Animations of windmills is a good place to start. The wings are all constructed from a single point which is controlled by an angle slider. [br][br]The construction consists of: [br][list][*]a slider [math]\alpha[/math].[/*][*]an "Angle with Given Size" set to [math]\alpha[/math].[/*][*]2 more points made as "Angle with Given Size" (120[math]^\circ[/math]).[br][/*][*]a slider to control the speed of the animation.[/*][*]In the first mill - 3 segments as wings.[/*][*]Below - 4 triangles as graphic.[br][/*][/list]

Herunder en, der har udskiftet foden med et billede af en mølle.