Hi Stefan, yeah it's generally difficult to get a high level of smoothness with NURBS when building things in separate patches like this. Usually you have to do a blend or fillet to make a smooth connection, just constructing things adjacent to one another they won't be smooth. That's pretty different than sub-d modeling, where everything that's connected together in the sub-d control cage will get smoothed out.

Your model is fairly close to being smooth, you can more easily see the small creases between patches if you export to a pretty high density polygon mesh and turn on some reflective lighting (called "metallic lighting" in MoI under Options > View > Lighting options):



You could probably improve the smoothness of the model in those areas though by cutting away a little bit of area and then putting in blends, same technique like Andrei shows in the video above in this same thread.

But really both branching and smoothing at the same time just tends to fit a sub-d modeling toolset better.

- Michael