正四面体
http://reference.wolfram.com/language/PolyhedronOperations/tutorial/PolyhedronOperations.ja.html

遠近法をやめる
http://mathematica.stackexchange.com/questions/28600/how-to-get-rid-of-the-perspective-effect-in-a-3d-graphics

http://mathematica.stackexchange.com/questions/28578/switching-among-view-points-in-a-manipulate-expression

簡単には、ViewPoint->{0,0,1000}

でいけるようだ。