f32/d2/rect.go
func (r Rectangle) Empty() bool {
	return r.Min[0] >= r.Max[0] || r.Min[1] >= r.Max[1]
}
func (r Rectangle) Empty() bool {
	return r.Min[0] >= r.Max[0] || r.Min[1] >= r.Max[1]
}
// Empty reports whether the rectangle contains no points.