Amapi 3D supports two different object creation (drawing) modes: polygonal mode and NURBS mode. For more details on those modes, see chapter User Manual/Tools/Construction/Polygonal models or NURBS.
You can switch from one mode to another as follows:
¨ Selecting “NURBS Mode” in the “Edit” menu.
¨ Clicking on the “NURBS” or “POLY” button in the “Menu” area of the Assistant Palette.
¨ Using the hotkeys (on PC: CTRL+B, on Mac: Command+B).