M:	Show/Hide Menu
S:	Save .obj
Mouse wheel / drag:	Scale / Pan
Enter:	Reset Scale / Pan
N:	[1;500]
A:
Gap:
Back-Col:
Line-Col:
Alpha:
	Set params
Tiling:	square polar hexa james_t10 cairo einstein hat
F(x,y): Javascript	Set F(x,y)
Presets:	z*z z^p z+1/z inversion z rational identity