ThreeJS用2D点线生成3D几何体

本源码演示了使用Threejs库挤压生成算法-通过2D挤压生成3D造型几何体Extrusion，演示的例子是通过一个2D五角星边生成3D五角星，其它各种生成同理，采用2D生成。
部分源码

	//挤压生成算法-通过2D挤压生成3D造型Extrusion (Three.js)
	var starPoints = [];
	
	starPoints.push( new THREE.Vector2 (   0,  50 ) );
	starPoints.push( new THREE.Vector2 (  10,  10 ) );
	starPoints.push( new THREE.Vector2 (  40,  10 ) );
	starPoints.push( new THREE.Vector2 (  20, -10 ) );
	starPoints.push( new THREE.Vector2 (  30, -50 ) );
	starPoints.push( new THREE.Vector2 (   0, -20 ) );
	starPoints.push( new THREE.Vector2 ( -30, -50 ) );
	starPoints.push( new THREE.Vector2 ( -20, -10 ) );
	starPoints.push( new THREE.Vector2 ( -40,  10 ) );
	starPoints.push( new THREE.Vector2 ( -10,  10 ) );
	
	var starShape = new THREE.Shape( starPoints );

	var extrusionSettings = {
		size: 30, height: 4, curveSegments: 3,
		bevelThickness: 1, bevelSize: 2, bevelEnabled: false,
		material: 0, extrudeMaterial: 1
	};
	
	var starGeometry = new THREE.ExtrudeGeometry( starShape, extrusionSettings );
	
	var materialFront = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
	var materialSide = new THREE.MeshBasicMaterial( { color: 0xff8800 } );
	var materialArray = [ materialFront, materialSide ];
	var starMaterial = new THREE.MeshFaceMaterial(materialArray);
	
	var star = new THREE.Mesh( starGeometry, starMaterial );
	star.position.set(0,50,0);
	scene.add(star);
	
	// add a wireframe to model
	var wireframeTexture = new THREE.MeshBasicMaterial( { color: 0x000000, wireframe: true, transparent: true } ); 
	var star = new THREE.Mesh( starGeometry, wireframeTexture );
	star.position.set(0,50,0);
	scene.add(star);

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