min( v ) {

		this.x = Math.min( this.x, v.x );
		this.y = Math.min( this.y, v.y );
		this.z = Math.min( this.z, v.z );

		return this;

	}
If this vector's x, y or z value is greater than the given vector's x, y or z
value, replace that value with the corresponding min value.

@param {Vector3} v - The vector.
@return {Vector3} A reference to this vector.