Quaternion from two Vector3

Unity Engine
1

Hi, everybody. For a start here such screenshot.

2180686--144499--NonName.png
2180686--144499--NonName.png727×350 20.1 KB

At the left - result of LookAt and LookRotation.
On the right - result necessary to me.
Initially the cube costs parallel to the camera.

I should make so that the object not simply looked at the second vector, but also calculated turn. (if to watch a screen) on axis X.
As a result the algorithm shall look approximately so:

2180686--144500--NonName2.png
2180686--144500--NonName2.png828×584 33.6 KB

However seemingly suitable function Quaternion.FromToRotation() doesn’t give out result…

for (int p = 0, f = 0; f < frequency; f++) {
            for (int i = 0; i < items.Length; i++, p++) {
                Transform item = Instantiate(items[i]) as Transform;
                Vector3 position = spline.GetPoint(p * stepSize);
                item.transform.localPosition = position;
                if (lookForward) {
                    Quaternion rot = Quaternion.FromToRotation (Vector3.forward, (spline.GetDirection((p+1) * stepSize)));
                    item.transform.rotation = rot;
                }
                item.transform.parent = transform;
            }
        }

P.S.: To calculate local turn from transforms not option. Where I need this function transforms have no turn.

2

@Timofffee the images didn’t come through… you don’t need to take images of code, just paste it in using [ code] [/ code] tags (sticky on them at the top of the scripting forum)

3

@LeftyRighty I corrected, but from it there isn’t enough sense.