Converting Guides to 3dsmax Splines 

Ornatrix guides (left) exported into 3dsmax as a shape (right) object using Edit Spline modifier

Any ornatrix guides can be quickly converted into 3dsmax shape (spline) object. You can simply add 'Edit Spline' or any other spline modifier on top of guides and Ornatrix will use guides as shape interchangeably. You may also convert spline objects back into guides (after subsequent editing, for example) using guides from shape modifier.

Cross section is applied straight on top of guides, followed by a surface modifier