Move and rotate SceneNode(Sphere) in Irrlicht

Question

I am trying to animate a 3D sphere in Irrlicht with WASD. The moving part works properly, but the rotation does not work. As long as I press only W / S or A / D it works. If I mix them up or start from a different point, the rotation spins.

Declaration

scene::ISceneNode* ballSceneNode = sceneManager->addSphereSceneNode(5);
if (ballSceneNode) {
    ballSceneNode->setPosition(core::vector3df(0, 0, 100));
    ballSceneNode->setMaterialTexture(0, driver->getTexture("media/ball.bmp"));
    ballSceneNode->setMaterialFlag(video::EMF_LIGHTING, false);
}

Main Loop

core::vector3df ballRotation = ballSceneNode->getRotation();
core::vector3df ballRotation = ballSceneNode->getPosition();

if(receiver.isKeyDown(irr::KEY_KEY_W)) {
    ballPosition.Z += movement;
    ballRotation.X++;
} else if(receiver.isKeyDown(irr::KEY_KEY_S)) {
    ballPosition.Z -= movement;
    ballRotation.X--;
}

if(receiver.isKeyDown(irr::KEY_KEY_A)) {
    ballPosition.X -= movement;
    ballRotation.Z++;
} else if(receiver.isKeyDown(irr::KEY_KEY_D)) {
    ballPosition.X += movement;
    ballRotation.Z--;
}

ballSceneNode->setPosition(ballPosition);
ballSceneNode->setRotation(ballRotation);

I have read about that you need core::matrix4 for rotation or better to say that it would be helpful / easier and maybe also correct, but I do not know how to use it.

EDIT

if(receiver.isKeyDown(irr::KEY_KEY_W)) {
    ballPosition.Z += movement;
    cameraPosition.Z += movement;

    core::quaternion test;
    test.fromAngleAxis(xAxisAngle, core::vector3df(1,0,0));
    xAxisAngle += 0.1f;
    test.normalize();
    core::vector3df rot;
    test.toEuler(rot);
    ballSceneNode->setRotation(rot * core::RADTODEG);
} else if(receiver.isKeyDown(irr::KEY_KEY_S)) {
    ballPosition.Z -= movement;
    cameraPosition.Z -= movement;

    core::quaternion test;
    test.fromAngleAxis(xAxisAngle, core::vector3df(1,0,0));
    xAxisAngle -= 0.1f;
    test.normalize();
    core::vector3df rot;
    test.toEuler(rot);
    ballSceneNode->setRotation(rot * core::RADTODEG);
}

if(receiver.isKeyDown(irr::KEY_KEY_A)) {
    ballPosition.X -= movement;
    cameraPosition.X -= movement;

    core::quaternion test;
    test.fromAngleAxis(zAxisAngle, core::vector3df(0,0,1));
    zAxisAngle += 0.1f;
    test.normalize();
    core::vector3df rot;
    test.toEuler(rot);
    ballSceneNode->setRotation(rot * core::RADTODEG);
} else if(receiver.isKeyDown(irr::KEY_KEY_D)) {
    ballPosition.X += movement;
    cameraPosition.X += movement;

    core::quaternion test;
    test.fromAngleAxis(zAxisAngle, core::vector3df(0,0,1));
    zAxisAngle -= 0.1f;
    test.normalize();
    core::vector3df rot;
    test.toEuler(rot);
    ballSceneNode->setRotation(rot * core::RADTODEG);
}

xAxisAngle and zAxisAngle are just f32 with default value 0.

Now the problem is: W W D (jumping to original state and loosing the 2 W's)

Answer 1

Mixing rotations using euler angles is always strange because the order in which you apply the rotations matters. Look into using quaternions or building a rotation matrix from an orthogonal basis. There's lots of information on doing these tasks on the Internet and in graphics related textbooks.