[iPhone] accidental lag

[Falcco]

Hi all,

I tried simple demo based on Ogre for iphone. And I found problem with small accidental lag. I tried everything and I really didnt know what I have to do, so I tried to make whole app where is only 50 cubes (7 on screen in the moment) and one movable cube. This cube is moved by:

Code: Select all

	

update()
{
        if(m_fakeDir == 0 && m_CubeNode->getPosition().x < 400) {		
		m_CubeNode->translate(Ogre::Vector3(0.6f, 0.0f, 0.0f));
	} else {
		m_fakeDir = 1;
	}
	
	if(m_fakeDir == 1 && m_CubeNode->getPosition().x > 0) {
		m_CubeNode->translate(Ogre::Vector3(-0.6f, 0.0f, 0.0f));
	} else {
		m_fakeDir = 0;
	}
	
	
	m_Camera()->setPosition(Ogre::Vector3(m_CubeNode->getPosition().x + 0,
													m_CubeNode->getPosition().y + 60,
													m_CubeNode->getPosition().z + 43));
	
	m_Camera()->lookAt(m_pCubeNode->getPosition());
}

in init method entities and nodes are created:

Code: Select all

init()
{
	m_EntitiesCnt = 0;
	m_CubeEntity = OgreFramework::getSingletonPtr()->mSceneMgr->createEntity("Cube1234" + Ogre::StringConverter::toString(m_EntitiesCnt), "Cube.mesh");
	m_CubeNode = OgreFramework::getSingletonPtr()->mSceneMgr->getRootSceneNode()->createChildSceneNode("CubeNode1234" + Ogre::StringConverter::toString(m_EntitiesCnt));
	m_CubeNode->attachObject(m_CubeEntity);
	m_EntitiesCnt++;
	
	m_CubeNode->setPosition(Ogre::Vector3(0,0,-3));
	
	int posx = 0;
	int posz = 0;
	
	for(int i = 0; i < 50 ; i++) {

		Ogre::Entity* entity;
		Ogre::SceneNode* node;
		
		entity = OgreFramework::getSingletonPtr()->mSceneMgr->createEntity("Cube" + Ogre::StringConverter::toString(m_EntitiesCnt), "Cube.mesh");
		node = OgreFramework::getSingletonPtr()->mSceneMgr->getRootSceneNode()->createChildSceneNode("CubeNode" + Ogre::StringConverter::toString(m_EntitiesCnt));
		node->attachObject(entity);
		m_EntitiesCnt++;
		node->setPosition(Ogre::Vector3(posx, 0, posz));
		posx += 10;				  
	}

	m_fakeDir = 0;

App runs more than 40FPS but sometimes accidental lag appears.
Is there somebody who had this same problem or can somebody try that situation and tell me about result of this small test? Because I dont know if it is problem of my app or not.

thnx.

[masterfalcon]

What do you mean by "accidental lag"?

[Falcco]

There are situations when FPS come down from 40 to 30 with no reason. It is once or twice in a minute (of course only on device - i tried ipod and iphone 3gs and iphone 4 everywhere this same result)

[masterfalcon]

Have you tried running through Instruments to see what's going on when the spikes occur?

[Falcco]

I`m not able to make test with intruments because it is slower. But I tested it on iPod and it is happening only if the app is started on device (without xcode, without cable). App was started thru xcode (device on the cable) and everything was fine.

btw: is there some limit for SceneNode-s on the scene?