def lerp(start, end, alpha):
    """
    Computes a linear interpolation between two values
    :param start: start value to interpolate from
    :param end:  end value to interpolate to
    :param alpha: how far we want to interpolate (0=start, 1=end)
    :return: float, result of the linear interpolation
    """
    return start + alpha * (end - start)
