Function SmoothStep

Source/Engine/Core/Math/Math.h:474–477

Performs smooth (cubic Hermite) interpolation between 0 and 1.

    // Performs smooth (cubic Hermite) interpolation between 0 and 1.
    static float SmoothStep(float amount)
    {
        return amount <= 0 ? 0 : amount >= 1 ? 1 : amount * amount * (3 - 2 * amount);
    }

    // Performs a smooth(er) interpolation between 0 and 1 with 1st and 2nd order derivatives of zero at endpoints.
    static float SmootherStep(float amount)