Demo got stuck when emitting amount of shapes in tiny size at one

[labbbirder]

The system seems to be unstable when deal with very tiny shapes. Tested on the latest master branch.

Steps to Reproduce

1. change the Shoot method to produce tiny shapes:

    Random rand = new(123);
    public void ShootPrimitive()
    {
        const float primitiveVelocity = 20.0f;

        var pos = Camera.Position;
        var dir = Camera.Direction;

        var sb = World.CreateRigidBody();
        sb.Position = Conversion.ToJitterVector(pos);
        sb.Velocity = Conversion.ToJitterVector(dir * primitiveVelocity);

        //var ss = new BoxShape(0.3f);
        var ss = new BoxShape(rand.Next(1, 4) / 1000f);
        sb.AddShape(ss);
    }

2. change the Control method to shoot a alot at once:

    for (int i = 0; i < 10; i++)
    {
        ShootPrimitive();
    }

3. Run the demo and press space.

[labbbirder]

Additionally, there is another issue, may be a same problem as described below:

I continuously spawning tiny size shapes, meanwhile, I remove the rigidbody in world randomly. Soon got a exception says Shapes passed to default narrow phase collision handler are not associated with a rigid body

System.InvalidOperationException
  HResult=0x80131509
  Message=Shapes passed to default narrow phase collision handler are not associated with a rigid body.
  Source=Jitter2
  StackTrace:
   at Jitter2.World.Detect(Shape sA, Shape sB) in E:\UnityProjects\jitter2\src\Jitter2\World.Detect.cs:line 289
   at Jitter2.World.DetectCollisionsCallback(Batch batch) in E:\UnityProjects\jitter2\src\Jitter2\World.Step.cs:line 451
   at Jitter2.World.DetectCollisions(Boolean multiThread) in E:\UnityProjects\jitter2\src\Jitter2\World.Step.cs:line 764
   at Jitter2.World.Step(Single dt, Boolean multiThread) in E:\UnityProjects\jitter2\src\Jitter2\World.Step.cs:line 144
   at JitterDemo.Playground.Draw() in E:\UnityProjects\jitter2\src\JitterDemo\Playground.cs:line 127
   at JitterDemo.Renderer.OpenGL.GLFWWindow.Sync() in E:\UnityProjects\jitter2\src\JitterDemo\Renderer\OpenGL\GLFWWindow.cs:line 291
   at JitterDemo.Renderer.OpenGL.GLFWWindow.Open(CreationSettings settings) in E:\UnityProjects\jitter2\src\JitterDemo\Renderer\OpenGL\GLFWWindow.cs:line 179
   at JitterDemo.Program.Main() in E:\UnityProjects\jitter2\src\JitterDemo\Program.cs:line 25

Maybe it'a problem caused by DynamicTree.

I want to known why the tiny shapes so different, and how to solve the problems.

Here is the additional modification:

...
        if (Keyboard.KeyPressBegin(Keyboard.Key.M))
        {
            multiThread = !multiThread;
        }

-        if (!GuiRenderer.WantsCaptureKeyboard && Keyboard.KeyPressBegin(Keyboard.Key.Space))
+        if (!GuiRenderer.WantsCaptureKeyboard && Keyboard.IsKeyDown(Keyboard.Key.Space))
        {
-            ShootPrimitive();
+            for (int i = 0; i < 2; i++)
+            {
+                ShootPrimitive();
+            }
        }
+        if (rand.Next(2) == 1)
+        {
+            var idx = rand.Next(world.RigidBodies.Count);
+            if (idx>4) world.Remove(world.RigidBodies[idx]);
+        }

         base.Draw();
...

[notgiven688]

@labbbirder : Thanks for the report! Just to keep things sorted: Can you open a separate issue for the "Shapes passed to default narrow phase collision handler are not associated with a rigid body"-problem? Another user also reported this and I was not able to reproduce it, yet.