Rotating player (first person controller) to face an object dead-on

Questions & Answers
1

I found about 8 questions related to my question, but none of them solved my problem. I have a modified FirstPersonControl script attached to the typical first person setup, a.k.a. my player object. In my game I have ladders, and my player knows how to climb ladders when triggered to do so. When the player enters climb mode, I want to rotate the player around world.up so that it is facing the ladder head on. I tried all of the relevant posts that I found but none of them gave me the results that I want. I only want to rotate around world up. It’s a seemingly simple task that I just can’t get right. Quaternion.LookRotation causes unwanted tilt to my capsule, and I couldn’t get the code right to only grab the rotation around up, so I tried the below broken code. Can someone please tell me how to do this? Here’s the last incarnation of what I tried:

//--------------------------------------------------------------------------------------------------
//called from ladder script.  In OnCollisionEnter this.gameObject is passed, in OnCollisionExit
//null is passed effectively detaching the ladder.  Multiple ladders can be stacked to reach higher
//grounds
public void AttachLadder ( GameObject ladder )
{
    m_currentRotation = 0f;
    m_ladder = ladder;
    if ( m_ladder )
    {
        ++m_attachCount;
        //going from one ladder to another?
        if ( !m_climbMode )
        {
            m_animationAngle = -50f;
            m_animationSpeed = -cameraTiltAnimationSpeed;
            m_animateCameraTilt = true;
            m_climbMode = true;

            //attempt to rotate the player around the y axis (world up direction) to face the ladder headon
            Vector3 wantedDir = -ladder.transform.forward;
            Vector3 dir = Vector3.Project( ladder.transform.position - m_thisTransform.position, wantedDir );
            dir.Normalize();

            float sign = angleDirection( dir, wantedDir, Vector3.up );
            float angle = Vector3.Angle( dir, wantedDir );
            float camRotation = angle;
            if ( sign == -1f )
            {
                camRotation = 360f - angle;
            }

            m_thisTransform.Rotate ( 0, camRotation, 0, Space.World );

            m_nextDetachTime = Time.time + detachDelay;
        }
    }
    else
    {
        --m_attachCount;
        if ( m_attachCount == 0 )
        {
            m_climbMode = false;
            m_animationAngle = 50f;
            m_animationSpeed = cameraTiltAnimationSpeed;
            m_animateCameraTilt = true;
        }
    }
}
//--------------------------------------------------------------------------------------------------
float angleDirection ( Vector3 fwd, Vector3 targetDir, Vector3 up )
{
    Vector3 perp = Vector3.Cross ( fwd, targetDir );
    float dir = Vector3.Dot ( perp, up );
    if ( dir > 0f )
    {
        return 1f;
    }
    else if ( dir < 0f )
    {
        return -1f;
    }
    else
    {
        return 0f;
    }
}

Thanks.

2

After all that headache it turned out to be as simple as I expected. I was using the forward vector of my ladder prefab, but the prefab was built rotated, so the face that I want to rotate toward is actually -right. So, here is the code that accomplishes the rotation I was looking for:

Quaternion rot = Quaternion.LookRotation( -m_ladder.transform.right );
m_thisTransform.rotation = rot;