import graph3; size(8cm,0); currentprojection=orthographic(1,1,1); defaultpen(overwrite(SuppressQuiet)); bbox3 b=limits((-2,-2,0),(0,2,2)); aspect(b,1,1,1); yaxis("$y$", b, RightTicks(rotate(Y)*Label)); xaxis("$x$", b, RightTicks(rotate(X)*Label)); zaxis("$z$", b, RightTicks, p=red, arrow=Arrow);