function Vector4( x, y, z, w ) {

		this.x = x || 0;
		this.y = y || 0;
		this.z = z || 0;
		this.w = ( w !== undefined ) ? w : 1;

	}
@author supereggbert / http://www.paulbrunt.co.uk/
@author philogb / http://blog.thejit.org/
@author mikael emtinger / http://gomo.se/
@author egraether / http://egraether.com/
@author WestLangley / http://github.com/WestLangley