Method FromDirection

Source/Engine/Core/Math/Quaternion.cpp:315–335

}

Quaternion Quaternion::FromDirection(const Float3& direction)
{
    CHECK_RETURN_DEBUG(direction.IsNormalized(), Quaternion::Identity);
    Quaternion orientation;
    if (Float3::Dot(direction, Float3::Up) >= 0.999f)
    {
        RotationAxis(Float3::Left, PI_OVER_2, orientation);
    }
    else if (Float3::Dot(direction, Float3::Down) >= 0.999f)
    {
        RotationAxis(Float3::Right, PI_OVER_2, orientation);
    }
    else
    {
        Float3 right, up;
        Float3::Cross(direction, Float3::Up, right);
        Float3::Cross(right, direction, up);
        LookRotation(direction, up, orientation);
    }
    return orientation;
}

void Quaternion::LookRotation(const Float3& forward, const Float3& up, Quaternion& result)
{