readMaterialGroup( data ) {

			this.readChunk( data );
			const name = this.readString( data, 64 );
			const numFaces = this.readWord( data );
			this.debugMessage( '         Name: ' + name );
			this.debugMessage( '         Faces: ' + numFaces );
			const index = [];

			for ( let i = 0; i < numFaces; ++ i ) {

				index.push( this.readWord( data ) );

			}

			return {
				name: name,
				index: index
			};

		}
Read material group data chunk.

@method readMaterialGroup
@param {Dataview} data Dataview in use.
@return {Object} Object with name and index of the object.