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config: reduce far cloud softening

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Richard Zink committed 2026-10-13 14:46:06 +02:00
1 parent bebfd64902
commit 6bedc2c95c
2 files changed
+25 -1
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config.js
+8
View File
@@ -335,6 +335,14 @@ 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
Vendored
+17 -1
View File
@@ -87,6 +87,9 @@ 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)
@@ -723,7 +726,7 @@ 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(4.0, 20.0, t);',
'float soft = smoothstep(uCloudFarSoftStart, uCloudFarSoftEnd, t) * uCloudFarSoftMax;',
'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);',
@@ -1310,6 +1313,9 @@ 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,
@@ -1502,8 +1508,15 @@ 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);
@@ -7390,6 +7403,9 @@ 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