I'd like to create a Geom_TrimmedSurface from a Geom_Plane. The Geom_Plane is the underlying Shape to a TopoDS_Face belonging to a box. It must have bounding parameters associated with it somewhere, how do I retrieve them? I'd like to create an Adaptor3d_Surface from the trimmed surface and work with that in a generic manner. I guess this isn't a problem with other parametric surfaces, but planes seem to be a bit different here.