reverted last change (up is +z is very dumb esp. as worldspace is not) but added comments on math
reverted last change (up is +z is very dumb esp. as worldspace is not) but added comments on math


eponymous/pixie,eponymous/pixie,scorpion007/pixie,scorpion007/pixie,scorpion007/pixie,eponymous/pixie,eponymous/pixie,scorpion007/pixie