Qt irrlicht（鬼火）3D引擎 摄像机旋转问题

if (m_device != 0 ) { core::vector3df rotation(y,x,0.f); m_camera->setRotation(rotation); f32 viewlength = m_camera->getTarget().getLength(); f32 angle = z*2*Pi/360.0; m_camera->setUpVector(vector3df(viewlength*cos(angle),viewlength*sin(angle),0.0f)); }

void Scene_3D::slotUSBENGINE(f32 x, f32 y, f32 z)
{
    core::vector3df pos = m_camera->getPosition();
    core::vector3df target = (m_camera->getTarget() - m_camera->getAbsolutePosition());
    core::vector3df relativeRotation = target.getHorizontalAngle();
    target.set(0,0, core::max_(1.f, pos.getLength()));
    core::vector3df movedir = target;
    core::matrix4 mat;
    mat.setRotationDegrees(core::vector3df(relativeRotation.X, relativeRotation.Y, 0));
    mat.transformVect(target);
    movedir = target;
    movedir.normalize();
    pos += movedir*0.5f*(x/5);
    core::vector3df strafevect = target;
    strafevect = strafevect.crossProduct(m_camera->getUpVector());
    m_camera->setPosition(pos);
    target += pos;
    m_camera->setTarget(target);
    //    qDebug()<<"hjsdfjhkgsdfgjhksdfajhgksadfjhklsdfahjklsdfakhjlsakjhlsdfhkjsdfajhklsafkjhlsfajhklsfdahjklfsdahjklfsdahjklsfjkhlsd";
}