Not all Bent Tube shapes can be modeled with PhotoModeler; here are some limitations:
• They cannot be closed. They cannot be a closed circle for example. If you wanted to model the tubing in a boat steering wheel, you would need to do the top and bottom halves separately (and not reference/join them).
• They can be a U or S shape but not an O shape. Nor a C shape where the where there is a lot of overlap at the ends on the main curve – i.e. a C shape where ends are almost closed like an O will not work.