http://www.wakhok.ac.jp/%7Emomma/lec2001/Graphics_Programming/12/lecture12.html
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I