When rapidly pressed '1-5' key to drop stuff, It will crashed.

• Here is the screenshot:
  
• Here is the crash report:

  Crashed Thread:        0  Dispatch queue: com.apple.main-thread
  Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
  Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000
  Exception Codes:       0x0000000000000001, 0x0000000000000000
  Exception Note:        EXC_CORPSE_NOTIFY
  
  Termination Reason:    Namespace SIGNAL, Code 11 Segmentation fault: 11
  Terminating Process:   exc handler [85566]
  
  VM Region Info: 0 is not in any region.  Bytes before following region: 4538880000
        REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
        UNUSED SPACE AT START
  --->  
        __TEXT                      10e89d000-10ea05000    [ 1440K] r-x/r-x SM=COW  ...nts/*/testbed
  
  Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
  0   testbed                       	       0x10e914c3c b2TreeNode::IsLeaf() const + 12 (b2_broad_phase.h:40)
  1   testbed                       	       0x10e8f574d void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 45 (b2_broad_phase.h:589)
  2   testbed                       	       0x10e8f58ed void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 461 (b2_broad_phase.h:619)
  3   testbed                       	       0x10e8f5846 void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 294 (b2_broad_phase.h:607)
  4   testbed                       	       0x10e8f58ed void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 461 (b2_broad_phase.h:619)
  5   testbed                       	       0x10e8f5846 void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 294 (b2_broad_phase.h:607)
  6   testbed                       	       0x10e8f5846 void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 294 (b2_broad_phase.h:607)
  7   testbed                       	       0x10e8f58ed void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 461 (b2_broad_phase.h:619)
  8   testbed                       	       0x10e8f5846 void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 294 (b2_broad_phase.h:607)
  9   testbed                       	       0x10e8f5846 void b2BroadPhase::QueryAll<b2ContactManager>(b2ContactManager*, b2TreeNode const*, b2TreeNode**, int) const + 294 (b2_broad_phase.h:607)
  10  testbed                       	       0x10e8f475b void b2BroadPhase::UpdateAndQuery<b2ContactManager>(b2ContactManager*) + 1067 (b2_broad_phase.h:324)
  11  testbed                       	       0x10e8f431c b2ContactManager::FindNewContacts() + 28 (b2_contact_manager.cpp:119)
  12  testbed                       	       0x10e910ff8 b2World::Solve(b2TimeStep const&) + 2360 (b2_world.cpp:666)
  13  testbed                       	       0x10e91303e b2World::Step(float, int, int, int) + 478 (b2_world.cpp:1151)
  14  testbed                       	       0x10e8b5b45 Test::Step(Settings&) + 501 (test.cpp:362)
  15  testbed                       	       0x10e8ceeb3 EdgeShapes::Step(Settings&) + 99 (edge_shapes.cpp:207)
  16  testbed                       	       0x10e8a9cca main + 1338 (main.cpp:595)
  17  dyld                          	       0x11954052e start + 462
  

• Here is the lldb reports:

  * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
      frame #0: 0x000000010008e368 testbed`b2Fixture::RayCast(this=0x0000000130033e31, output=0x00007ff7bfefe260, input=0x00007ff7bfefe3b0) const at b2_fixture.h:385:19
     382   
     383   inline bool b2Fixture::RayCast(b2RayCastOutput* output, const b2RayCastInput& input) const
     384   {
  -> 385     return m_shape->RayCast(output, input, m_body->GetTransform());
     386   }
     387   
     388   inline void b2Fixture::GetMassData(b2MassData* massData) const
  

  * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x41)
      frame #0: 0x000000010001828c testbed`b2Fixture::GetBody(this=0x0000000000000031) at b2_fixture.h:310:10
     307   
     308   inline b2Body* b2Fixture::GetBody()
     309   {
  -> 310     return m_body;
     311   }
     312   
     313   inline const b2Body* b2Fixture::GetBody() const
  

I tested it many times, and produced many kinds of errors.

For some reason after proceeding with Step function if i try create new dynamic object and number of dynamic object is more then 28 I get crash at ContactManager::FindNewContacts.

I don't have such issue with original lib.
Am I suppose to suppose to set up something?
Thank you.

inside b2BroadPhase::UpdateAndQuery(T* callback)

There are some bugs in the reworked TOI implementation that make it not work correctly.

• It looks like bullet bodies work, at least to some extend, as can be found out by playing around with the "Add pair" testbed scene.
• Dynamic vs static isn't working. This can be seen in the "Platformer" testbed scene when compared to Box2d.

I need to fix these issues and investigate the correctness of the TOI implementation in general.

If you create a body, defining it as static in BodyDef. And then you will try to transform to another position (even slightly), then it becomes completely broken. Collisions mostly stop working. Dynamic bodies don't interact with it, flying through, get pushed in random locations.

But debug draw draws them correctly.

To reproduce use this code for static bodies in Tiles Test:

			float a = 0.5f;
			int32 N = 200;
			int32 M = 10;
			b2Vec2 position;
			position.y = 0.0f;
			for (int32 j = 0; j < M; ++j)
			{
				position.x = -N * a;
				for (int32 i = 0; i < N; ++i)
				{
					b2BodyDef bd;
					bd.position = position;
					b2Body* ground = m_world->CreateBody(&bd);

					b2PolygonShape shape;
					shape.SetAsBox(a, a);
					ground->CreateFixture(&shape, 0.0f);
					++m_fixtureCount;
					position.x += 2.0f * a;
					ground->SetTransform(position+b2Vec2(-1, -1), 0.1);

				}
				position.y -= 2.0f * a;
			}

C++ does not support variable size arrays on the stack.

Also in benchmarks.h there a several warnings like:

box2d-optimized\benchmarks\benchmarks.h(556,30): warning C4244: '=': conversion from 'int' to 'float', possible loss of data

Double free

There exists some issue that prevents the 'Platformer' scene from working correctly in the testbed.

I got some compiler errors...

Once be: b2ChainShape unknown

I thought In can use Box2D-optimized without any changes on my Box2D app.
Only switching from Box2D to Box2D-optimized and can use my original sources whitout any changes.

Found this via the benchmarks page, and honestly, it looks really good. Is there any reason for keeping it as a separate project instead of merging the optimisations into the base library?

Due to the nature of this fork ditching the .sln file for building the bat file no longer works. Please either consider creating a new Visual Studio Solution, or update the readme with relevant library installation instructions.

I would love to use this library but without proper build instructions out of the box it feels like wasted extra steps

When press key 's' or 'k' to change body type, it will crash. It's a debug build.

• Here is the screenshot.
  
• Here is the llbd report:

   * thread #1, queue = 'com.apple.main-thread', stop reason = hit program assert
       frame #4: 0x00000001000741cf testbed`b2Island::Add(this=0x00007ff7bfefeaf0, contact=0x000000010084f000) at b2_island.h:67:5
      64  	
      65  	  void Add(b2Contact* contact)
      66  	  {
   -> 67  	    b2Assert(m_contactCount < m_contactCapacity);
      68  	    m_contacts[m_contactCount++] = contact;
      69  	  }
      70  	
   Target 0: (testbed) stopped.