Hi Martin,

> Am I asking too much from Moi by sweeping a circle
> around 1000 turns?

Actually yes - by the standards of NURBS modeling which creates a truly curved surface, that kind of 1000 turn tube is extremely complex.

One thing you can do though with such complex surfaces is to change the display density to be rougher - see this previous post on the settings to adjust:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4558.4

The default settings for MoI generate a pretty high density display mesh, which for simple models makes the model look really nice but for a really high complexity tightly curved surface like you're trying to create the default settings will generate a quite high density display mesh.

The kind of complex single surface that you're trying to create in this case is kind of unusual in NURBS modeling - if you're trying to do something like that as a render effect you probably want to do that in a rendering program which may have some method of generating a pretty low polygon result along that curve instead of the kind of highly accurate result that NURBS modeling is focused on.

Basically when you are building NURBS models, the system is tuned towards high accuracy in all operations - the surface that you are generating there is refined until it is within 0.001 units of the ideal result. That kind of accuracy helps a lot for making precise and manufacturable models, but in a case like this it also creates a result with heavy data in it.

What kind of end result model are you trying to build that has a 1000 turn coil like that in it?

It is possible that MoI is not the right tool for the particular job that you're trying to do - if you want something that has a 1000 turn coil in it and you don't care about the actual accuracy of it a polygon modeling tool is probably a better tool for that case.

If you adjust the display density it may help some, but that particular sweep example is a pretty unusual case, in more regular types of sweeps you shouldn't see such a long delay.

- Michael