processScene( scene ) {

			const json = this.json;
			const options = this.options;

			if ( ! json.scenes ) {

				json.scenes = [];
				json.scene = 0;

			}

			const sceneDef = {};
			if ( scene.name !== '' ) sceneDef.name = scene.name;
			json.scenes.push( sceneDef );
			const nodes = [];

			for ( let i = 0, l = scene.children.length; i < l; i ++ ) {

				const child = scene.children[ i ];

				if ( child.visible || options.onlyVisible === false ) {

					const nodeIndex = this.processNode( child );
					if ( nodeIndex !== null ) nodes.push( nodeIndex );

				}

			}

			if ( nodes.length > 0 ) sceneDef.nodes = nodes;
			this.serializeUserData( scene, sceneDef );

		}
Process THREE.Scene
@param  {Scene} node THREE.Scene to process