Mark and Shonner

Thanks for your advice.

I still don't get this *.hxn to C5 problem. All Normals are facing the correct way. The message I get from C5 is this:-

“An unknown error occurred while executing Open…”

The screen shots below show the model in wire form. This object was constructed using 3D primitives, Vertex tools and Boolean. After every boolean and vertex construction I have welded the objects - to make them watertight.

Mark, the obj issue is relatively small and with this model easily put right. In C5, I deleted the two offending faces, used existing vertex points to construct new ones - job done. These two offending faces which were big enough to distort the model but when re-worked in C5 - no problem, minimum fuss and effort.

Wireframe Shot attached

Thanks