M:	Show/Hide Menu
I:	Toggle projection
O:	Obj
C:	Colscheme
Mouse wheel / drag:	Scale / Rotate
Divisions:	u: v: [2;512]
	Set Params
F(u,v):
	Set F(u,v)
Presets:	Shell Shell 2 Torus Clifford Möbius Astroid Dini Helicoid base Conic spiral Henneberg Spiral 2D spiral Umbrella f(x,y)