constructor() {

			if ( THREE.BufferGeometryUtils === undefined ) {

				throw 'THREE.SimplifyModifier relies on THREE.BufferGeometryUtils';

			}

		}
Simplification Geometry Modifier
   - based on code and technique
	  - by Stan Melax in 1998
	  - Progressive Mesh type Polygon Reduction Algorithm
   - http://www.melax.com/polychop/