public static HSBColor Lerp(HSBColor a, HSBColor b, float t)
        {
            float h, s;

            //check special case black (color.b==0): interpolate neither hue nor saturation!
            //check special case grey (color.s==0): don't interpolate hue!
            if (a.brightness == 0)
            {
                h = b.hue;
                s = b.saturation;
            }
            else if (b.brightness == 0)
            {
                h = a.hue;
                s = a.saturation;
            }
            else
            {
                if (a.saturation == 0)
                {
                    h = b.hue;
                }
                else if (b.saturation == 0)
                {
                    h = a.hue;
                }
                else
                {
                    // works around bug with LerpAngle
                    float angle = Mathf.LerpAngle(a.hue * 360f, b.hue * 360f, t);
                    while (angle < 0f)
                    {
                        angle += 360f;
                    }
                    while (angle > 360f)
                    {
                        angle -= 360f;
                    }
                    h = angle / 360f;
                }
                s = Mathf.Lerp(a.saturation, b.saturation, t);
            }
            return(new HSBColor(h, s, Mathf.Lerp(a.brightness, b.brightness, t), Mathf.Lerp(a.alpha, b.alpha, t)));
        }