fletcher.paths.cubic-second-derivative()

Get the second derivative (d²x/dt²) of a cubic bezier at position t.

• a (vector): Start point
• b (vector): End point
• c1 (vector): Control point 1
• c2 (vector): Control point 2
• t (float): Position on curve [0, 1]

fletcher.paths.cubic-second-derivative(
  a,
  b,
  c1,
  c2,
  t,
) -> vector