+ Windows 2000/XP/Vista/7
+ Intel/AMD processor ~500MHz or faster
+ 64Mb RAM, 128Mb recommended
+ Approximately 10Mb of free disk space
+ Recommended: OpenGL accelerated graphics card
A very curious thing!
Extrude of something is made by the relative position of a Point / Origine! :)
After Extrusion you can move normally objects' points!