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.agents/skills/reveal-3d/code/reveal/hooks/useRemoveNonReferencedModels.ts

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+import { useEffect, useRef } from 'react';
+import type { Cognite3DViewer } from '@cognite/reveal';
+
+/**
+ * Automatically removes models from the viewer that are no longer referenced
+ * by the current component tree. Prevents memory accumulation when using
+ * RevealKeepAlive for viewer persistence (50-70% memory reduction on navigation).
+ */
+export function useRemoveNonReferencedModels(
+  viewer: Cognite3DViewer | null,
+  activeModelKeys: Set<string>
+) {
+  const prevKeysRef = useRef<Set<string>>(new Set());
+
+  useEffect(() => {
+    if (!viewer) return;
+
+    const removed = [...prevKeysRef.current].filter((k) => !activeModelKeys.has(k));
+
+    for (const key of removed) {
+      const [modelIdStr, revisionIdStr] = key.split('-');
+      const modelId = parseInt(modelIdStr, 10);
+      const revisionId = parseInt(revisionIdStr, 10);
+
+      if (isNaN(modelId) || isNaN(revisionId)) continue;
+
+      const model = viewer.models.find(
+        (m) => m.modelId === modelId && m.revisionId === revisionId
+      );
+
+      if (model) {
+        try {
+          viewer.removeModel(model);
+        } catch (error) {
+          console.error(
+            `[useRemoveNonReferencedModels] Error removing model ${key}:`,
+            error
+          );
+        }
+      }
+    }
+
+    prevKeysRef.current = new Set(activeModelKeys);
+  }, [viewer, activeModelKeys]);
+}