Hi ioVideoMaker, I'd say that the root of your problem is trying to do too much all in one single loft.

Loft is primarily a surfacing tool. You basically want to use it to generate one sheet that has a single shape to it.

In your model you've got a lot of tight bends in your profile curves - those are places where there should be a transition in between different surfaces, usually that is done by having pieces meet at a sharp edge initially and then apply a fillet for the transition piece.

It's difficult to get a good quality surface when you're incorporating a whole bunch of these transition areas right in a single go of Loft.

So a kind of better direction would be to have fewer profiles and generate an initial shape that has sharp edges maybe ignore the very top part to start with and get the main body part set up with a cleaner simpler structure.

Your current one has so many profiles with so many different shapes trying to connect together into a single surface that it becomes stressed and has bunching and buckling in it rather than relaxed and simpler surfaces.

- Michael

So something more like this, here fewer sections and using "Straight sections" loft mode to make the base form:



Then the transitions come from doing a Fillet:



- Michael

And for the top probably extend up the main blocky body and then have a separate dome surface that intersects it with a boolean, something like:







- Michael

Hey io,
If you do the surface grooving first, before all the detailing will help. MoI has an "Inset" Command which has groove options.

THANKS for taking the time to try it!
I'll surely consider your suggestion for next model, 'cause right now I'm in the rigging/animation phase, and (as usual) every problem I just had 5 days ago seems to magically disappear... (everything works, as soon as you don't need it...)

I know I should invest some time in uderstanding good topology, but I just need the quickest way to visualize various options for a prototype and "loft" or "sweep" are just my actual way to go... ..but sometimes I get stuck with these weird (for me) problems...

thanks again, and I'll come back with some useful insight (if I find any)

best regards and happy new year! (to everybody, in the MOI3D community)

:-)