import grid3;

size(10cm,0,IgnoreAspect);
currentprojection=orthographic(0.25,1,0.25);
limits((-2,-2,0),(0,2,2));

real Step=0.5, step=0.25;
xaxis3(Label("$x$",position=EndPoint,align=Z), YZEquals(-2,0,extend=false),
       Ticks3(Label(align=-Y),
              Step=Step, step=step,
              gridroutine=XYgrid,
              pGrid=red, pgrid=0.5red));

yaxis3(Label("$y$",position=EndPoint,align=Z), XZEquals(-2,0),
       Ticks3(Label(align=-X), Step=Step, step=step,
              gridroutine=YXgrid,
              pGrid=red, pgrid=0.5red));

zaxis3("$z$", XYEquals(-1,0), RightTicks3(Label(align=-X-Y)));