(commands used to create the figure above)

>	p1:=plot3d(<0,u,v>,u=0..1,v=0..1): p2:=fieldplot3d(<3,0,0>,x=-1..1,y=0.1..0.9,z=0.1..0.9,color=red,arrows=THICK,grid=[4,4,4]): display(p1,p2,orientation=[40,70],axes=normal);

>