Memory problem with NX_ogre

Well, after coming trough a lot of problems setuping NxOgre in VC++2005, wich I've been all able to solve by searching the forums or by trying different things, I've now come across one wich I'm quite clueless about, here it is.

when I start rendering (using the root, startRendering function) I get this error : Exception non gérée à 0x021261c4 (NxOgre_d.dll) dans TennisVR.exe : 0xC0000005: Violation d'accès lors de la lecture de l'emplacement 0x00000000. Well rough traduction :
Unhandled error at 0x021261c4 (NxOgre_d.dll) in TennisVR.exe : 0xC0000005: Reading violation at 0x00000000.

So I've tried to trace back the error, but the deepest that I could go in the code is :

template <typename _A>
BETAJAEN_CC_INLINE void Each(void (Type::*MethodPtr)(_A), _A _1) {

if (_Flat->_size() == 0)
return;

for(Iterator begin = _Flat->First; begin != _Flat->Last; ++begin) {
(*begin->*MethodPtr)(_1);
}

}
wich bug in the for loop, I assume for now that the code is ok since, well it's a tutorial, I think it's rather comming from the config, or compiler or linker setting, would any one have an idea about this?

thank you in advance

Maybe you use different versions of .lib / .dll / .h ?
Have you ever used / compiled another NxOgre version than you're using now ? Double check the lib directories.

well .. I've checked that out, and .. well there was some confusion amongst theses files.. yes.. but I still have got something else, (or it's the same thing just that I can see clearer where it fail since I use the debug version of the dll, dunno.. )

well it fail the same way (not same adresses) but I can see that it block at:

void RenderableSource::render_Absolute(const TimeStep& ts) {
mRenderPose = getSourcePose(ts);
--> mRenderable->setPose(mRenderPose);
}

in nxogrerenderablesource.cpp

and it seems like mRenderable isn't defined or, well there's no specified renderer in it (well ... like "", empty string). but if I remove the NXOGRE thing and only keep the ogre parts from the tutorial, it don't fail.. and well it use to fail like that (before I fixed it) when setting the Ogre rendersystem.

thanks in advance!!


I'm going to ad something wich might help ...

here is the NxOgre Code,

mWorld = new NxOgre::World("time-controller: ogre");
NxOgre::Scene* mScene = mWorld->createScene("Paris", pSceneManager, "gravity: yes, floor: yes");

NxOgre::Body* mBody = mScene->createBody("OgreHead.mesh", new NxOgre::Cube(0.5f), Ogre::Vector3(5,30,5), "Mass: 50");

Well.. when I look at mBody, after this code has been executed... well mNodeRenderable is NULL (well == 0x00000000000000)

so that may be the problem (I assume, when there's a pointer pointing to null.. it's just not good)..

I'm gonna add the way I set the renderer

RenderSystem *rs = pRoot->getRenderSystemByName("Direct3D9 Rendering Subsystem");
// or use "OpenGL Rendering Subsystem"

rs->setConfigOption("Full Screen", "No");
rs->setConfigOption("Video Mode", "800 x 600 @ 32-bit colour");
pRoot->setRenderSystem(rs);

I've tried it with direct3d and opengl.. both the same error..

NxOgre::Body* mBody = mScene->createBody("OgreHead.mesh", new NxOgre::Cube(0.5f), Ogre::Vector3(5,30,5), "Mass: 50");
Maybe it's a 1.5 feature (I don't know - never used), but AFAIK (1.0.22) it's not designed to use Ogre::Vector3, but NxOgre::Pose();
I also don't like the string params. IMHO this is a far better way to go:

NxOgre::ActorParams ap;
ap.SetToDefault();
ap.mass = 50;
NxOgre::Body* mBody = mScene->createBody("OgreHead.mesh", new NxOgre::Cube(0.5f), NxOgre::Pose(5,50,5), ap);

No way to make typewrite errors such as "masss: 50"
I also prefer to use the NxOgre::NodeRenderableParameters, but first get the above code running.

Next use your own BodyClasses ( http://nxogre.org/Inheriting_Actor_and_ ... type_class )


NxString myName("MyActorName");
NodeRenderableParams nrp;
nrp.setToDefault();
nrp.mGraphicsModel = "OgreHead.mesh";
nrp.mIdentifier = myName;
nrp.mIdentifierUsage = NxOgre::NodeRenderableParams::IU_Create;
nrp.mMode = NxOgre::RenderableSource::RM_Interpolate;
nrp.mGraphicsModelPose = pose;
// nrp.mGraphicsModelScale = NxVec3(1,1,1);

YourBodyClass* myBody = new YourBodyClass(myName, pose, shape, mScene, nrp, ap);

The Ogre::Quaternion and Ogre::Vector3 can be used instead of a Pose in Bleeding and previous versions, there is a special constructor and operators to handle this.

Check to see if "OgreHead.mesh" actually exists in your media.

i have the same problem.... seems the "error code" is here in Body constructor:

Body::Body(const NxString& identifier, Scene* scene, Shape *firstShapeDescription,
const Pose& pose, const NodeRenderableParams& visualParams, const ActorParams& params)
...
setRenderMode(visualParams.mMode);
mRenderable = mOwner->getSceneRenderer()->createNodeRenderable(visualParams);

// after mOwner->getSceneRenderer() call - we've got mSceneRender
// and its type is NullSceneRenderer, and its createNodeRenderable(NodeRenderableParams) method retuns NULL
// thus we've got mRenderable = NULL
...
}
and later here we've got an exception:
void RenderableSource::render_Absolute(const TimeStep& ts) {
mRenderPose = getSourcePose(ts);
mRenderable->setPose(mRenderPose);
}
'cause mRenderable is still NULL......

may be it's happend 'cause we did't consider this author` warrning enough:
"/** \brief Body is an example of an Actor using a NodeRenderable
\note This is merely an example on how to uses visualisation in NxOgre, it shouldn't
be used for serious things.
*/"
is anybody have suggestions...... i'm a newbie in NxOgre, so sorry if something wrong....

My suggestion would be: download cake. Play around with it. It's a good start. Add some bodies into it. Later try implementing NxOgre into your application.

My suggestion would be: download cake. Play around with it. It's a good start. Add some bodies into it. Later try implementing NxOgre into your application.

I've downloaded cake 4.0T1, i've put it in NxOgre 1.0`22 directory and the compile it... and i've got 53 errors.... most of them are so silly like that:

mRenderable = static_cast<OgreNodeRenderable*>(mActor->getVoidPointer()->RenderPtr->getRenderable()); // insted of getUserData()
but some of them i can't solve by just renaming methods, like this:
NxOgre::Raycaster* mRay; i don't know does Raycaster really exists....
and so on....

may you suggest what kind of versions of each Ogre, NxOgre, Cake and PhysX i have to use to have done succesfully compilation...

currently i have, as i mentioned above, NxOgre 1.0`22(from svn, how suggested here http://www.ogre3d.org/wiki/index.php/Nx ... ple_Sample), Cake 4.0T1, PhysX 2.8.1 and OGRE SDK 1.6.1...... is it enough fo succesfull compile, and if yes how to achieve it???
PLEASE HELP!!!

ok.... i've figure out with my problem on the Body creation......
now i see created boxes falling down to the plane, but they fall very slow..... gravity sets to -9.8 and fps is pretty high - around 100.... but the fall like gravity -1.5 not -9.8
earlier when i've integrated PhysX in Ogre the speed of objects on the scene was depend on "value" in NxScene::simulate(value) the acceptable speed was when i set this value to 1........
what should i do in NxOgre app to increase the object` speed?


SceneParams sp;
sp.setToDefault();
sp.mController = NxOgre::SceneParams::CN_ACCUMULATOR;
sp.mGravity.set(0,-9.8f,0);
// sp.mSimulationType = NX_SIMULATION_HW;
sp.mUp = 1;
sp.mRenderer = NxOgre::SceneParams::RN_OGRE;
mScene = mWorld->createScene("ScenePhysX", mSceneMgr, sp);
and create a
class physXlistener : public Ogre::FrameListener
{
public:
physXlistener(NxOgre::World* world, NxOgre::Scene* scene) : Ogre::FrameListener()
{
mWorld = world;
mScene = scene;
mPause = false;
}
bool isPaused() const { return mPause; }
void setPause(bool val) { mPause = val; }
protected:
NxOgre::World* mWorld;
NxOgre::Scene* mScene;
bool mPause;
bool frameStarted(const Ogre::FrameEvent& evt)
{
if(!mPause)
{
mWorld->simulate(evt.timeSinceLastFrame);
mWorld->render(evt.timeSinceLastFrame);
}
return true;
}
};
and register it with mRoot->addFrameListener