 +723,7 @@ var FRAG_SRC = [
                 'p += rd * (ign(gl_FragCoord.xy + vec2(float(i) * 7.13, float(i) * 3.71)) - 0.5) * stepSize * 0.25;',
                 'float alt = p.y + earthDrop(p.xz);',
                 'if (alt > uCloudTop + 0.1 || alt < uCloudBot - 0.1) break;',
-                'float soft = smoothstep(uCloudFarSoftStart, uCloudFarSoftEnd, t) * uCloudFarSoftMax;',
+                'float soft = smoothstep(4.0, 20.0, t);',
                 'float d = cloudDensitySpherical(p, alt, baseThresh, soft);',
                 'if (d > 0.02) {',
                     'float lit = clamp((alt - uCloudBot) / max(0.01, uCloudTop - uCloudBot), 0.0, 1.0);',
@@ -1313,9 +1310,6 @@ function init(canvas) {
         uCloudTop: uCloudTop, uCloudBot: uCloudBot,
         uCloudNearFadeStart: gl.getUniformLocation(prog, 'uCloudNearFadeStart'),
         uCloudNearFadeEnd: gl.getUniformLocation(prog, 'uCloudNearFadeEnd'),
-        uCloudFarSoftStart: gl.getUniformLocation(prog, 'uCloudFarSoftStart'),
-        uCloudFarSoftEnd: gl.getUniformLocation(prog, 'uCloudFarSoftEnd'),
-        uCloudFarSoftMax: gl.getUniformLocation(prog, 'uCloudFarSoftMax'),
         uElev: uElev, uElevOn: uElevOn, uElevScale: uElevScale, uTerrainExag: uTerrainExag,
         uSunDir: uSunDir, uMoonDir: uMoonDir, uMode: uMode,
         uAtmoModelOn: uAtmoModelOn, uAtmoHeightUnits: uAtmoHeightUnits,
@@ -1508,15 +1502,8 @@ if (window.CONFIG && window.CONFIG.clouds) {
 CLOUD_TOP = Math.max(0.2, Math.min(CLOUD_TOP, 2.0));
 CLOUD_BOT = Math.min(CLOUD_BOT, CLOUD_TOP - 0.4);
 var CLOUD_NEAR_FADE_CFG = (window.CONFIG && window.CONFIG.clouds && window.CONFIG.clouds.nearFade) || {};
-var CLOUD_FAR_SOFT_CFG = (window.CONFIG && window.CONFIG.clouds && window.CONFIG.clouds.farSoft) || {};
 var CLOUD_NEAR_FADE_START = (typeof CLOUD_NEAR_FADE_CFG.start === 'number') ? Math.max(0, CLOUD_NEAR_FADE_CFG.start) : 0.35;
 var CLOUD_NEAR_FADE_END = Math.max(CLOUD_NEAR_FADE_START + 0.1, (typeof CLOUD_NEAR_FADE_CFG.end === 'number') ? CLOUD_NEAR_FADE_CFG.end : 2.5);
-var CLOUD_FAR_SOFT_START = (typeof CLOUD_FAR_SOFT_CFG.start === 'number')
-    ? Math.max(0.1, CLOUD_FAR_SOFT_CFG.start) : 4.0;
-var CLOUD_FAR_SOFT_END = (typeof CLOUD_FAR_SOFT_CFG.end === 'number')
-    ? Math.max(CLOUD_FAR_SOFT_START + 0.1, CLOUD_FAR_SOFT_CFG.end) : 20.0;
-var CLOUD_FAR_SOFT_MAX = (typeof CLOUD_FAR_SOFT_CFG.max === 'number')
-    ? Math.max(0.0, Math.min(1.0, CLOUD_FAR_SOFT_CFG.max)) : 1.0;
 var CLOUDS_ON = !(window.CONFIG && window.CONFIG.clouds && window.CONFIG.clouds.enabled === false);
 var CLOUDS_WAIT_FOR_TERRAIN = !(window.CONFIG && window.CONFIG.clouds && window.CONFIG.clouds.waitForTerrain === false);
 var CLOUD_TERRAIN_OCCLUSION = !(window.CONFIG && window.CONFIG.clouds && window.CONFIG.clouds.terrainOcclusion === false);
@@ -7403,9 +7390,6 @@ window.clouds3dRender = function(target) {
     gl.uniform1f(s.uCloudBot, CLOUD_BOT);
     gl.uniform1f(s.uCloudNearFadeStart, CLOUD_NEAR_FADE_START);
     gl.uniform1f(s.uCloudNearFadeEnd, CLOUD_NEAR_FADE_END);
-    gl.uniform1f(s.uCloudFarSoftStart, CLOUD_FAR_SOFT_START);
-    gl.uniform1f(s.uCloudFarSoftEnd, CLOUD_FAR_SOFT_END);
-    gl.uniform1f(s.uCloudFarSoftMax, CLOUD_FAR_SOFT_MAX);
 
     // Ground mosaic uniforms + periodic re-fetch trigger.
     // uGroundCenter is the world position (X, Z) of the centre tile's