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• croc
  
  Community Member
  1 posts

  how to setUserContactReport() ?

  20 September 2009 at 10:04am

  Basing on a sample provided in the PhysX SDK I've been trying to make the physics system notify me when a collision of two specified objects takes place. Simple scene test looks like this (last lines are essential):

   
          public override void CreateScene()
          {
              physicsSpace = new PhysicsSpace();
   
              Matrix transform = Matrix.Identity;
              Matrix box_transform = Matrix.RotationX(3.1415f / 4) * Matrix.Translation(0, 9.81f, 0);
   
              NxPlaneShapeDesc planedesc = new NxPlaneShapeDesc();
              planedesc.normal = Utils.vec3(0, 1, 0);
              planedesc.d = 0;
   
              plane = physicsSpace.CreateStatic(planedesc, ref transform);
   
              NxBoxShapeDesc boxdesc = new NxBoxShapeDesc();
              boxdesc.dimensions = Utils.vec3(2,2,2);
   
              box = physicsSpace.CreateDynamic(boxdesc, ref box_transform, 10);
   
   
   
              physicsSpace.Scene.setUserContactReport(new ContactReport());
              physicsSpace.Scene.setActorPairFlags(plane, box, (uint)NxContactPairFlag.NX_NOTIFY_ON_TOUCH);
   
          }
   

  Last two function calls are taken directly from the sdk sample. ContactReport is a class overriding onContactNotify function. But before it's called, following error occurs when the collision takes places:

  
  System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.\r\n at PhysX_sharp.NxScene.NxScene_fetchResults_1_INVOKE(HandleRef classPointer, Boolean call_explicit, NxSimulationStatus status, Boolean block)\r\n at PhysX_sharp.NxScene.fetchResults(NxSimulationStatus status, Boolean block)\r\n ........
  

  If there's no userContactReport or NX_NOTIFY is set to ignore nothing wrong happens. It seems that there's a problem with passing a managed c# instance to unmanaged code. My question is how should I use this feature? Is there an alternative?