function Vector3( x, y, z ) {

		this.x = x || 0;
		this.y = y || 0;
		this.z = z || 0;

	}
@author mrdoob / http://mrdoob.com/
@author *kile / http://kile.stravaganza.org/
@author philogb / http://blog.thejit.org/
@author mikael emtinger / http://gomo.se/
@author egraether / http://egraether.com/
@author WestLangley / http://github.com/WestLangley