scene node created in class MyEventReceiver not displayed!

[pat-rizio]

Hi everybody,
this is my problem:
I inizialize scenemanager, driver and device in main method as follow:

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	device = createDevice(video::EDT_OPENGL, core::dimension2d<s32>(800, 600),16, false, false, false);
	driver = device->getVideoDriver();
	smgr = device->getSceneManager();
	MyEventReceiver receiver;
	
	device->setEventReceiver(&receiver);

Then I want to create (add to scenemanager) a node when I press "4" key on my keyboard. To do this I followed tutorials, and I create the class MyEventReceiver as follow:

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class MyEventReceiver : public IEventReceiver
{
public:
	virtual bool OnEvent(SEvent event)
	{
		if (node != 0 && event.EventType == irr::EET_KEY_INPUT_EVENT&&
			!event.KeyInput.PressedDown)
		{
			switch(event.KeyInput.Key)
			{
			case KEY_KEY_4:
				{
					miamano = new Hand(smgr,"F:/GCT/Progetto/HandModel",false);
					break;
				}
			case KEY_KEY_5:
				{
					if (miamano != NULL)
					{
					delete miamano;
					miamano = NULL;
					}
					break;
				}
			case KEY_KEY_6:
				{
					miamano->setVisibile(!miamano->isVisible());
					break;
				}
			return true;
			}
		}

		return false;
	}

};

where "miamano" is an istance of my class called "Hand". Pressing "4" class constructor is called, pressing "6" miamano should be visualized.

The Hand's costructor is:

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	{
		//Check if model directory is right terminated
		if (ModelDir.size() != 0)
		{
			c8 last = ModelDir[ModelDir.size()-1];
			if (last != SLASH) ModelDir.append(SLASH);
		}
		try
		{
		//Building Hand Model
		//ROOT
			V2Grp01 = smgr->addEmptySceneNode();
			V2Grp01->setName(L"V2Grp01");
			V2Grp01->setVisible(this->startVisible);
			scene::ISceneNode* dad_GROUND01 = smgr->addEmptySceneNode();
			dad_GROUND01->setName(L"dad_GROUND01");
			scene::ISceneNode* GROUND01 = smgr->addEmptySceneNode();
			GROUND01->setName(L"GROUND01");
			dad_Palm01 = smgr->addEmptySceneNode();
			dad_Palm01->setName(L"dad_Palm01");
			scene::ISceneNode* Palm01 = smgr->addEmptySceneNode();
			Palm01->setName(L"Palm01");
		//PALM
			scene::ISceneNode* dad_Palm02 = smgr->addEmptySceneNode();
			dad_Palm02->setName(L"dad_Palm02");
			scene::ISceneNode* VIFS16 = smgr->addOctTreeSceneNode( smgr->getMesh((ModelDir + "VIFS16.3ds").c_str())->getMesh(0,255));
			VIFS16->setName(L"VIFS16");
..........

now the problem is that my object "miamano" has been displayed ONLY if in main method I create a useless TestSceneNode or EmptySceneNode as follow:

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node = smgr->addTestSceneNode();

or

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node = smgr->addEmptySceneNode();

can anyone explain me why it happens?

[hybrid]

How does your event receiver know which Scene Manager to use? You did not set it anywhere inside the event receiver, nor in any other code. And how does your main loop look like?

[pat-rizio]

sorry, I forgot to write that smgr is a global variable, so myEventReceiver can access to it and pass it to Hand's constructor as shown in my code:

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miamano = new Hand(smgr,"F:/GCT/Progetto/HandModel",false);

My complete main is:

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int main(int argc, int argv[])
{
	device = createDevice(video::EDT_OPENGL, core::dimension2d<s32>(800, 600),16, false, false, false);
	driver = device->getVideoDriver();
	smgr = device->getSceneManager();
	MyEventReceiver receiver;
	
	device->setEventReceiver(&receiver);

	//LUCE
	smgr->addLightSceneNode(0, core::vector3df(1,1,11), video::SColorf(1.0f,0.6f,0.6f,1.0f),	1.0f);
    
	node = smgr->addEmptySceneNode();
	//node = smgr->addTestSceneNode();

	scene::ICameraSceneNode* camera = smgr->addCameraSceneNodeFPS(0, 30.0f, 10.0f);
	camera->setPosition(core::vector3df(0,5,0));
	device->getCursorControl()->setVisible(false);

	int lastFPS = -1;

	while(device->run())
	{
		driver->beginScene(true, true, video::SColor(255,113,113,133));
		smgr->drawAll();
		driver->endScene();


	}

device->drop();
	
	return 0;
}

[hybrid]

Sorry, no clues. But your grouping and visibility won't work this way. You only set visibility for one empty node, but this node does not become the parent of the others. Anyway, this won't help with your problem.

[pat-rizio]

well, parent relationships are managed in another part of my code, and it works if I ignore the problem I post here...

My problem should be a bug problem?

[vitek]

It sounds like you are not setting a world transform in your Hand::render method. You are not the only one... http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=11582

One more thing. You should never delete a scene node directly. It can, and will, cause crashes in your program. Use this instead...

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  miamano->remove(); // remove from parent
  miamano->drop(); // remove our reference, will delete object
  miamano = NULL;

Travis

[pat-rizio]

first of all sorry for my late reply.

@vitek: on this topic, what is

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matrix()

as the second argument of setTransform method you suggest to use? At what i have to set it?

[vitek]

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driver->setTransform(ETS_WORLD, matrix()); 

The call matrix() should have been matrix4(). It is an explicit call to the matrix4 constructor. The default constructor for matrix4 creates an identity matrix. We then pass the identity matrix to setTransform. It is equivalent to doing this...

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matrix4 mat;
mat.makeIdentity();

driver->setTransform(ETS_WORLD, mat);

You probably don't want to use an identity matrix, I just used it as an example.

[pat-rizio]

ok thanks for your explanation, but nothing change
which matrix should "mat" be?
it doesn't matter which matrix is, I have only to call it and set to identity or is it a particular transformation matrix of my virtual word?

[vitek]

I'd be willing to bet that the test scene node works just fine, but your scene node does not. Right? Well if this is true, why not just have a look at the code in CTestSceneNode.cpp.

Travis

[pat-rizio]

you win your bet...
If nobody has any idea to solve my problem then I will have a look at the code in CTestSceneNode.cpp...

[r3i]

Maybe your problem is similar to me. I've a collision test in my event receiver and if some elements are pointed some nodes must change their texture: my code works correctly only WITH ONE NODE in the smgr.

http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=11881

Take the Hello World example and put the code for create Sidney after smgr->drawAll() recompile and you know the problem: sometimes you have nothing...

maybe womething goes wrong

[pat-rizio]

Yes I think we have the same problem.

Maybe is it a bug inside IEventReceiver class?

[r3i]

It can be also a logic problem in programming: I'm trying to make some tests: if I discover something i'll tell you.