function ExtrudeGeometry( shapes, options ) {

		Geometry.call( this );

		this.type = 'ExtrudeGeometry';

		this.parameters = {
			shapes: shapes,
			options: options
		};

		this.fromBufferGeometry( new ExtrudeBufferGeometry( shapes, options ) );
		this.mergeVertices();

	}
@author zz85 / http://www.lab4games.net/zz85/blog

Creates extruded geometry from a path shape.

parameters = {

 curveSegments: <int>, // number of points on the curves
 steps: <int>, // number of points for z-side extrusions / used for subdividing segments of extrude spline too
 amount: <int>, // Depth to extrude the shape

 bevelEnabled: <bool>, // turn on bevel
 bevelThickness: <float>, // how deep into the original shape bevel goes
 bevelSize: <float>, // how far from shape outline is bevel
 bevelSegments: <int>, // number of bevel layers

 extrudePath: <THREE.Curve> // curve to extrude shape along
 frames: <Object> // containing arrays of tangents, normals, binormals

 UVGenerator: <Object> // object that provides UV generator functions

}