Just for those who'd like to learn from this:

c_setminmax(me);

has to be replaced by

c_updatehull(me,1);

Only this anews the collision of the polygons.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt