lib/toxi/geom/vectors.js
function(theta){
			var co = Math.cos(theta);
			var si = Math.sin(theta);
			var zz = co *this.z - si * this.y;
			this.y = si * this.z + co * this.y;
			this.z = zz;
			return this;
		}
function(theta){
			var co = Math.cos(theta);
			var si = Math.sin(theta);
			var zz = co *this.z - si * this.y;
			this.y = si * this.z + co * this.y;
			this.z = zz;
			return this;
		}
function ( theta ) { var co = Math . cos ( theta ) ; var si = Math . sin ( theta ) ; var zz = co * this . z - si * this . y ; this . y = si * this . z + co * this . y ; this . z = zz ; return this ; }
Rotates the vector by the given angle around the X axis.

@param theta
the theta

@return itself
Rotates the vector by the given angle around the X axis .