Creates a tube that extrudes along a 3d curve.
		function CustomSinCurve( scale ) {
			THREE.Curve.call( this );
			this.scale = ( scale === undefined ) ? 1 : scale;
		}
		CustomSinCurve.prototype = Object.create( THREE.Curve.prototype );
		CustomSinCurve.prototype.constructor = CustomSinCurve;
		CustomSinCurve.prototype.getPoint = function ( t ) {
			var tx = t * 3 - 1.5;
			var ty = Math.sin( 2 * Math.PI * t );
			var tz = 0;
			return new THREE.Vector3( tx, ty, tz ).multiplyScalar( this.scale );
		};
		var path = new CustomSinCurve( 10 );
		var geometry = new THREE.TubeGeometry( path, 20, 2, 8, false );
		var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
		var mesh = new THREE.Mesh( geometry, material );
		scene.add( mesh );
		
		
		path — [page:Curve] - A path that inherits from the [page:Curve] base class
		tubularSegments — [page:Integer] - The number of segments that make up the tube, default is 64
		radius — [page:Float] - The radius of the tube, default is 1
		radialSegments — [page:Integer] - The number of segments that make up the cross-section, default is 8 
		closed — [page:Boolean] Is the tube open or closed, default is false 
		
See the base [page:Geometry] class for common properties.
An object with a property for each of the constructor parameters. Any modification after instantiation does not change the geometry.
An array of [page:Vector3] tangents
An array of [page:Vector3] normals
An array of [page:Vector3] binormals
See the base [page:Geometry] class for common methods.
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]