How can I assign only one colorbar for 2 hold on plots

Dear all; My problem is the following: I have two sufaces i want to plot, but i want that the colorbar shows the values of only one of them. This is because i'm plotting a wave field around a ship, and i'm not interested on representing the values of the ship surface(values of z let's say) on the colorbar, because this affects my colormap representation.

is there anyway that i can tell the colorbar just to take into account the values of the wave field, and forget the ship.

lets say that the ship surface is surf(X,Y,Z), and the wave fied is surf(X1,Y1,Z1)

I cant patch my ship because the panels are not ordered and there is no way i can tell wich points are on the border of the ship.

Best Regards Rod.