How to enhance the collision detector

[zzp]

When I start the simulation the collision detector is not always valid. Firstly, I set Simulation timeMode to VirtualTime, and set speedFactor to 4. Then I start the simulation asynchronously, the collision detector is a bit ineffective.
The start code:

Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Send, new System.Action(StartSimulation));

The simulation settings:

        public void TestFun()
        {
            //simulationFlag = 1;
            ISimulation simulation = _application.Simulation;
            simulation.TimeMode = SimulationTimeMode.VirtualTime;
            resetSimulation();
            simulation.RunTime = 100;
            simulation.SpeedFactor = 1;
            simulation.WarmupTime = 0;
            simulation.SaveState();
            simulation.Run(100);

        }

[TSy]

What exactly do you mean with “the collision detector is not always valid”? Are you getting VisualComponents.Create3D.InvalidWrapperExceptions?
If that happens then the underlying object has been deleted and your code can’t use it anymore.

[zzp]

No, I think the problem is from the SpeedFactor. I take a test that the bigger I set the SpeedFactor, the less accurate detector is. For Example, when I set SpeedFactor to 10 and launch simulation, it is no problem. But I set SpeedFactor to 0.04, everything else remains the same, and restart simulation. It shows that the collision happened.

[TSy]

The collision detection is by default done only when the world is rendered.

Confidence in collision detection

I think in general VC’s collision detection does not support any kind of “penetration depth” analysis. It simply calculates whether any of the triangles of the chosen mesh geometries intersect, and if distance is desired to be known, minimum distance between those meshes by calculating distances between vertices, edges, and triangle faces. Also the meshes generally don’t have “inside” and “outside” defined, but it makes no difference for this particular purpose which only considers intersection…

You can use IApplication.TestAllCollisionDetectors() to force a test to occur.
If you want to run some logic at specific times of simulation time (such as regular interval), use ISimulation.ScheduleCallback(...) method.

[zzp]

Are there some differences between detector.TestAllCollisions() and IApplication.TestAllCollisionDetectors()

[TSy]

Don’t know, maybe the IApplication one skips disabled detectors or something.