Quaternion nNewRotation = Quaternion.Euler(_CameraDefaultPos.y, _Orbit_CurrentYaw, 0);

    Vector3 vCurHero = new Vector3(_HeroPos.x, _HeroPos.y, _HeroPos.z);
    Vector3 negDistance = new Vector3(_CameraDefaultPos.x, fUpDownPosition, _CameraDefaultPos.z); //fUpDownPosition was calculated from "Mouse Y" earlier

    Vector3 nNewPosition = nNewRotation * negDistance + vCurHero;
    Vector3 nNewRotationVector = new Vector3(_Orbit_CurrentPitch, nNewRotation.eulerAngles.y, nNewRotation.eulerAngles.z);

    nNewRotation = Quaternion.Euler(nNewRotationVector);

    _camera.transform.localRotation = nNewRotation;
    _camera.transform.localPosition = nNewPosition;

Vector3 vCurHero = new Vector3(_HeroPos.x, _HeroPos.y, _HeroPos.z + (_CameraDefaultPos.z - _camera.transform.localPosition.z));
    Vector3 negDistance = new Vector3(_CameraDefaultPos.x, fUpDownPosition, _CameraDefaultPos.z);