constructor( manager ) {

			super( manager );
			this.availableExtensions = [];

		}
3D Manufacturing Format (3MF) specification: https://3mf.io/specification/

The following features from the core specification are supported:

- 3D Models
- Object Resources (Meshes and Components)
- Material Resources (Base Materials)

3MF Materials and Properties Extension are only partially supported.

- Texture 2D
- Texture 2D Groups
- THREE.Color Groups (Vertex Colors)
- Metallic Display Properties (PBR)