import graph3; size(8cm,0); currentprojection=orthographic(1,1,1); defaultpen(overwrite(SuppressQuiet)); limits((0,-2,0),(2,2,2)); xaxis3("$x$", InTicks(XY()*Label)); yaxis3("$y$", InTicks(XY()*Label)); zaxis3("$z$", OutTicks, p=red, arrow=Arrow3);