function EdgesHelper( object, hex, thresholdAngle ) {

        var color = ( hex !== undefined ) ? hex : 0xffffff;

        LineSegments.call( this, new EdgesGeometry( object.geometry, thresholdAngle ), new LineBasicMaterial( { color: color } ) );

        this.matrix = object.matrixWorld;
        this.matrixAutoUpdate = false;

    }
@author WestLangley / http://github.com/WestLangley
@param object THREE.Mesh whose geometry will be used
@param hex line color
@param thresholdAngle the minimum angle (in degrees),
between the face normals of adjacent faces,
that is required to render an edge. A value of 10 means
an edge is only rendered if the angle is at least 10 degrees.