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
 depth: <float>, // 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

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

}