Consider the following: draw(gr3d(explicit(x^2 - 2*y^2,x,-2,2,y,-3,3)),gr3d(explicit(x + y,x,-2,2,y,-3,3))); This produces two 3d plots, one above the other. Using the left or middle mouse key to magnify and/or rotate the two fitures makes the upper plot disappear and works only with the lower plot thereafter.. -Cheers, -sen