# GLTFStructuralMetadataExtension

class in `3d-tiles-renderer/three/plugins`

```js
import { GLTFStructuralMetadataExtension } from '3d-tiles-renderer/three/plugins';
```

GLTF loader plugin that parses the `EXT_structural_metadata`
extension and attaches a `StructuralMetadata` instance to `scene.userData.structuralMetadata`
(and to each primitive mesh). Register with a `GLTFLoader` via
`loader.register( () => new GLTFStructuralMetadataExtension() )`.

> **Note:** 64-bit integer types are not fully supported.

## Constructor

```js
new GLTFStructuralMetadataExtension( parser: Object )
```

- `parser`, `Object`: The GLTF parser instance provided by the loader.