app.js

@@ -3175,6 +3175,9 @@ init().then(() => {
   ];
   demoMemories.forEach(m => SpatialMemory.placeMemory(m));
 
+  // Gravity well clustering — attract related crystals, bake positions (issue #1175)
+  SpatialMemory.runGravityLayout();
+
   fetchGiteaData();
   setInterval(fetchGiteaData, 30000);
   runWeeklyAudit();

nexus/components/spatial-memory.js

@@ -456,6 +456,81 @@ const SpatialMemory = (() => {
     return count;
   }
 
+  // ─── GRAVITY WELL CLUSTERING ──────────────────────────
+  // Force-directed layout: same-category crystals attract, unrelated repel.
+  // Run on load (bake positions, not per-frame). Spec from issue #1175.
+  const GRAVITY_ITERATIONS = 20;
+  const ATTRACT_FACTOR = 0.10; // 10% closer to same-category centroid per iteration
+  const REPEL_FACTOR   = 0.05; // 5% away from nearest unrelated crystal
+
+  function runGravityLayout() {
+    const objs = Object.values(_memoryObjects);
+    if (objs.length < 2) {
+      console.info('[Mnemosyne] Gravity layout: fewer than 2 crystals, skipping');
+      return;
+    }
+    console.info('[Mnemosyne] Gravity layout starting —', objs.length, 'crystals,', GRAVITY_ITERATIONS, 'iterations');
+
+    for (let iter = 0; iter < GRAVITY_ITERATIONS; iter++) {
+      // Accumulate displacements before applying (avoids order-of-iteration bias)
+      const dx = new Float32Array(objs.length);
+      const dy = new Float32Array(objs.length);
+      const dz = new Float32Array(objs.length);
+
+      objs.forEach((obj, i) => {
+        const pos = obj.mesh.position;
+        const cat  = obj.region;
+
+        // ── Attraction toward same-category centroid ──────────────
+        let sx = 0, sy = 0, sz = 0, sameCount = 0;
+        objs.forEach(o => {
+          if (o === obj || o.region !== cat) return;
+          sx += o.mesh.position.x;
+          sy += o.mesh.position.y;
+          sz += o.mesh.position.z;
+          sameCount++;
+        });
+        if (sameCount > 0) {
+          dx[i] += ((sx / sameCount) - pos.x) * ATTRACT_FACTOR;
+          dy[i] += ((sy / sameCount) - pos.y) * ATTRACT_FACTOR;
+          dz[i] += ((sz / sameCount) - pos.z) * ATTRACT_FACTOR;
+        }
+
+        // ── Repulsion from nearest unrelated crystal ───────────────
+        let nearestDist = Infinity;
+        let rnx = 0, rny = 0, rnz = 0;
+        objs.forEach(o => {
+          if (o === obj || o.region === cat) return;
+          const ex = pos.x - o.mesh.position.x;
+          const ey = pos.y - o.mesh.position.y;
+          const ez = pos.z - o.mesh.position.z;
+          const d  = Math.sqrt(ex * ex + ey * ey + ez * ez);
+          if (d < nearestDist) {
+            nearestDist = d;
+            rnx = ex; rny = ey; rnz = ez;
+          }
+        });
+        if (nearestDist > 0.001 && nearestDist < Infinity) {
+          const len = Math.sqrt(rnx * rnx + rny * rny + rnz * rnz);
+          dx[i] += (rnx / len) * nearestDist * REPEL_FACTOR;
+          dy[i] += (rny / len) * nearestDist * REPEL_FACTOR;
+          dz[i] += (rnz / len) * nearestDist * REPEL_FACTOR;
+        }
+      });
+
+      // Apply displacements
+      objs.forEach((obj, i) => {
+        obj.mesh.position.x += dx[i];
+        obj.mesh.position.y += dy[i];
+        obj.mesh.position.z += dz[i];
+      });
+    }
+
+    // Bake final positions to localStorage
+    saveToStorage();
+    console.info('[Mnemosyne] Gravity layout complete — positions baked to localStorage');
+  }
+
   // ─── SPATIAL SEARCH ──────────────────────────────────
   function searchNearby(position, maxResults, maxDist) {
     maxResults = maxResults || 10;
@@ -516,7 +591,8 @@ const SpatialMemory = (() => {
     getMemoryAtPosition, getRegionAtPosition, getMemoriesInRegion, getAllMemories,
     getCrystalMeshes, getMemoryFromMesh, highlightMemory, clearHighlight, getSelectedId,
     exportIndex, importIndex, searchNearby, REGIONS,
-    saveToStorage, loadFromStorage, clearStorage
+    saveToStorage, loadFromStorage, clearStorage,
+    runGravityLayout
   };
 })();