Engine Crash - ComputeCentroid (Solved)

WhiteBoxDev · January 31, 2023, 9:56pm

After some refactoring, I am unable to spawn a certain game object from a factory:

local id = factory.create(msg.url(nil, h_str.go_factory, "factory_bullet"), origin)

The arguments are all valid. The bullet game object looks like this:

Screenshot 2023-01-31 133223

The crash report looks like this:

Assertion failed: area > 1.192092896e-07F, file ..\src\box2d\Box2D\Collision\Shapes\b2PolygonShape.cpp, line 123

ERROR:CRASH: CALL STACK:

ERROR:CRASH:  0 0x7FF76AD8EB00 dmCrash::GenerateCallstack D:\a\defold\defold\engine\crash\src\backtrace_win32.cpp:144

ERROR:CRASH:  1 0x7FF76B04F800 raise /tmp/job3346579891437359884/minkernel/crts/ucrt/src/appcrt/misc/signal.cpp:547

ERROR:CRASH:  2 0x7FF76B0437F4 abort /tmp/job3346579891437359884/minkernel/crts/ucrt/src/appcrt/startup/abort.cpp:71

ERROR:CRASH:  3 0x7FF76B042A40 common_assert_to_stderr<wchar_t> /tmp/job3346579891437359884/minkernel/crts/ucrt/src/appcrt/startup/assert.cpp:186

ERROR:CRASH:  4 0x7FF76B042564 _wassert /tmp/job3346579891437359884/minkernel/crts/ucrt/src/appcrt/startup/assert.cpp:443

ERROR:CRASH:  5 0x7FF76AF27150 ComputeCentroid D:\a\defold\defold\engine\physics\src\box2d\Box2D\Collision\Shapes\b2PolygonShape.cpp:123

ERROR:CRASH:  6 0x7FF76AF25B60 b2PolygonShape::Set D:\a\defold\defold\engine\physics\src\box2d\Box2D\Collision\Shapes\b2PolygonShape.cpp:180

ERROR:CRASH:  7 0x7FF76AEBF920 dmPhysics::TransformCopyShape D:\a\defold\defold\engine\physics\src\physics\physics_2d.cpp:819

ERROR:CRASH:  8 0x7FF76AEBB290 dmPhysics::NewCollisionObject2D D:\a\defold\defold\engine\physics\src\physics\physics_2d.cpp:967

ERROR:CRASH:  9 0x7FF76AE995D0 dmGameSystem::CreateCollisionObject D:\a\defold\defold\engine\gamesys\src\gamesys\components\comp_collision_object.cpp:410

ERROR:CRASH: 10 0x7FF76AE973C0 dmGameSystem::CompCollisionObjectCreate D:\a\defold\defold\engine\gamesys\src\gamesys\components\comp_collision_object.cpp:459

ERROR:CRASH: 11 0x7FF76ADCDDC0 dmGameObject::CreateComponents D:\a\defold\defold\engine\gameobject\src\gameobject\gameobject.cpp:829

ERROR:CRASH: 12 0x7FF76ADD2000 dmGameObject::SpawnInternal D:\a\defold\defold\engine\gameobject\src\gameobject\gameobject.cpp:1172

ERROR:CRASH: 13 0x7FF76ADCAA70 dmGameObject::Spawn D:\a\defold\defold\engine\gameobject\src\gameobject\gameobject.cpp:1628

ERROR:CRASH: 14 0x7FF76AF3E390 dmGameSystem::FactoryComp_Create D:\a\defold\defold\engine\gamesys\src\gamesys\scripts\script_factory.cpp:344

ERROR:CRASH: 15 0x7FF76AD45E0E lj_BC_FUNCC <unknown>:0

ERROR:CRASH: 16 0x7FF76AD86080 lua_pcall <unknown>:0

ERROR:CRASH: 17 0x7FF76ADBA590 dmScript::PCallInternal D:\a\defold\defold\engine\script\src\script.cpp:1386

ERROR:CRASH: 18 0x7FF76ADB72C0 dmScript::InvokeCallback D:\a\defold\defold\engine\script\src\script.cpp:1778

ERROR:CRASH: 19 0x7FF76AE6E650 dmScript::LuaTimerCallback D:\a\defold\defold\engine\script\src\script_timer.cpp:517

ERROR:CRASH: 20 0x7FF76AE6D1A0 dmScript::UpdateTimers D:\a\defold\defold\engine\script\src\script_timer.cpp:228

ERROR:CRASH: 21 0x7FF76AE6D140 dmScript::TimerUpdateScriptWorld D:\a\defold\defold\engine\script\src\script_timer.cpp:460

ERROR:CRASH: 22 0x7FF76ADB61D0 dmScript::UpdateScriptWorld D:\a\defold\defold\engine\script\src\script.cpp:1125

ERROR:CRASH: 23 0x7FF76ADF6CB0 dmGameObject::CompScriptUpdate D:\a\defold\defold\engine\gameobject\src\gameobject\comp_script.cpp:254

ERROR:CRASH: 24 0x7FF76ADD5460 dmGameObject::Update D:\a\defold\defold\engine\gameobject\src\gameobject\gameobject.cpp:2572

ERROR:CRASH: 25 0x7FF76AE963A0 dmGameSystem::CompCollectionProxyUpdate D:\a\defold\defold\engine\gamesys\src\gamesys\components\comp_collection_proxy.cpp:299

ERROR:CRASH: 26 0x7FF76ADD5460 dmGameObject::Update D:\a\defold\defold\engine\gameobject\src\gameobject\gameobject.cpp:2572

ERROR:CRASH: 27 0x7FF76AE41E70 dmEngine::StepFrame D:\a\defold\defold\engine\engine\src\engine.cpp:1570

ERROR:CRASH: 28 0x7FF76AE3D0A0 dmEngineUpdate D:\a\defold\defold\engine\engine\src\engine.cpp:2098

ERROR:CRASH: 29 0x7FF76AE42890 dmEngine::RunLoop D:\a\defold\defold\engine\engine\src\engine_loop.cpp:83

ERROR:CRASH: 30 0x7FF76AD7C3B0 engine_main D:\a\defold\defold\engine\engine\src\engine_main.cpp:148

ERROR:CRASH: 31 0x7FF76B007194 __scrt_common_main_seh d:\agent\_work\4\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288

ERROR:CRASH: 32 0x7FFF50EB5590 BaseThreadInitThunk <unknown>:0

ERROR:CRASH: 33 0x7FFF51B84830 RtlUserThreadStart <unknown>:0

Trace 5 looks like the culprit. It fails an assert in ComputerCentroid. I guess this is saying the computed area of the collision shape is less than some minimum value, however the two collision objects attached to that game object are [ w = 8, h = 8, d = 1 ] and [ w = 24, h = 24, d = 1 ]. If I delete just one of these collisionobjects, the crash still occurs. If I delete both of these collisionobjects, the crash does not occur. I tried deleting those collisionobject files and remaking them, deleting the game object file and remaking it, and changing the shape dimensions, however none of those fixed it.

Edit: I also tried moving the factory components to another url which did not help. Interestingly, I tried spawning any other game object from factories, but apparently they are all failing.

d954mas · January 31, 2023, 7:46pm

Try to change physics scale. Looks like default scale is too small.

More info about box2d units.
https://box2d.org/documentation/index.html#autotoc_md17

WhiteBoxDev · January 31, 2023, 7:49pm

Scale 1.0 has worked until now, so I don’t think that is the issue. (But to check I made it very big and very small but no change.)

d954mas · January 31, 2023, 7:52pm

Hmm scale 1 is ok for bodies with size 8,1,24.
I think default value was smaller:)

aglitchman · January 31, 2023, 8:20pm

Hm. The scale of the game object containing (or spawning? I’m not sure) the factory is used by default. Is it super small like 0.00001? I bet on this, let’s double-check it.

d954mas · January 31, 2023, 8:37pm

Maybe something with shape or object rotation?

WhiteBoxDev · January 31, 2023, 9:55pm

Ah, yes I must have accidentally set the parent game object’s scale to 0.000001 when I was moving things around in the collection. Sometimes the editor starts out in scale mode instead of translate mode.

Thanks everyone. Solved.