particle system crash

[tm]

I tried to add a particle system when a button is pressed.Declared globally
IParticlesystem scenenode and IParticlesystemEmitter. and inside the event system of the gui button i have added the code for the particle system.while running if i press the button,the programmcrashes.Debugger says access violation in line myps->addParticleSystemSceneNode(false);. Otherwise if I make the particles from outside the event in main it works fine.Help please.

[Saalen]

It's a pointer messed up. Please post more code.

[tm]

yes..i have initialized the emitter global pointer em=0; and particle system*ps=0; But how do we initialize a variable* globally and update it so that it is available to any other function. Should we update it with a function inside the final draw loop?
i am not near the computer in which i wrote the code. I will get it from workplace and post tomorrow.
Thank you for helping

[Yokom]

It's a pointer messed up. Please post more code.

scene::IParticleSystemSceneNode* EngPartNode = 0;
EngPartNode = smgr->addParticleSystemSceneNode(false); /*, // defaulte point emmiter
0, // parent
-1, // id
vector3df(1,1,1), // position
vector3df(0,0,0), // rotation
vector3df(1,1,1) // scale
); */
EngPartNode->setPosition(core::vector3df(0,0,0));
EngPartNode->setScale(core::vector3df(1,1,1));

EngPartNode->setParticleSize(core::dimension2d<f32>(10.0f,10.0f));

That is the way im setting up the particle code. I first was just commenting each part of the command to add the node, just so I could get my head wrapped around why it was crashing. Then I took out all the prams and defined the stuff i needed with set commands it still bombs. I have a disassemble of the code that my compiler debug gives you let me post it also and see if we can nail why this is crashing.

EngPartNode = smgr->addParticleSystemSceneNode(false); /*, // defaulte point emmiter
00426438 push 3F800000h
0042643D push 3F800000h
00426442 push 3F800000h
00426447 lea ecx,[ebp-190h]
0042644D call irr::core::vector3d<float>::vector3d<float> (4230B9h)
00426452 mov esi,esp
00426454 push eax
00426455 push 0
00426457 push 0
00426459 push 0
0042645B lea ecx,[ebp-17Ch]
00426461 call irr::core::vector3d<float>::vector3d<float> (4230B9h)
00426466 push eax
00426467 push 0
00426469 push 0
0042646B push 0
0042646D lea ecx,[ebp-168h]
00426473 call irr::core::vector3d<float>::vector3d<float> (4230B9h)
00426478 push eax
00426479 push 0FFFFFFFFh
0042647B push 0
0042647D push 0
0042647F mov eax,dword ptr [this]
00426482 mov ecx,dword ptr [eax+558h]
00426488 mov edx,dword ptr [this]
0042648B mov eax,dword ptr [edx+558h]
00426491 mov edx,dword ptr [ecx]

00426493 mov ecx,eax
00426495 call dword ptr [edx+40h]
00426498 cmp esi,esp
0042649A call @ILT+3860(__RTC_CheckEsp) (423F19h)
0042649F mov dword ptr [EngPartNode],eax
0, // parent
-1, // id
vector3df(1,1,1), // position
vector3df(0,0,0), // rotation
vector3df(1,1,1) // scale
); */
EngPartNode->setPosition(core::vector3df(0,0,0));

the pointer where the error is marking 426491 i put it in red and the debug is telling me that ecx is 0.

So ya if thats a pointer it makes sense to crash. But what pointer is it and where should we have defined it.

scene::IParticleSystemSceneNode* EngPartNode = 0; Should have created the pointer. So im really confused. Ill keep working on it.

[Spintz]

scene::IParticleSystemSceneNode* EngPartNode = 0;
EngPartNode = smgr->addParticleSystemSceneNode(false);

That code works fine for me. Are you sure the sceneManager is initialized before calling this? Check the smgr pointer to be sure it's valid?

[Yokom]

scene::IParticleSystemSceneNode* EngPartNode = 0;
EngPartNode = smgr->addParticleSystemSceneNode(false);

That code works fine for me. Are you sure the sceneManager is initialized before calling this? Check the smgr pointer to be sure it's valid?

The compiler would throw me an error if smgr wasnt valid right. I think i have a conflict with the newton enging over the "this" varible in the assemble level.

[Spintz]

No, the compiler wouldn't throw an error if smgr was not initialized. As long as the smgr pointer is declared ( i.e. ISceneManager* smgr; ) the compiler knows no difference. Actually, if a pointer is NULL or no longer valid, the run-time behavior is undefined.

[Yokom]

No, the compiler wouldn't throw an error if smgr was not initialized. As long as the smgr pointer is declared ( i.e. ISceneManager* smgr; ) the compiler knows no difference. Actually, if a pointer is NULL or no longer valid, the run-time behavior is undefined.

Yep right on the money. My little project has almost 12 classes now and i was in one that arrives before the smgr is declared. So the pointer was not there and thus crash.

Thanks.