[codygo]

Here's an excellent tutorial, but I think you have to register to view it.
http://aliasdesign.autodesk.com/learnin ... 02_133094/

[deadalvs]

no registering needed.

i have seen the whole tutorial with all vids on youtube.

* * *

which brings me back to my main question.

how to model partlines. how are they done easiest ?

[codygo]

In studio you either project the partlines drawn in an isometric view onto surfaces, then use features that offset that curve and use those curves to trim the partline. After that there are features you can use to draft surfaces perpendicular to the parent surface with filleted transition.

There are other techniques for projection including the use of either "blend curves" which can be set to a particular continuity right on the surface, followed by a normal based projection to surface, or using curve on surface directly and then following the previous steps for creating partline surfaces.

Without studio, you can follow the same steps, and use a feature like pipe followed by intersect to create offset curves on the surfaces, then trim. You can offset the new trimmed surface by a given amount and loft between them to get the drafted surface, then delete the un-needed surface, and fillet the transition. If the angles on the body surfaces aren't too drastic you can sometimes offset the curves you're using in isometric view, then directly extrude into surfaces to intersect with the body surfaces, and trim away the excess, which will result in much cleaner partline surfaces with less trouble filleting.