import grid3;

size(10cm,0);
currentprojection=orthographic(.5,1,.5);

defaultpen(overwrite(SuppressQuiet));
bbox3 b=limits((-2,-2,0),(0,2,2));
aspect(b,1,1,1);

grid3(
       pic=currentpicture,            // picture (default=currentpicture)

       b=b,                           // bbox3 : the box.

       gridroutine=XYZgrid(           // gridtype3droutine or gridtype3droutine [] (alias gridtype3droutines)
                           //                         or gridtype3droutines []:
                           //                         The routine(s) to draw the grid(s);
                           //                         the values can be as follows:
                           //                            * XYgrid : draw grid from X in direction of Y
                           //                            * YXgrid : draw grid from Y in direction of X
                           //                                etc...
                           //                            * An array of previous values XYgrid, YXgrid, ...
                           //                            * XYXgrid : draw XYgrid and YXgrid grids
                           //                            * YXYgrid : draw XYgrid and YXgrid grids
                           //                            * ZXZgrid : draw ZXgrid and XZgrid grids
                           //                            * YX_YZgrid : draw YXgrid and YZgrid grids 
                           //                            * XY_XZgrid : draw XYgrid and XZgrid grids 
                           //                            * YX_YZgrid : draw YXgrid and YZgrid grids 
                           //                            * An array of previous values XYXgrid, YZYgrid, ...
                           //                            * XYZgrid : draw XYXgrid, ZYZgrid and XZXgrid grids.
                           pos=Relative(0)), // position (default=Relative(0)) :
       //                          this is the position of the grid relatively to
       //                          the perpendicular axe of the grid.
       //                          If 'pos' is a the real, 'pos' is a coordinate relativly to this axe.
       //                          Alias 'top=Relative(1)', 'middle=Relative(.5)'
       //                          and 'bottom=Relative(0)' can be used as value.
       
       // Following arguments are similar as the function 'Ticks'.
       N=0,                // int (default=0)
       n=0,                // int (default=0)
       Step=0,             // real (default=0)
       step=0,             // real (default=0)
       begin=true,         // bool (default=true)
       end=true,           // bool (default=true)
       pGrid=grey,         // pen (default=grey)
       pgrid=lightgrey,    // pen (default=lightgrey)
       put=Above,          // bool (default=Above)
       
       P=currentprojection // Projection to use (default=currentprojection).
       );

xaxis(Label("$x$",position=EndPoint,align=S), b, RightTicks());
yaxis(Label("$y$",position=EndPoint,align=S), b, RightTicks());
zaxis(Label("$z$",position=EndPoint,align=(0,.5)+W), b, RightTicks());

import grid3;

size(10cm,0);
currentprojection=orthographic(.5,1,.5);

defaultpen(overwrite(SuppressQuiet));
bbox3 b=limits((-2,-2,0),(0,2,2));
aspect(b,1,1,1);

scale(Linear, Linear, Log(automax=false));
grid3(b,XZXgrid);
grid3(b,XYXgrid);
xaxis(Label("$x$",position=EndPoint,align=S), b, RightTicks());
yaxis(Label("$y$",position=EndPoint,align=S), b, RightTicks());
zaxis(Label("$z$",position=EndPoint,align=(0,.5)+W), b, RightTicks());

import grid3;

size(10cm,0);
currentprojection=orthographic(.5,1,.5);

defaultpen(overwrite(SuppressQuiet));
bbox3 b=limits((-2,-2,0),(0,2,2));
aspect(b,1,1,1);

grid3(b, new grid3routines [] {XYXgrid(Relative(1)), XZXgrid(0)});
xaxis(Label("$x$",position=EndPoint,align=S), b, RightTicks());
yaxis(Label("$y$",position=EndPoint,align=S), b, RightTicks());
zaxis(Label("$z$",position=EndPoint,align=(0,.5)+W), b, RightTicks());

import grid3;

size(10cm,0);
currentprojection=orthographic(.5,1,.5);

defaultpen(overwrite(SuppressQuiet));
bbox3 b=limits((-2,-2,0),(0,2,2));
aspect(b,1,1,1);

grid3(b, new grid3routines [] {XYXgrid(-.5), XYXgrid(1.5)},
       pGrid=new pen[] {red, blue},
       pgrid=new pen[] {.5red, .5blue});
xaxis(Label("$x$",position=EndPoint,align=S), b, RightTicks());
yaxis(Label("$y$",position=EndPoint,align=S), b, RightTicks());
zaxis(Label("$z$",position=EndPoint,align=(0,.5)+W), b, RightTicks());

import grid3;

size(10cm,0);
currentprojection=orthographic(.5,1,.5);

defaultpen(overwrite(SuppressQuiet));
bbox3 b=limits((-2,-2,0),(0,2,2));
aspect(b,1,1,1);

real Step=.5, step=.2;
xaxis(Label("$x$",position=EndPoint,align=S), b,
      Ticks(Label(align=unit(project(-Y))),
            Step=Step, step=step,
            gridroutine=XYgrid,
            pGrid=red, pgrid=.5red));

yaxis(Label("$y$",position=EndPoint,align=S), b,
      Ticks(Label(align=unit(project(X))), Step=Step, step=step,
            gridroutine=YXgrid,
            pGrid=red, pgrid=.5red));

zaxis("$z$", b, RightTicks());

import grid3;

size(10cm,0);
currentprojection=orthographic(.5,1,.5);

defaultpen(overwrite(SuppressQuiet));
bbox3 b=limits((-2,-2,0),(0,2,2));
aspect(b,1,1,1);

xaxis(Label("$x$",position=EndPoint,align=S), b,
      RightTicks(Step=.5, gridroutine=XYgrid));
yaxis(Label("$y$",position=EndPoint,align=S), b,
      Ticks(Label("",align=.5project(X)),N=8,n=2, gridroutine=YX_YZgrid));
zaxis("$z$", b, RightTicks(ZYgrid));