private void CreateAnimation(float toValue)
        {
            float fromValue = skin.GetBlendShapeWeight(BLEND_DILATE_IDX);

            if (currentAnimation != null)
            {
                currentAnimation.Abort();
            }
            currentAnimation = new BlendShapeAnimation(skin, BLEND_DILATE_IDX, fromValue, toValue, dilateDuration, Ease.Cubic.Out);
            currentAnimation.Play();
        }