Hi Michael,

Thanks for that explanation, it gives me the answers I needed to know.

For most of my jewellery work I can pretty much manage to do all of my modeling within MoI & only move out of it to use Rhino as required.
It's just been those few odd designs that require some form of a texture that have caused me any real grief...
...so by using either a ZSurf4 IGES file or Rhino's "HeightField" to get a NURBS surface, those usually solved the problem.

I think what I did was fall into the trap that having successfully used IGES files before with a texture, that it was going to be a "magic bullet" for anything with texture...
...I can now see why that wasn't ever going to work for me.
As my understanding of all this stuff slowly grows, I'm starting to think I'll need to consider getting T-Splines as part of my workflow.

regards Colin