- https://docs.godotengine.org/en/stable/tutorials/math/beziers_and_curves.html
- https://spencermortensen.com/articles/bezier-circle/
P0=(0,1),P1=(c,1),P2=(1,c),P3=(1,0) P0=(1,0),P1=(1,−c),P2=(c,−1),P3=(0,−1) P0=(0,−1),P1=(−c,−1),P2=(−1,−c),P3=(−1,0) P0=(−1,0),P1=(−1,c),P2=(−c,1),P3=(0,1) with c=0.551915024494
Point0 = P0 Control0 = P1-P0 Control1 = P3-P2 Point1 = P3