graph3d.box := false
graph3d.mesh := true
graph3d.view := standard
graph3d.perspective := true
graph3d.resolution := 35
graph3d.background := white
graph3d.contrast := 1/2
graph3d.transparency := 0
graph3d.highlight := 1
graph3d.shading := 0
graph3d.color := byheight
graph3d.minimumx := -9
graph3d.maximumx := 3
graph3d.minimumy := -6
graph3d.maximumy := 6
graph3d.minimumz := -3
graph3d.maximumz := 3
; The "swallow tail" bifurcation set (a hypersurface) - "a" 
; is one of its 3 parameters, and x and y are the other two. 
; Vary a with the scrollbar to get various level surfaces. To
; get a more complete idea, switch a with x and then with
; y and repeat the scrollbar process.
graph3d( ( z^5+x*z^3+9*sin(time/3)*z+y=0 ) )