a:= 1
a.minimum := -2
a.maximum := 2
b := 1
b.minimum := -2
b.maximum := 2
c := 1
c.minimum := -2
c.maximum := 2
d := 1
d.minimum := -2
d.maximum := 2
graph3d.box := true
graph3d.mesh := true
graph3d.view := standard
graph3d.perspective := true
graph3d.resolution := 70
graph3d.highlight := 0
graph3d.shading := .25
graph3d.contrast := 1/2
graph3d.transparency := 0
graph3d.color := .1*time
graph3d.background := black
graph3d.minimumx := -10
graph3d.maximumx := 10
graph3d.minimumy := -10
graph3d.maximumy := 10
graph3d.minimumz := -10
graph3d.maximumz := 10
GRAPH3D.STEPSU := 100
GRAPH3D.STEPSV := 20
GRAPH3D.MINIMUMU := 0
GRAPH3D.MAXIMUMU := 2*PI
GRAPH3D.MINIMUMV := 0
GRAPH3D.MAXIMUMV := 2*PI
GRAPH3D( CYLINDRICAL( 5+2*COS(V + .5*time), U + .2*time , 2*SIN(V + .5*time) ) )