以前のリビジョンの文書です —-

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093 Quaternionによる任意軸回転

概要

Quaternionとは、XYZで軸を決めてWで捻る（ひねる）代物。

private Quaternion  m_qBaseQuat; 
private GameObject  m_Target; 
 
void Start() 
{ 
	m_qBaseQuat = gameObject.transform.rotation; 
} 
 
 
void OnUpdate() 
{ 
    if (m_Target != null) 
    { 
        Vector3 axisY = new Vector3(0, 1, 0); 
        Vector3 dir = (m_Target.gameObject.transform.position - transform.position).normalized; 
        float fRotY = Mathf.Atan2(-dir.y, dir.x); 
        transform.rotation = m_qBaseQuat * Quaternion.AngleAxis( (fRotY * Mathf.Rad2Deg), axisY); 
    } 
}

例えばこれだと、m_qBaseQuatに起動時のQuaternionを保存しておいて、m_qBaseQuatから相対的にm_Target(標的)の向かって捻ることになる。
キャラを振り向かせたり、2Dのミニマップとかで表示する矢印とかに使える。

stepism@UE4メモ

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093 Quaternionによる任意軸回転

概要

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