transform root
Transform
{ translation -1.5 -1.5 0 children [
Shape
{ geometry DEF nurb NurbsSurface { uOrder 4 vOrder 4 uDimension 4 vDimension 4 uKnot [ 0, 0, 0, 0, 3, 3, 3, 3] vKnot [ 0, 0, 0, 0, 3, 3, 3, 3]