feat(globe3d): ?ax spin factor and v11 continent transparency

Expose URL ?ax=N as auto-spin speed multiplier for all interactive globe
versions. On globe3d=11, render semi-transparent continent fill with
brighter coastline/border pixels matching the static SVG art.

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/hub-globe.js

@@ -13,6 +13,7 @@
  * globe3d=10: v4 visible-arc → screen ellipse (hub ry), disk-clipped.
  * globe3d=11: v10 grid + geographic mercator-flat land (360° U-wrap).
  *   ?latf=1.25&lngf=1&zy=1&zx=1&pp=0&pe=0 — land plate zoom + pole/limb lens pinch.
+ *   ?ax=2 — auto-spin speed factor (1 = default, 2 = double, …).
  */
 export const GLOBE_VIEW = { imgW: 1920, imgH: 1080, cx: 720, cy: 560, r: 322, rim: 330 };
 
@@ -52,6 +53,14 @@ function resolveLandZoom(raw) {
   };
 }
 
+/** URL ?ax=N — auto-spin speed multiplier (default 1). */
+function resolveSpinFactor(raw) {
+  if (typeof raw !== 'number' || !isFinite(raw)) {
+    return 1;
+  }
+  return Math.max(0.05, Math.min(8, raw));
+}
+
 /**
  * Land plate sample remap (globe3d=11 URL tunables):
  * latf/lngf — linear zoom; zy/zx — equator/prime-meridian mag (1 = uniform).
@@ -1025,6 +1034,27 @@ function hubContinentRgba(sample) {
   return [sample[0], sample[1], sample[2], 255];
 }
 
+/** Fill vs stroke from hub-logo-continents-mercator-flat.svg raster. */
+function classifyHubContinentPixel(r, g, b, a) {
+  if (a < 8) {
+    return null;
+  }
+  if (r > 168 && g > 198 && b > 218) {
+    return null;
+  }
+  const lum = r * 0.299 + g * 0.587 + b * 0.114;
+  if (lum < 92 || lum > 238) {
+    return null;
+  }
+  if (!(b >= 100 && g >= 95 && r >= 68)) {
+    return null;
+  }
+  if (lum >= 186 || (g > 198 && b > 212)) {
+    return 'border';
+  }
+  return 'fill';
+}
+
 /** Solid fill from rasterized globe SVG — skip gradient fringe / drop-shadow. */
 function isSolidContinentPixel(r, g, b, a) {
   if (a < 72) {
@@ -1107,17 +1137,44 @@ function sampleLandRgbaMercator(mercFlat, tex) {
   return null;
 }
 
-/** globe3d=11 — geographic mercator wrap (360°); z > LIMB_Z only. */
+/** globe3d=11 — geographic mercator wrap; semi-transparent fill + contrast borders. */
 function sampleLandVisibleHemisphere(mercFlat, tex, landZoom) {
   if (tex.z <= LIMB_Z) {
     return null;
   }
   const flat = sampleMercFlatFromTex(mercFlat, tex, landZoom);
-  if (isHubContinentPixel(flat[0], flat[1], flat[2], flat[3])) {
-    return hubContinentRgba(flat);
-  }
+  let kind = classifyHubContinentPixel(flat[0], flat[1], flat[2], flat[3]);
+  if (!kind) {
     return null;
   }
+  if (kind === 'fill') {
+    const ll = texLonLat(tex);
+    const mapped = landZoomLonLat(ll.lon, ll.lat, landZoom, tex);
+    const eps = 0.0035;
+    const neighbors = [
+      sampleMercFlat(mercFlat, mapped.lon + eps, mapped.lat),
+      sampleMercFlat(mercFlat, mapped.lon - eps, mapped.lat),
+      sampleMercFlat(mercFlat, mapped.lon, mapped.lat + eps),
+      sampleMercFlat(mercFlat, mapped.lon, mapped.lat - eps),
+    ];
+    for (let i = 0; i < neighbors.length; i++) {
+      const n = neighbors[i];
+      if (!classifyHubContinentPixel(n[0], n[1], n[2], n[3])) {
+        kind = 'border';
+        break;
+      }
+    }
+  }
+  if (kind === 'border') {
+    return [
+      Math.min(255, flat[0] + 18),
+      Math.min(255, flat[1] + 14),
+      Math.min(255, flat[2] + 8),
+      232,
+    ];
+  }
+  return [flat[0], flat[1], flat[2], 148];
+}
 
 function fillDiskRegion(ctx, cx, cy, r, rotY, fn) {
   const r2 = r * r;
@@ -1219,6 +1276,8 @@ export async function mountHubGlobe(stage, opts) {
   const reducedMotion = !!opts.reducedMotion;
   const renderVersion = Math.max(1, parseInt(opts.renderVersion, 10) || 1);
   const landZoom = resolveLandZoom(opts.landZoom);
+  const spinFactor = resolveSpinFactor(opts.spinFactor);
+  const spinTarget = AUTO_SPIN_RAD_S * spinFactor;
 
   const canvas = document.createElement('canvas');
   canvas.className = 'hub-globe-canvas';
@@ -1253,7 +1312,7 @@ export async function mountHubGlobe(stage, opts) {
   const mercFlat = rasterizeImage(mercatorFlatImg, mercW, mercH, 1);
 
   let rotation = typeof opts.initialRotationY === 'number' ? opts.initialRotationY : 0;
-  let angularVelocity = reducedMotion ? 0 : AUTO_SPIN_RAD_S;
+  let angularVelocity = reducedMotion ? 0 : spinTarget;
   let dragging = false;
   let lastPointerX = 0;
   let lastPointerTime = 0;
@@ -1391,7 +1450,7 @@ export async function mountHubGlobe(stage, opts) {
 
     if (!dragging) {
       if (!reducedMotion) {
-        const target = AUTO_SPIN_RAD_S;
+        const target = spinTarget;
         angularVelocity += (target - angularVelocity) * 1.2 * dt;
         if (Math.abs(angularVelocity - target) < 0.004) angularVelocity = target;
       } else {
@@ -1405,6 +1464,9 @@ export async function mountHubGlobe(stage, opts) {
 
   raf = requestAnimationFrame(tick);
   stage.dataset.globe3d = String(renderVersion);
+  if (spinFactor !== 1) {
+    stage.dataset.globeAx = String(spinFactor);
+  }
   if (renderVersion >= 11) {
     stage.dataset.globeLatf = String(landZoom.latf);
     stage.dataset.globeLngf = String(landZoom.lngf);
@@ -1441,6 +1503,7 @@ export async function mountHubGlobe(stage, opts) {
       canvas.remove();
       delete stage.dataset.globe3d;
       delete stage.dataset.globeAxis;
+      delete stage.dataset.globeAx;
       delete stage.dataset.globeLatf;
       delete stage.dataset.globeLngf;
       delete stage.dataset.globeZy;

index.php

@@ -187,7 +187,7 @@ function hub_h(string $s): string {
       var supportsLayout = !!(window.CSS && CSS.supports && CSS.supports('object-fit', 'cover'));
       var logoEnabled = !!(stage && supportsSvg && supportsLayout);
 
-      var logoBuild = '20260704globe29';
+      var logoBuild = '20260704globe31';
 
       function hubAsset(rel) {
         var link = document.querySelector('link[href*="hub.css"]');
@@ -268,6 +268,12 @@ function hub_h(string $s): string {
         var fLegacy = parseFloat(globeLatfLegacy);
         if (isFinite(fLegacy)) globeLandZoom.latf = fLegacy;
       }
+      var globeAxRaw = params.get('ax');
+      var globeSpinFactor = 1;
+      if (globeAxRaw !== null && globeAxRaw !== '') {
+        var axParsed = parseFloat(globeAxRaw);
+        if (isFinite(axParsed)) globeSpinFactor = axParsed;
+      }
       var useGlobe3d = logoEnabled && globe3dVersion !== 0;
       var globe3dLayers = { globe: true, continents: true, gridOverlay: true };
 
@@ -315,6 +321,9 @@ function hub_h(string $s): string {
           if (Object.keys(globeLandZoom).length > 0) {
             globeOpts.landZoom = globeLandZoom;
           }
+          if (globeSpinFactor !== 1) {
+            globeOpts.spinFactor = globeSpinFactor;
+          }
           var globeModuleUrl = new URL('assets/hub-globe.js', window.location.href);
           globeModuleUrl.searchParams.set('v', logoBuild);
           globeModuleUrl.searchParams.set('globe3d', String(globe3dVersion));