SimpleCloth in NxOgre

I have basic understanding of how cloth is created in Ageia
The mycloth class as mkh42 described

I now tried in tutorial nxogre101 a simple program to create cloth



void start()
mWorld = newWorld();
mWorld->getPhysXDriver()->createDebuggerConnection();
mScene = mWorld->createScene("myScene", mSceneMgr);
mScene->setGravity(Ogre::Vector3(0,-9.8,0));
mScene->addFloor();


ClothParams cp;
cp.thickness = 0.2;
cp.bendingStiffness = 0.5;
cp.friction = 0.25;
cp.flags |= NX_CLF_BENDING;
cp.flags |= NX_CLF_COLLISION_TWOWAY;
cp.flags |= NX_CLF_HARDWARE;
cp.height=3;
cp.width=2;
cp.meshMaterial="nx.flag";
cp.density = 0.15;

mScene->createCloth("This is my cloth name",
NxOgre::Pose(Ogre::Vector3(0, 4, 0)),
cp);


But the program lands into trouble when accesing mcloth pointer in the NxOgreCloth.cpp with mcloth=0X00000000

what can I do?
you are really fast betajaen

[Beware: I never worked with cloths so far -> just a proposal]

Try it with the second overload version of the createCloth() function and give as mesh as parameter (in the CakeApp is one).

how about the third overload function with
NxClothDesc,NxMeshData and Meshptr


I want to implement a simple cloth...bare minimum

I am using the latest NxOgre but running tutorial 0.42 which is the only tutorial I have got.
I am using the old tutorial with new Nxogre_d.dll. i have other tutorials like joint and multishape actors running but not the cloth.help me out


please write a small code in the start() of the tutorial to create a cloth

Isn't your code allready creating a cloth? Or where is your problem?

No it is not.Any simple code will do for me
thank you spacegaeir for responding

Don't know why your code crashes (also on my PC). However, the following lines work fine:

NxOgre::ClothParams cp("mesh-material: nx.flag, density: 0.15, thickness: 0.2, blending-stiffness: 0.7, friction: 0.25, width: 2, height: 3");
cp.flags |= NX_CLF_BENDING;
cp.flags |= NX_CLF_HARDWARE;
cp.flags |= NX_CLF_COLLISION_TWOWAY;
NxOgre::Cloth *cloth = m_pNxScene->createCloth("cloth", NxOgre::Pose(Vector3(0,10,0)), cp);

Thank you Spacegaier The code is perfect.It helped me to create a cloth.
Also I now know that a string can be passed in the constructor for many params class.

Hi Spacegaier look at this code .I have added additional peice to your code for creating a cloth pressure as in ageia
1.Cube.1m.mesh
and Cloth pressure


NxOgre::ClothParams cp("mesh-material: nx.flag, density: 0.15, thickness: 0.2, blending-stiffness: 0.7, friction: 0.25, width: 2, height: 3");
cp.flags |= NX_CLF_BENDING;
cp.flags |= NX_CLF_HARDWARE;
cp.flags |= NX_CLF_COLLISION_TWOWAY;

cp.flags|=NX_CLF_PRESSURE;
cp.pressure=2.0f;

NxOgre::Cloth *cloth = mScene->createCloth("cloth", "cube.1m.mesh" ,NxOgre::Pose(Vector3(0,10,0)), cp);


it is crashing what do you think is the solution

In Physx i usually would read in the .obj files.
I have also read the thread were they have differentiated why mesh file of a cube and obj of the same are different

It fails during memcpy while in the _createmesh() function

I can't really help you at the moment for two reasons:

1. I have to learn as I'm writing my final exams in two weeks (that is the smallest problem).

2. I almost have no experiences with cloths (in fact I first looked at them because of your cloth thread). However, I think I have found your problem: In the AGEI PhsyX SDK documentation it says something like the meshes have to be cooked. I don't know whether NxOgre is doing this for you, so I would advise you to just try it in PhsyX code (to do so, just add the following line: #include <NxPhysics.h>, then you be able to directly use PhsyX code in your app. Try to cook a mesh with the help of the PhsyX docu.

Also look at this: http://www.ogre3d.org/phpBB2addons/view ... =165#25879
There it says closed mesh, what ever that will mean (betajaen?).

In my learning breaks I'll probably take a look again on this topic.

All the very best for your exams

Yeah I will surely look into that and duly reply you back

The cloth class there makes and cooks everything for you. Surprisingly how complicated the code is - it's quite stable.

So I would ask to start off; Do you have the NxCooking.dll in the same directory as the NxOgre one?

Yes, it is in the same directory.

betajaen: What is meant by closed mesh? What attributes does the mesh have to have?

Closed meshes are basically ones without any holes. Such as a sphere or a cube, open meshes would be a plane, or a football field.

I would make sure normal cloth works before you play around with the pressurised kind.

Hi Spacegaeir I created the pressurized cloth.

But no matter what amount of pressure i set the ball does not bounce