Pour ma part j'utilise cette methode :

irr::core::matrix4 Mat;

    if (m_Nmodele != 0 && m_isMoving == true)
    {
        //On commence par recuperer la position actuelle
        core::vector3df v = m_Nmodele->getPosition();
        core::vector3df r = m_Nmodele->getRotation();

        if (myKeyPressed=="Z")
        {
            //On y ajoute la valeur de deplacement

            Mat.setRotationDegrees(m_Nmodele->getRotation());
            core::vector3df Target(0.2,0,0);
            Mat.transformVect(Target);
            core::vector3df NewPos=m_Nmodele->getPosition();
            NewPos += Target;
            m_Nmodele->setPosition(NewPos);



        }
        else if (myKeyPressed=="S")
        {
           
            Mat.setRotationDegrees(m_Nmodele->getRotation());
            core::vector3df Target(-0.2,0,0);
            Mat.transformVect(Target);
            core::vector3df NewPos=m_Nmodele->getPosition();
            NewPos += Target;
            m_Nmodele->setPosition(NewPos);
        }
        if (myKeyPressed=="Q")
        {
            r.Y-= 0.1;
            m_Nmodele->setRotation(r);
            
        }
        else if (myKeyPressed=="D")
        {

            r.Y+= 0.1;
            m_Nmodele->setRotation(r);


        }
    }