import grid3; 

size3(150,IgnoreAspect);

limits((0,0,0),(10,10,6));
currentprojection=perspective(camera=(20,16,7),target=(5,5,3));

triple pM=(7,4,3);
draw(box((0,0,0),pM),dotted+1bp);
dot("$M$",pM,N);
dot("O",(0,0,0),NE);

grid3(XYZgrid,Step=5,step=1);

xaxis3(Label("$x$",MidPoint,align=Y-Z),
       Bounds(Both,Min),OutTicks(endlabel=false),p=blue); 
yaxis3(Label("$y$",MidPoint,align=X-Z),
       Bounds(Both,Min),OutTicks(endlabel=false),p=red); 
zaxis3(Label("$z$",MidPoint,align=X-Y),
       Bounds(Both,Min),InTicks(),p=1bp+.5green);