diff --git a/config.js b/config.js
index f8209e0..d99dcf8 100644
--- a/config.js
+++ b/config.js
@@ -68,6 +68,7 @@ export const config = {
                             {
                                 label: 'Peplano / Platea',
                                 model: 'models/ssgp/Teatro_SSGP_Platea_peplano.glb',
+                                isSemantic: true,
                             },
                             {
                                 label: 'Ordini di palchi',
diff --git a/js/scene.js b/js/scene.js
index ccf5d5c..da9c2a8 100644
--- a/js/scene.js
+++ b/js/scene.js
@@ -46,6 +46,16 @@ function init () {
     AppState.exposure = config.scene.initialExposure;
 
     ATON.Nav.setUserControl(true);
+    // General hover/leave events handling for all existing semantic nodes.
+    ATON.on("SemanticNodeHover", (semid) =>{ // When hovering a semantic node...
+        let semNode = ATON.getSemanticNode(semid);
+        if (semNode) semNode.highlight();
+    });
+
+    ATON.on("SemanticNodeLeave", (semid) =>{
+        let semNode = ATON.getSemanticNode(semid);
+        if (semNode) semNode.restoreDefaultMaterial();
+    });
 }
 /**
  * @param {Object} marker - The marker object from config
@@ -67,8 +77,16 @@ export function openScene (marker, nodes) {
     toggleAmbientOcclusion(config.scene.ambientOcclusion);
     AppState.ambientOcclusion = config.scene.ambientOcclusion;
     AppState.root = ATON.getRootScene();
-}
 
+    // Add semantic nodes
+    for (let node of AppState.nodes) {
+        if (node.isSemantic) {
+            createSemanticNode(ATON.getSceneNode(node.id).getBound(), node.id);
+            // DEBUG!!
+            console.debug(ATON.getSceneNode(node.id).getBound());
+        }
+    }
+}
 /**
  * 
  * @param {Object[]} nodes 
@@ -104,10 +122,37 @@ function loadNodes(nodes) {
             AppState.clipping.boundingSphere = node.getBound();
         }
 
-        AppState.nodes.push({id: n.label, active: n.isInvisible ? false: true});
+        AppState.nodes.push({
+            id: n.label,
+            active: n.isInvisible ? false: true,
+            isSemantic: n.isSemantic
+        });
     });
     
     if (!AppState.clipping.boundingSphere) {
         console.error("No bounding sphere computed, clipping will fail. Ensure one node has 'isMain: true'.");
     }
 }
+/**
+ * Uses a generic sphere shape as semantic annotation
+ * @param {Sphere} bound The scene node's bounding sphere
+ * @param {string} id The original scene node ID (3D object)
+ * @returns {ATON.SceneNode}
+ */
+function createSemanticNode(bound, id) {
+    // Default/highlight materials for semantic node
+    let matSemDef = ATON.MatHub.materials.semanticShape;
+    let matSemHL  = ATON.MatHub.materials.semanticShapeHL;
+
+    const semNode = ATON.createSemanticNode(id) 
+        .setDefaultAndHighlightMaterials(matSemDef, matSemHL)
+        .attachToRoot();
+
+    const sphereCenter = bound.center;
+    const sphereRadius = bound.radius * 0.2;
+
+    let sphere = ATON.SemFactory.createSphere(id, sphereCenter, sphereRadius);
+
+    console.debug('Bound:', bound);
+    console.debug('Semantic sphere:', sphere);
+}