属性面板获取当前所选对象

src/editor/propEditors/IMetaProp.ts

@@ -28,6 +28,9 @@ export default defineComponent({
   computed: {
     object3D(): THREE.Object3D {
       return this.viewport.state.selectedObject
+    },
+    item(): ItemJson {
+      return this.viewport.state.selectedItem
     }
   }
 })