C#•13mo ago

JoltPhysicsSharp access violation

Hi, I'm trying to use JoltPhysicsSharp in my project, and I started with the HelloWorld.cs example provided, and it works fine, but when I try to call CreateAndAddBody again, it gives me an access violation

1 Reply

nutOP•13mo ago

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Repeat 2 times:
--------------------------------
   at JoltPhysicsSharp.JoltApi.JPH_BodyInterface_CreateAndAddBody(IntPtr, IntPtr, JoltPhysicsSharp.Activation)
--------------------------------
   at JoltPhysicsSharp.BodyInterface.CreateAndAddBody(JoltPhysicsSharp.BodyCreationSettings, JoltPhysicsSharp.Activation)

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Repeat 2 times:
--------------------------------
   at JoltPhysicsSharp.JoltApi.JPH_BodyInterface_CreateAndAddBody(IntPtr, IntPtr, JoltPhysicsSharp.Activation)
--------------------------------
   at JoltPhysicsSharp.BodyInterface.CreateAndAddBody(JoltPhysicsSharp.BodyCreationSettings, JoltPhysicsSharp.Activation)

this is the problematic code:

MeshShapeSettings settings = new MeshShapeSettings(marchingCubes.getTriangles().Select(e => e.ToPhysicsTriangle()).ToArray());
BodyCreationSettings bodySettings = new BodyCreationSettings(settings, new Vector3(Position.X * World.CHUNK_SIZE, 0, Position.Y * World.CHUNK_SIZE), Quaternion.Identity, MotionType.Static, Jolt.Layers.NonMoving);
Jolt.BodyInterface.CreateAndAddBody(bodySettings, Activation.DontActivate);

MeshShapeSettings settings = new MeshShapeSettings(marchingCubes.getTriangles().Select(e => e.ToPhysicsTriangle()).ToArray());
BodyCreationSettings bodySettings = new BodyCreationSettings(settings, new Vector3(Position.X * World.CHUNK_SIZE, 0, Position.Y * World.CHUNK_SIZE), Quaternion.Identity, MotionType.Static, Jolt.Layers.NonMoving);
Jolt.BodyInterface.CreateAndAddBody(bodySettings, Activation.DontActivate);

all it does is convert a list of my own triangles to Jolt's triangles, use it to create a mesh, then create body settings from that mesh, and then create and add the body to the world the class Jolt follows a singleton pattern:

    public static Jolt Instance { get; private set; }

    private BodyInterface bodyInterface;
    public static BodyInterface BodyInterface {
        get {
        return Instance.bodyInterface;
        }
}

    private PhysicsSystem physicsSystem;

    public static PhysicsSystem PhysicsSystem { get => Instance.physicsSystem; }

    public static Jolt Initialize()
    {
        if(Instance == null)
        {
            Instance = new Jolt();
        }
        return Instance;
    }

    public static Jolt Instance { get; private set; }

    private BodyInterface bodyInterface;
    public static BodyInterface BodyInterface {
        get {
        return Instance.bodyInterface;
        }
}

    private PhysicsSystem physicsSystem;

    public static PhysicsSystem PhysicsSystem { get => Instance.physicsSystem; }

    public static Jolt Initialize()
    {
        if(Instance == null)
        {
            Instance = new Jolt();
        }
        return Instance;
    }

the constructor looks like this, mostly just the HelloWorld example:

 private Jolt()
 {
     if (!Foundation.Init(true))
     {
         return;
     }

     
     // Malloc
     using TempAllocator tempAllocator = new(10 * 1024 * 1024);
     using JobSystemThreadPool jobSystem = new(Foundation.MaxPhysicsJobs, Foundation.MaxPhysicsBarriers);
     using BPLayerInterfaceImpl broadPhaseLayer = new();
     using ObjectVsBroadPhaseLayerFilterImpl objectVsBroadphaseLayerFilter = new();
     using ObjectLayerPairFilterImpl objectVsObjectLayerFilter = new();

     physicsSystem = new();
     physicsSystem.Init(MaxBodies, NumBodyMutexes, MaxBodyPairs, MaxContactConstraints,
         broadPhaseLayer,
         objectVsBroadphaseLayerFilter,
         objectVsObjectLayerFilter);

     // ContactListener
     physicsSystem.OnContactValidate += OnContactValidate;
     physicsSystem.OnContactAdded += OnContactAdded;
     physicsSystem.OnContactPersisted += OnContactPersisted;
     physicsSystem.OnContactRemoved += OnContactRemoved;
     // BodyActivationListener
     physicsSystem.OnBodyActivated += OnBodyActivated;
     physicsSystem.OnBodyDeactivated += OnBodyDeactivated;

     bodyInterface = physicsSystem.BodyInterface;

     //Foundation.Shutdown();
 }

 private Jolt()
 {
     if (!Foundation.Init(true))
     {
         return;
     }

     
     // Malloc
     using TempAllocator tempAllocator = new(10 * 1024 * 1024);
     using JobSystemThreadPool jobSystem = new(Foundation.MaxPhysicsJobs, Foundation.MaxPhysicsBarriers);
     using BPLayerInterfaceImpl broadPhaseLayer = new();
     using ObjectVsBroadPhaseLayerFilterImpl objectVsBroadphaseLayerFilter = new();
     using ObjectLayerPairFilterImpl objectVsObjectLayerFilter = new();

     physicsSystem = new();
     physicsSystem.Init(MaxBodies, NumBodyMutexes, MaxBodyPairs, MaxContactConstraints,
         broadPhaseLayer,
         objectVsBroadphaseLayerFilter,
         objectVsObjectLayerFilter);

     // ContactListener
     physicsSystem.OnContactValidate += OnContactValidate;
     physicsSystem.OnContactAdded += OnContactAdded;
     physicsSystem.OnContactPersisted += OnContactPersisted;
     physicsSystem.OnContactRemoved += OnContactRemoved;
     // BodyActivationListener
     physicsSystem.OnBodyActivated += OnBodyActivated;
     physicsSystem.OnBodyDeactivated += OnBodyDeactivated;

     bodyInterface = physicsSystem.BodyInterface;

     //Foundation.Shutdown();
 }

im just wondering if physics system is getting disposed of somehow it shouldn't though? hold up, i removed the using keywords and it works now that was from the helloworld example

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JoltPhysicsSharp access violation