diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index a7ad651..a6d95f7 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -712,6 +712,7 @@ function SelectionHandler() {
         if (o.geometry instanceof THREE.PlaneGeometry) return false;
         return true;
       });
+      console.log('[Selection] click', { intersects: intersects.length, hit: !!hit, hitName: hit?.object?.name, hitUserData: hit?.object?.userData });
       if (!hit) return;
 
       // Walk up to find ifcElement node AND the GLBModel root (carrying modelId)
@@ -723,11 +724,13 @@ function SelectionHandler() {
         if (!modelId && cur.userData?.modelId) modelId = cur.userData.modelId as string;
         cur = cur.parent;
       }
+      console.log('[Selection] walked', { foundIfcElement: !!element, modelId, elementName: element?.name });
       // Non-IFC fallback: pick the mesh itself
       if (!element) element = hit.object;
       if (!modelId) modelId = useModelStore.getState().activeModelId;
-      if (!modelId || !element) return;
+      if (!modelId || !element) { console.log('[Selection] aborted: no modelId/element'); return; }
       const key = elementKey(modelId, element);
+      console.log('[Selection] toggling', key);
       useModelStore.getState().toggleElementSelection(key);
     };