cars: add time-based traffic profile with weekend and Sunday peaks

config.js

@@ -317,7 +317,28 @@ window.CONFIG = {
         spreadFloor: 0.30,        // share that far side roads keep
         speed: 1.0,               // flow speed multiplier
         density: 1.0,             // vehicle density multiplier
-        brightness: 1.3           // vehicle light intensity
+        brightness: 1.3,          // vehicle light intensity
+        // Time-based traffic profile. Values are multipliers around the
+        // configured density. Times are local scene-clock hours.
+        timeProfile: {
+            enabled: true,
+            weekday: 1.0,         // Mon-Fri base traffic
+            saturday: 0.65,       // weekend reduction
+            sunday: 0.55,         // weekend reduction
+            morningPeak: 7.7,     // rush-hour morning peak
+            morningWidth: 1.2,    // gaussian sigma in hours
+            morningGain: 0.55,    // +55 % at the peak
+            eveningPeak: 17.5,    // rush-hour evening peak
+            eveningWidth: 1.4,
+            eveningGain: 0.75,    // +75 % at the peak
+            fridayEveningGain: 0.35,
+            sundayEveningPeak: 18.5,
+            sundayEveningWidth: 1.8,
+            sundayEveningGain: 0.85, // commuter return traffic
+            nightReduction: 0.70  // deep-night traffic reduced to 30 %
+            // timeProfile: { enabled: false }
+            // timeProfile: { morningGain: 0.8, eveningGain: 1.0, nightReduction: 0.85 }
+        }
         // speed: 2.0, density: 0.6, brightness: 1.0
     },
 

vendor/clouds3d.js

@@ -3359,6 +3359,58 @@ var CAR_LANE_PX = CAR_TUN.lanePx || 2.6;
 var CAR_BRIGHT = CAR_TUN.brightness || 1.3;
 var CAR_SPEED = CAR_TUN.speed || 1;
 var CAR_DENS = CAR_TUN.density || 1;
+var CAR_TIME_CFG = CAR_TUN.timeProfile || {};
+var CAR_TIME_ON = CAR_TIME_CFG.enabled !== false;
+function carSmoothstep(a, b, x) {
+    var t = Math.max(0, Math.min(1, (x - a) / Math.max(1e-6, b - a)));
+    return t * t * (3 - 2 * t);
+}
+function carGaussian(hh, center, width) {
+    var d = hh - center;
+    if (d > 12) d -= 24;
+    if (d < -12) d += 24;
+    var w = Math.max(0.25, width);
+    return Math.exp(-(d * d) / (2 * w * w));
+}
+function carWeekendFactor(dow, hh) {
+    var sat = (typeof CAR_TIME_CFG.saturday === 'number') ? CAR_TIME_CFG.saturday : 0.65;
+    var sun = (typeof CAR_TIME_CFG.sunday === 'number') ? CAR_TIME_CFG.sunday : 0.55;
+    var work = (typeof CAR_TIME_CFG.weekday === 'number') ? CAR_TIME_CFG.weekday : 1.0;
+    function wOf(d) { return d === 0 ? sun : (d === 6 ? sat : work); }
+    var f = wOf(dow);
+    if (hh >= 23) f = f + (wOf((dow + 1) % 7) - f) * (hh - 23);
+    else if (hh < 1) f = wOf((dow + 6) % 7) + (f - wOf((dow + 6) % 7)) * hh;
+    return Math.max(0.15, Math.min(1.5, f));
+}
+function carRushFactor(hh, dow) {
+    if (!CAR_TIME_ON || typeof hh !== 'number') return 1;
+    var morningPeak = (typeof CAR_TIME_CFG.morningPeak === 'number') ? CAR_TIME_CFG.morningPeak : 7.7;
+    var morningWidth = (typeof CAR_TIME_CFG.morningWidth === 'number') ? CAR_TIME_CFG.morningWidth : 1.2;
+    var morningGain = (typeof CAR_TIME_CFG.morningGain === 'number') ? CAR_TIME_CFG.morningGain : 0.55;
+    var eveningPeak = (typeof CAR_TIME_CFG.eveningPeak === 'number') ? CAR_TIME_CFG.eveningPeak : 17.5;
+    var eveningWidth = (typeof CAR_TIME_CFG.eveningWidth === 'number') ? CAR_TIME_CFG.eveningWidth : 1.4;
+    var eveningGain = (typeof CAR_TIME_CFG.eveningGain === 'number') ? CAR_TIME_CFG.eveningGain : 0.75;
+    var nightReduction = (typeof CAR_TIME_CFG.nightReduction === 'number') ? CAR_TIME_CFG.nightReduction : 0.70;
+    var fridayGain = (typeof CAR_TIME_CFG.fridayEveningGain === 'number') ? CAR_TIME_CFG.fridayEveningGain : 0.35;
+    var sundayEveningPeak = (typeof CAR_TIME_CFG.sundayEveningPeak === 'number') ? CAR_TIME_CFG.sundayEveningPeak : 18.5;
+    var sundayEveningWidth = (typeof CAR_TIME_CFG.sundayEveningWidth === 'number') ? CAR_TIME_CFG.sundayEveningWidth : 1.8;
+    var sundayEveningGain = (typeof CAR_TIME_CFG.sundayEveningGain === 'number') ? CAR_TIME_CFG.sundayEveningGain : 0.85;
+
+    var rush = 1;
+    rush += morningGain * carGaussian(hh, morningPeak, morningWidth);
+    rush += eveningGain * carGaussian(hh, eveningPeak, eveningWidth);
+
+    if (dow === 5) rush += fridayGain * carGaussian(hh, 18.0, 1.6);
+    if (dow === 0) rush += sundayEveningGain * carGaussian(hh, sundayEveningPeak, sundayEveningWidth);
+
+    var nightEdge = -1;
+    if (hh >= 22) nightEdge = carSmoothstep(22, 24, hh);
+    else if (hh < 5) nightEdge = 1 - carSmoothstep(3, 5, hh);
+    if (nightEdge >= 0) rush *= 1 - nightReduction * nightEdge;
+
+    if (typeof dow === 'number') rush *= carWeekendFactor(dow, hh);
+    return Math.max(0.12, Math.min(2.2, rush));
+}
 // Gaussian spread of traffic around the motorway network: sigma (spreadKm)
 // and the floor that distant side roads keep (spreadFloor).
 var CAR_SIGMA = carMetres((CAR_TUN.spreadKm || 25) * 1000);
@@ -6590,30 +6642,12 @@ window.clouds3dRender = function(target) {
         var carPxScale = Math.max(0.45, Math.min(1.25, gl.drawingBufferHeight / 1080));
         var tCurve = Math.max(0, Math.min(1, (carNight - 0.10) / 0.40));
         tCurve = tCurve * tCurve * (3 - 2 * tCurve);   // smoothstep
-        // rush-hour shaping: busy evening/early morning, quiet 23:00-04:00
+        // Time-based traffic profile: weekday rush peaks, quiet deep night,
+        // reduced weekend traffic, and a Sunday-evening commuter bump.
         var rush = 1;
         var tDay = window.__currentDayProgress;
         if (typeof tDay === 'number') {
-            var hh = tDay * 24;
+            rush = carRushFactor(tDay * 24, window.__flightDow);
-            var nightPos = hh >= 23 ? (hh - 23) / 5 : (hh < 4 ? (hh + 1) / 5 : -1);
-            if (nightPos >= 0) {
-                var edge = Math.min(1, Math.min(nightPos, 1 - nightPos) * 5);
-                edge = edge * edge * (3 - 2 * edge);
-                rush = 1 - 0.65 * edge;                // dips to 0.35
-            }
-            // weekend factor (window.__flightDow: 0=Sun..6=Sat), blended
-            // smoothly over the hour around midnight so nothing pops
-            var dow = window.__flightDow;
-            if (typeof dow === 'number') {
-                var wOf = function (d) { return d === 0 ? 0.55 : (d === 6 ? 0.65 : 1); };
-                var fNow = wOf(dow);
-                if (hh >= 23) {
-                    fNow = fNow + (wOf((dow + 1) % 7) - fNow) * (hh - 23);
-                } else if (hh < 1) {
-                    fNow = wOf((dow + 6) % 7) + (fNow - wOf((dow + 6) % 7)) * hh;
-                }
-                rush *= fNow;
-            }
         }
         gl.useProgram(carProg);
         gl.uniformMatrix4fv(carUniforms.proj, false, proj);