Several newbie questions for Physx 3

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Hello Everyone. This is my first post here

Today, I tried to play around Physx and Physx visual debugger and as always, newbies have problems and questions. I'll try to describe my problems as best as I can with my poor english skills.

1) I managed to create a physx scene. added a dynamic actor and manipulated it. I see in Visual Debugger it's motion. It's a standard PxSphereGeometry ball. However, when I add a second ball in the scene, the second one is not visible, but I can see that collision happens. Here's the code and if anyone can point me what's wrong with it I'd be very grateful:

 PxMaterial* mMaterial; mMaterial = mPhysics->createMaterial(0.5f, 0.5f, 0.5f); //static friction, dynamic friction, restitution if(!mMaterial) error("createMaterial failed!"); PxVec3 position(0, 50, 0); PxRigidDynamic* aSphereActor = PxCreateDynamic(*mPhysics, PxTransform(position), PxSphereGeometry(3), *mMaterial, 1.f); PxRigidDynamic* aTrActor = PxCreateDynamic(*mPhysics, PxTransform(PxVec3(3, 1, 1)), PxSphereGeometry(3), *mMaterial, 1.1f); if(!aSphereActor) error("Unable to create sphere actor"); aSphereActor->setMass(1); aTrActor->setMass(10); PxRigidStatic* plane = PxCreatePlane(*mPhysics, PxPlane(PxVec3(0,1,0), 0), *mMaterial); if (!plane) error("create shape failed!"); mScene->addActor(*plane); mScene->addActor(*aSphereActor); mScene->addActor(*aTrActor); while(true) { mScene->simulate(1.0f / 30.0f); if(!mScene->fetchResults(true)) error("cant fetch result"); Sleep(10); } 
In this scene, aSphereActor collides with aTrActor, but I can't see aTrActor in Visual Debugger, however collision is perfectly visible.

2) Nvidia's documentation is very very poor. It's a torture for newbies like me to find it's way through it. So I wanted to know how can I import a 3d model and add it in the scene. I know there is a Physx plugins for 3ds max, maya etc. Say I have a model exported with this plugin, how can I import it in my app and add it to the scene?

3) During the creation of the scene sceneDesc.gravity = PxVec3(0.0f, -9.81f, 0.0f);, what value should I provide to get a real gravity, the one we have on earth

4) I can assign a mass to an actor, however I don't know in which measurement unit the mass is. For example, if I set aSphereActor->setMass(1); will aSphereActor will be 1kg, gram or what?

Thank you very much everyone. I appreciate your help.