--- /dev/null
+
+package MOP::Point3D;
+
+use strict;
+use warnings;
+use metaclass;
+
+use base 'MOP::Point';
+
+__PACKAGE__->meta->add_attribute('z' => (accessor => 'z'));
+
+sub clear {
+ my $self = shift;
+ $self->SUPER::clear();
+ $self->z(0);
+}
+
+1;
+
+__END__
\ No newline at end of file