There are 2 nesting algoritms included in the program. The first is a regular rectangular algoritm that is fast. It uses the bounding box of each object to place objects. The second is a more advanced irregular shape algoritm. This algoritm determines how irregular shaped parts are best positioned together to minimize the total area. You can give in how many rotations per part should be tried. More rotations means equally more computation time. After nesting you might want to fine tune the position of your parts. You can do this very handy from the top view with the arrow keys (see keyboard shortcuts) or of course with the object manipulator.