def __init__(self, center=np.array([0.0, 0.0, 0.0]), a=1.5, b=0.75, whichaxis='x'):
self.center = center
self.a = a
self.b = b
# shift to origin, rotate about axis
SurfOfRevolution.__init__(self, Ellipse, whichaxis, 1, np.array([0.0, 0.0, 0.0]), a, b)
# shift back
self.bounding_box = self.bounding_box + self.center
