I want to clad a clipping spline with an element, in this case a simple box. I have the spline, the element, and the 2D array connected together with the clipping checkmark checked. Everything works great if I use a max generated splines or splines created from objects generated in 3ds max. It does not work with splines created from imported geometry that was converted into an editable poly. My element is imported from Revit as an ascis object, then converted into an editable poly. The spline extracted from it seems to be fine, but it does not work as a clipping area: I can set it, but nothing is generated.