cookTriangleMesh access exception

Question

PxTriangleMesh* PhysX::CreateTriangleMesh(const PxVec3* verts, const PxU32 numVerts
    , const PxU32* indexs, const PxU32 numIndexes, PxPhysics* physics, PxCooking* cooking)
{
    // Create descriptor for triangle mesh
    PxTriangleMeshDesc meshDesc;
    meshDesc.points.count = numVerts;
    meshDesc.points.stride = sizeof(PxVec3);    
    meshDesc.points.data = verts;

    meshDesc.triangles.count = numIndexes / 3;
    meshDesc.triangles.stride = 3 * sizeof(PxU32);
    meshDesc.triangles.data = indexs;

    // for prevent stackoverflow
    PxU32 estimatedVertSize = numVerts * sizeof(PxVec3) * 1.5;
    PxU32 estimatedIndexSize = numIndexes * sizeof(PxU32) * 1.5;
    PxU32 initialSize = estimatedVertSize + estimatedIndexSize;
    CustomPhysXMemory writeBuffer(initialSize);

    //PxDefaultMemoryOutputStream writeBuffer;
    bool status = cooking->cookTriangleMesh(meshDesc, writeBuffer);
    if (!status)
        return nullptr; 

    PxDefaultMemoryInputData readBuffer(writeBuffer.getData(), writeBuffer.getSize());
    PxTriangleMesh* triangleMesh = physics->createTriangleMesh(readBuffer);

    return triangleMesh;
}

I want to give a collider to mesh that load by assimp so I made a physX triangleMesh. In many situations, it works But sometimes in cookTriangleMesh Exception thrown at 0x00007FFD322F259E (PhysXCooking_64.dll) in Client.exe: 0xC0000005: Access violation reading location 0x0000019F69AA8000. occurs.

I was worried about the capacity of buffer and gave him a 1.5 times space, and I checked ((physx::PxSimpleTriangleMesh)&meshDesc),nd {points={count=82772 } triangles={count=43798 } flags={mBits=0 } } writeBuffer.mBuffer.capacity() 2278260 These two always came out the same either success or failure..

So I don't have a clue what the problem is. Can someone who knows the problem and how to solve it help me?

KimKulling · Accepted Answer · 2023-10-13 09:27:19Z

0

This is not a problem which is related to Assimp. I checked the Physix-API and I was wondering why you have calculated a initial size.

In this example the writebuffer was not initialided: Physix Example

Maybe this would be an option for you? And I strongly recommend to use the validation methods to get more information aabout your issue:

#ifdef _DEBUG
    // mesh should be validated before cooked without the mesh cleaning
    bool res = theCooking->validateTriangleMesh(meshDesc);
    PX_ASSERT(res);
#endif

PxTriangleMesh* aTriangleMesh = theCooking->createTriangleMesh(meshDesc,
thePhysics->getPhysicsInsertionCallback());

Hope that helps a little bit.

answered Oct 13, 2023 at 9:27

KimKulling

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