snap

examples/app_hub/assets/hub-globe.js

@@ -1,7 +1,7 @@
 /**
  * Hub landing globe — orthographic Canvas2D (globe3d=1).
- * Phase 1: E–W parallels only (SVG hub ellipses → body → Y-rotation → canvas stroke).
+ * Grid: hub SVG ellipses (E–W) + meridian paths (N–S) traced on sphere, then Y-rotated.
- * Phase 2 (after confirm): N–S meridians from SVG.
+ * Land: ortho hub disk on front face; mercator-flat only on back wrap (avoids front squeeze).
  */
 export const GLOBE_VIEW = { imgW: 1920, imgH: 1080, cx: 720, cy: 560, r: 322, rim: 330 };
 
@@ -12,13 +12,42 @@ const FRONT_Z = 0.04;
 const RASTER_SCALE = 2;
 const AXIS_STEPS = 160;
 
-/** Same ellipses as hub-logo-fragment-globe-grid-overlay.svg (E–W / parallel to equator). */
+/** hub-logo-fragment-globe-grid-overlay.svg — E–W parallels. */
 const HUB_EW_PARALLELS = [
-  { cx: 720, cy: 560, rx: 318, ry: 11, width: 7.5, bright: true },
+  { cx: 720, cy: 560, rx: 318, ry: 11, bright: true },
-  { cx: 720, cy: 392, rx: 260, ry: 39, width: 7.5, bright: false },
+  { cx: 720, cy: 392, rx: 260, ry: 39, bright: false },
-  { cx: 720, cy: 728, rx: 260, ry: 39, width: 7.5, bright: false },
+  { cx: 720, cy: 728, rx: 260, ry: 39, bright: false },
 ];
 
+/** Same SVG — N–S meridians (line + quadratic beziers). */
+const HUB_NS_MERIDIANS = [
+  { prime: true, points: sampleLinePoints(720, 248, 720, 872, AXIS_STEPS) },
+  { prime: false, points: sampleQuadPoints(620, 248, 358, 560, 620, 872, AXIS_STEPS) },
+  { prime: false, points: sampleQuadPoints(820, 248, 1082, 560, 820, 872, AXIS_STEPS) },
+];
+
+function sampleLinePoints(x0, y0, x1, y1, steps) {
+  const pts = [];
+  for (let i = 0; i <= steps; i++) {
+    const t = i / steps;
+    pts.push({ x: x0 + (x1 - x0) * t, y: y0 + (y1 - y0) * t });
+  }
+  return pts;
+}
+
+function sampleQuadPoints(x0, y0, cx, cy, x1, y1, steps) {
+  const pts = [];
+  for (let i = 0; i <= steps; i++) {
+    const t = i / steps;
+    const u = 1 - t;
+    pts.push({
+      x: u * u * x0 + 2 * u * t * cx + t * t * x1,
+      y: u * u * y0 + 2 * u * t * cy + t * t * y1,
+    });
+  }
+  return pts;
+}
+
 function hubAsset(rel, build) {
   const link = document.querySelector('link[href*="hub.css"]');
   const base = link ? (link.getAttribute('href') || '').replace(/[^/]*$/, '') : '';
@@ -137,6 +166,17 @@ function hubPixelToBody(hpX, hpY) {
   };
 }
 
+function hubPointsToBodyRing(points) {
+  const out = [];
+  for (let i = 0; i < points.length; i++) {
+    const body = hubPixelToBody(points[i].x, points[i].y);
+    if (body) {
+      out.push(body);
+    }
+  }
+  return out;
+}
+
 function ellipseBodyRing(ellipse, steps) {
   const out = [];
   for (let i = 0; i <= steps; i++) {
@@ -165,6 +205,18 @@ function parallelStyle(bright, scale, z) {
   };
 }
 
+function meridianStyle(prime, scale, z) {
+  const t = Math.max(0, Math.min(1, (z - FRONT_Z) / (0.95 - FRONT_Z)));
+  if (t <= 0) {
+    return null;
+  }
+  const alpha = prime ? 0.5 + 0.48 * t : 0.3 + 0.45 * t;
+  return {
+    color: 'rgba(238,245,255,' + alpha.toFixed(3) + ')',
+    width: Math.max(prime ? 3 : 2.5, scale * (prime ? 0.0095 : 0.008)) * (0.45 + 0.55 * t),
+  };
+}
+
 function strokeBodyRing(ctx, cx, cy, r, rotY, bodies, styleAt) {
   let run = [];
 
@@ -210,20 +262,25 @@ function strokeBodyRing(ctx, cx, cy, r, rotY, bodies, styleAt) {
   flush();
 }
 
-/** Phase 1 — E–W hub parallels (equator + pole ellipses from SVG). */
+/** Hub SVG grid: E–W ellipses + N–S meridian paths (matches globe3d=0 artwork geometry). */
-function drawEwParallels(ctx, cx, cy, r, rotY, layoutScale) {
+function drawHubGrid(ctx, cx, cy, r, rotY, layoutScale) {
   ctx.save();
   ctx.beginPath();
   ctx.arc(cx, cy, r, 0, Math.PI * 2);
   ctx.clip();
 
   HUB_EW_PARALLELS.forEach(function (ellipse) {
-    const ring = ellipseBodyRing(ellipse, AXIS_STEPS);
+    strokeBodyRing(ctx, cx, cy, r, rotY, ellipseBodyRing(ellipse, AXIS_STEPS), function (z) {
-    strokeBodyRing(ctx, cx, cy, r, rotY, ring, function (z) {
       return parallelStyle(ellipse.bright, layoutScale, z);
     });
   });
 
+  HUB_NS_MERIDIANS.forEach(function (mer) {
+    strokeBodyRing(ctx, cx, cy, r, rotY, hubPointsToBodyRing(mer.points), function (z) {
+      return meridianStyle(mer.prime, layoutScale, z);
+    });
+  });
+
   ctx.restore();
 }
 
@@ -254,12 +311,27 @@ function isLandPixel(r, g, b, a) {
   return a > 10 && r > 100 && g < 140 && b < 140;
 }
 
+/** Light hub grid strokes baked into hub-logo-fragment-globe.svg (vector grid drawn separately). */
+function isGridPixel(r, g, b, a) {
+  if (a < 12) {
+    return false;
+  }
+  const lum = r * 0.299 + g * 0.587 + b * 0.114;
+  if (lum < 125) {
+    return false;
+  }
+  if (g < 155 || b < 155) {
+    return false;
+  }
+  return Math.max(r, g, b) - Math.min(r, g, b) < 85;
+}
+
 function sampleOceanRgba(globe, tex) {
   if (tex.z <= FRONT_Z) {
     return [OCEAN_FALLBACK.r, OCEAN_FALLBACK.g, OCEAN_FALLBACK.b, 255];
   }
   const s = sampleHub(globe, tex);
-  if (s[3] > 8) {
+  if (s[3] > 8 && !isGridPixel(s[0], s[1], s[2], s[3])) {
     return [s[0], s[1], s[2], 255];
   }
   return [OCEAN_FALLBACK.r, OCEAN_FALLBACK.g, OCEAN_FALLBACK.b, 255];
@@ -271,6 +343,10 @@ function sampleLandRgba(continents, mercFlat, tex) {
     if (ortho[3] > 6) {
       return ortho;
     }
+    return null;
+  }
+  if (tex.z > -FRONT_Z) {
+    return null;
   }
   const ll = texLonLat(tex);
   const flat = sampleMercFlat(mercFlat, ll.lon, ll.lat);
@@ -467,7 +543,7 @@ export async function mountHubGlobe(stage, opts) {
         return l || [0, 0, 0, 0];
       })
     );
-    drawEwParallels(ctx, cx, cy, r, rotation, layoutScale);
+    drawHubGrid(ctx, cx, cy, r, rotation, layoutScale);
     drawRim(ctx, globeImg, cx, cy, r, rim, layoutScale);
     ctx.save();
     ctx.beginPath();
@@ -537,7 +613,7 @@ export async function mountHubGlobe(stage, opts) {
 
   raf = requestAnimationFrame(tick);
   stage.dataset.globe3d = 'active';
-  stage.dataset.globeAxis = 'ew-parallels';
+  stage.dataset.globeAxis = 'ew-ns-grid';
 
   return {
     destroy() {

examples/app_hub/index.php

@@ -180,7 +180,7 @@ unset($__platformDir);
       var supportsLayout = !!(window.CSS && CSS.supports && CSS.supports('object-fit', 'cover'));
       var logoEnabled = !!(stage && supportsSvg && supportsLayout);
 
-      var logoBuild = '20260606globe12';
+      var logoBuild = '20260606globe14';
 
       function hubAsset(rel) {
         var link = document.querySelector('link[href*="hub.css"]');