/**
* Constructor for Math_Vector3
*
* @access public
* @param mixed $arg an array of values, a Math_Tuple object or a Math_Vector3 object
*/
public function __construct($arg)
{
if (is_array($arg) && count($arg) != 3) {
$this->tuple = null;
} elseif (is_object($arg) && (strtolower(get_class($arg)) != "math_vector3" && strtolower(get_class($arg)) != "math_tuple")) {
$this->tuple = null;
} elseif (is_object($arg) && strtolower(get_class($arg)) == "math_tuple" && $arg->getSize() != 3) {
$this->tuple = null;
} else {
parent::__construct($arg);
}
}
