> Good tip btw with Modo and Inventor.
> I always thought, that Polymodels could not be converted into nurbs. Only vise versa.

This used to be true, it's only fairly recently that there are some tools for going in the sub-d to NURBS direction.


> Therefore: If I already have the main body of the car (like in my file) how do I make the bottom of the car as
> one surface so it fits exactly to the wheel arches?

The part that goes up to the wheel arches would be separate surfaces, it's all the coplanar or nearly coplanar fragments all along the very bottom that you'd want to have as one big surface. The basic thing is instead of drawing in every single boundary edge of your object to start with, you want several of the boundaries in your final 3D shapes to be generated as the result of booleans or trims between pieces rather than manually drawn...

Car modeling though is a particularly difficult area and there are areas in it that will force you away from the primarily boolean-driven method that is really where NURBS modeling is strongest in and easier to use.

- Michael