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Crash when rending animation w/simple physics sim #94235

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opened 2021-12-18 21:56:37 +01:00 by Mike Nibeck · 12 comments
Mike Nibeck commented 2021-12-18 21:56:37 +01:00
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System Information
Operating system: macOS-12.0.1-x86_64-i386-64bit 64 Bits
Graphics card: Apple M1 Apple 4.1 Metal - 76.1

Blender Version
Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: f1cca30557
Worked: Spinning beach ball in 3.1 Alpha

Short description of error
When selecting "Render Animation", the Rendering window starts to draw, and then the app crashes.

Exact steps for others to reproduce the error
File attached. Just load and Select Render Animation.simple-physics-crash.blend

**System Information** Operating system: macOS-12.0.1-x86_64-i386-64bit 64 Bits Graphics card: Apple M1 Apple 4.1 Metal - 76.1 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `f1cca30557` Worked: Spinning beach ball in 3.1 Alpha **Short description of error** When selecting "Render Animation", the Rendering window starts to draw, and then the app crashes. **Exact steps for others to reproduce the error** File attached. Just load and Select Render Animation.[simple-physics-crash.blend](https://archive.blender.org/developer/F12761896/simple-physics-crash.blend)
Mike Nibeck commented 2021-12-18 21:56:37 +01:00
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Added subscriber: @nibeck

Added subscriber: @nibeck
Richard Antalik commented 2021-12-22 09:15:56 +01:00
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Added subscriber: @iss

Added subscriber: @iss
Richard Antalik commented 2021-12-22 09:15:56 +01:00
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Changed status from 'Needs Triage' to: 'Needs User Info'

Changed status from 'Needs Triage' to: 'Needs User Info'
Richard Antalik commented 2021-12-22 09:15:56 +01:00
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I wasn't able to reproduce crash. Can you upload crash report?

I wasn't able to reproduce crash. Can you upload crash report?
Mike Nibeck commented 2021-12-22 14:33:55 +01:00
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Blender-2021-12-22-083119.ips

Crash log attacherd.

[Blender-2021-12-22-083119.ips](https://archive.blender.org/developer/F12771831/Blender-2021-12-22-083119.ips) Crash log attacherd.
Richard Antalik commented 2021-12-23 04:09:09 +01:00
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Don't see anything obvious in log. But I have noticed that simulation was not baked. Can you check if you get crash when you bake all dynamics? This has to be done before rendering anyway.

Don't see anything obvious in log. But I have noticed that simulation was not baked. Can you check if you get crash when you bake all dynamics? This has to be done before rendering anyway.
Mike Nibeck commented 2021-12-23 15:03:58 +01:00
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That did it. No crash after Baking. I'm new to Blender, didn't realize I needed to Bake first.

Thank!

That did it. No crash after Baking. I'm new to Blender, didn't realize I needed to Bake first. Thank!
Richard Antalik commented 2021-12-27 15:40:39 +01:00
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Added subscriber: @mano-wii

Added subscriber: @mano-wii
Richard Antalik commented 2021-12-27 15:40:39 +01:00
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It's still not great it crashes though. @mano-wii Can you reproduce this?

It's still not great it crashes though. @mano-wii Can you reproduce this?
Germano Cavalcante commented 2022-01-21 23:21:38 +01:00
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Changed status from 'Needs User Info' to: 'Confirmed'

Changed status from 'Needs User Info' to: 'Confirmed'
Germano Cavalcante commented 2022-01-21 23:21:38 +01:00
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I can confirm the crash, it is related to RigidBody.

btBroadphaseProxy::getUid() const (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btBroadphaseProxy.h:113)
btHashedOverlappingPairCache::removeOverlappingPair(btBroadphaseProxy*, btBroadphaseProxy*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.cpp:297)
btHashedOverlappingPairCache::processAllOverlappingPairs(btOverlapCallback*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.cpp:343)
btHashedOverlappingPairCache::removeOverlappingPairsContainingProxy(btBroadphaseProxy*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.cpp:99)
btDbvtBroadphase::destroyProxy(btBroadphaseProxy*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btDbvtBroadphase.cpp:214)
btCollisionWorld::removeCollisionObject(btCollisionObject*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp:251)
rigidbody_validate_sim_object (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/rigidbody.c:821)
rigidbody_update_simulation (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/rigidbody.c:0)
BKE_rigidbody_do_simulation (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/rigidbody.c:2241)

std::__1::__function::__value_func<void (Depsgraph*)>::operator()(Depsgraph*&&) const (/Users/germanocavalcante/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/functional:1885)
std::__1::function<void (Depsgraph*)>::operator()(Depsgraph*) const (/Users/germanocavalcante/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/functional:2560)

blender::deg::(anonymous namespace)::evaluate_node(blender::deg::(anonymous namespace)::DepsgraphEvalState const*, blender::deg::OperationNode*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/eval/deg_eval.cc:118)
blender::deg::(anonymous namespace)::deg_task_run_func(TaskPool*, void*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/eval/deg_eval.cc:129)
Task::operator()() const (/Users/germanocavalcante/blender-git/blender/source/blender/blenlib/intern/task_pool.cc:178)
tbb::internal::function_task<Task>::execute() (/Users/germanocavalcante/blender-git/lib/darwin_arm64/tbb/include/tbb/task.h:1059)

tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::process_bypass_loop(tbb::internal::context_guard_helper<false>&, tbb::task*, long) (@tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::process_bypass_loop(tbb::internal::context_guard_helper<false>&, tbb::task*, long):113)
tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::local_wait_for_all(tbb::task&, tbb::task*) (@tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::local_wait_for_all(tbb::task&, tbb::task*):49)
tbb::internal::task_group_base::wait() (@tbb::internal::task_group_base::wait():13)

tbb_task_pool_work_and_wait(TaskPool*) (/Users/germanocavalcante/blender-git/blender/source/blender/blenlib/intern/task_pool.cc:251)
::BLI_task_pool_work_and_wait(TaskPool *) (/Users/germanocavalcante/blender-git/blender/source/blender/blenlib/intern/task_pool.cc:500)
blender::deg::deg_evaluate_on_refresh(blender::deg::Depsgraph*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/eval/deg_eval.cc:400)
deg_flush_updates_and_refresh(blender::deg::Depsgraph*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/depsgraph_eval.cc:60)
scene_graph_update_tagged (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/scene.c:2582)
BKE_scene_graph_update_tagged (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/scene.c:2631)
wm_event_do_depsgraph (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:384)
wm_event_do_refresh_wm_and_depsgraph (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:406)
wm_event_do_notifiers (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:616)
ghost_event_proc (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_window.c:1317)
GHOST_CallbackEventConsumer::processEvent(GHOST_IEvent*) (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_CallbackEventConsumer.cpp:41)
GHOST_EventManager::dispatchEvent(GHOST_IEvent*) (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_EventManager.cpp:84)
GHOST_EventManager::dispatchEvent() (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_EventManager.cpp:94)
GHOST_EventManager::dispatchEvents() (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_EventManager.cpp:100)
GHOST_System::dispatchEvents() (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_System.cpp:218)
wm_window_process_events (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_window.c:1523)
WM_main (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm.c:636)
main (/Users/germanocavalcante/blender-git/blender/source/creator/creator.c:560)
start (@start:133)

Thread 0::  Dispatch queue: com.apple.main-thread
0   Blender                       	       0x1014d8198 rbFilterCallback::needBroadphaseCollision(btBroadphaseProxy*, btBroadphaseProxy*) const + 48
1   Blender                       	       0x105504cb4 btHashedOverlappingPairCache::addOverlappingPair(btBroadphaseProxy*, btBroadphaseProxy*) + 40
2   Blender                       	       0x1055043e8 btDbvtTreeCollider::Process(btDbvtNode const*, btDbvtNode const*) + 52
3   Blender                       	       0x105503b50 btDbvt::collideTV(btDbvtNode const*, btDbvtAabbMm const&, btDbvt::ICollide&) const + 128
4   Blender                       	       0x105502f28 btDbvtBroadphase::createProxy(btVector3 const&, btVector3 const&, int, void*, int, int, btDispatcher*) + 252
5   Blender                       	       0x105512388 btCollisionWorld::addCollisionObject(btCollisionObject*, int, int) + 356
6   Blender                       	       0x100540510 rigidbody_validate_sim_object + 612
7   Blender                       	       0x10053fccc rigidbody_update_simulation + 496
8   Blender                       	       0x10053fa70 BKE_rigidbody_rebuild_world + 228
9   Blender                       	       0x1008b4f70 blender::deg::(anonymous namespace)::deg_task_run_func(TaskPool*, void*) + 140
10  Blender                       	       0x107495fc8 tbb::internal::function_task<Task>::execute() + 24
11  Blender                       	       0x1007a9278 tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::process_bypass_loop(tbb::internal::context_guard_helper<false>&, tbb::task*, long) + 440
12  Blender                       	       0x1007a8928 tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::local_wait_for_all(tbb::task&, tbb::task*) + 184
13  Blender                       	       0x101b50ee0 tbb::internal::task_group_base::wait() + 40
14  Blender                       	       0x10749615c BLI_task_pool_work_and_wait + 392
15  Blender                       	       0x1008b4c18 blender::deg::deg_evaluate_on_refresh(blender::deg::Depsgraph*) + 572
16  Blender                       	       0x1005459c4 scene_graph_update_tagged + 364
17  Blender                       	       0x1007b2f18 wm_event_do_depsgraph + 160
18  Blender                       	       0x1007b2fdc wm_event_do_refresh_wm_and_depsgraph + 44
19  Blender                       	       0x1007b3610 wm_event_do_notifiers + 1476
20  Blender                       	       0x1007ada4c WM_main + 44
21  Blender                       	       0x100334d7c main + 868
22  dyld                          	       0x1111110f4 start + 520
I can confirm the crash, it is related to RigidBody. ```lines=20 btBroadphaseProxy::getUid() const (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btBroadphaseProxy.h:113) btHashedOverlappingPairCache::removeOverlappingPair(btBroadphaseProxy*, btBroadphaseProxy*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.cpp:297) btHashedOverlappingPairCache::processAllOverlappingPairs(btOverlapCallback*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.cpp:343) btHashedOverlappingPairCache::removeOverlappingPairsContainingProxy(btBroadphaseProxy*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.cpp:99) btDbvtBroadphase::destroyProxy(btBroadphaseProxy*, btDispatcher*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/BroadphaseCollision/btDbvtBroadphase.cpp:214) btCollisionWorld::removeCollisionObject(btCollisionObject*) (/Users/germanocavalcante/blender-git/blender/extern/bullet2/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp:251) rigidbody_validate_sim_object (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/rigidbody.c:821) rigidbody_update_simulation (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/rigidbody.c:0) BKE_rigidbody_do_simulation (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/rigidbody.c:2241) std::__1::__function::__value_func<void (Depsgraph*)>::operator()(Depsgraph*&&) const (/Users/germanocavalcante/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/functional:1885) std::__1::function<void (Depsgraph*)>::operator()(Depsgraph*) const (/Users/germanocavalcante/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/include/c++/v1/functional:2560) blender::deg::(anonymous namespace)::evaluate_node(blender::deg::(anonymous namespace)::DepsgraphEvalState const*, blender::deg::OperationNode*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/eval/deg_eval.cc:118) blender::deg::(anonymous namespace)::deg_task_run_func(TaskPool*, void*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/eval/deg_eval.cc:129) Task::operator()() const (/Users/germanocavalcante/blender-git/blender/source/blender/blenlib/intern/task_pool.cc:178) tbb::internal::function_task<Task>::execute() (/Users/germanocavalcante/blender-git/lib/darwin_arm64/tbb/include/tbb/task.h:1059) tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::process_bypass_loop(tbb::internal::context_guard_helper<false>&, tbb::task*, long) (@tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::process_bypass_loop(tbb::internal::context_guard_helper<false>&, tbb::task*, long):113) tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::local_wait_for_all(tbb::task&, tbb::task*) (@tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::local_wait_for_all(tbb::task&, tbb::task*):49) tbb::internal::task_group_base::wait() (@tbb::internal::task_group_base::wait():13) tbb_task_pool_work_and_wait(TaskPool*) (/Users/germanocavalcante/blender-git/blender/source/blender/blenlib/intern/task_pool.cc:251) ::BLI_task_pool_work_and_wait(TaskPool *) (/Users/germanocavalcante/blender-git/blender/source/blender/blenlib/intern/task_pool.cc:500) blender::deg::deg_evaluate_on_refresh(blender::deg::Depsgraph*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/eval/deg_eval.cc:400) deg_flush_updates_and_refresh(blender::deg::Depsgraph*) (/Users/germanocavalcante/blender-git/blender/source/blender/depsgraph/intern/depsgraph_eval.cc:60) scene_graph_update_tagged (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/scene.c:2582) BKE_scene_graph_update_tagged (/Users/germanocavalcante/blender-git/blender/source/blender/blenkernel/intern/scene.c:2631) wm_event_do_depsgraph (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:384) wm_event_do_refresh_wm_and_depsgraph (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:406) wm_event_do_notifiers (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:616) ghost_event_proc (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_window.c:1317) GHOST_CallbackEventConsumer::processEvent(GHOST_IEvent*) (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_CallbackEventConsumer.cpp:41) GHOST_EventManager::dispatchEvent(GHOST_IEvent*) (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_EventManager.cpp:84) GHOST_EventManager::dispatchEvent() (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_EventManager.cpp:94) GHOST_EventManager::dispatchEvents() (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_EventManager.cpp:100) GHOST_System::dispatchEvents() (/Users/germanocavalcante/blender-git/blender/intern/ghost/intern/GHOST_System.cpp:218) wm_window_process_events (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm_window.c:1523) WM_main (/Users/germanocavalcante/blender-git/blender/source/blender/windowmanager/intern/wm.c:636) main (/Users/germanocavalcante/blender-git/blender/source/creator/creator.c:560) start (@start:133) ``` ``` Thread 0:: Dispatch queue: com.apple.main-thread 0 Blender 0x1014d8198 rbFilterCallback::needBroadphaseCollision(btBroadphaseProxy*, btBroadphaseProxy*) const + 48 1 Blender 0x105504cb4 btHashedOverlappingPairCache::addOverlappingPair(btBroadphaseProxy*, btBroadphaseProxy*) + 40 2 Blender 0x1055043e8 btDbvtTreeCollider::Process(btDbvtNode const*, btDbvtNode const*) + 52 3 Blender 0x105503b50 btDbvt::collideTV(btDbvtNode const*, btDbvtAabbMm const&, btDbvt::ICollide&) const + 128 4 Blender 0x105502f28 btDbvtBroadphase::createProxy(btVector3 const&, btVector3 const&, int, void*, int, int, btDispatcher*) + 252 5 Blender 0x105512388 btCollisionWorld::addCollisionObject(btCollisionObject*, int, int) + 356 6 Blender 0x100540510 rigidbody_validate_sim_object + 612 7 Blender 0x10053fccc rigidbody_update_simulation + 496 8 Blender 0x10053fa70 BKE_rigidbody_rebuild_world + 228 9 Blender 0x1008b4f70 blender::deg::(anonymous namespace)::deg_task_run_func(TaskPool*, void*) + 140 10 Blender 0x107495fc8 tbb::internal::function_task<Task>::execute() + 24 11 Blender 0x1007a9278 tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::process_bypass_loop(tbb::internal::context_guard_helper<false>&, tbb::task*, long) + 440 12 Blender 0x1007a8928 tbb::internal::custom_scheduler<tbb::internal::IntelSchedulerTraits>::local_wait_for_all(tbb::task&, tbb::task*) + 184 13 Blender 0x101b50ee0 tbb::internal::task_group_base::wait() + 40 14 Blender 0x10749615c BLI_task_pool_work_and_wait + 392 15 Blender 0x1008b4c18 blender::deg::deg_evaluate_on_refresh(blender::deg::Depsgraph*) + 572 16 Blender 0x1005459c4 scene_graph_update_tagged + 364 17 Blender 0x1007b2f18 wm_event_do_depsgraph + 160 18 Blender 0x1007b2fdc wm_event_do_refresh_wm_and_depsgraph + 44 19 Blender 0x1007b3610 wm_event_do_notifiers + 1476 20 Blender 0x1007ada4c WM_main + 44 21 Blender 0x100334d7c main + 868 22 dyld 0x1111110f4 start + 520 ```
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Lukas Tönne commented 2023-04-03 14:43:36 +02:00
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The Bullet wrapper code is very unsafe wrt. pointer remapping and multithreading.

One issue is that the shape gets replaced and the internal pointer does not get updated. This could be fixed like so:

diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c
index b5509b1bfe2..74365ac3b36 100644
--- a/source/blender/blenkernel/intern/rigidbody.c
+++ b/source/blender/blenkernel/intern/rigidbody.c
@@ -599,6 +599,11 @@ static void rigidbody_validate_sim_shape(RigidBodyWorld *rbw, Object *ob, bool r
       RB_shape_delete(rbo->shared->physics_shape);
     }
     rbo->shared->physics_shape = new_shape;
+
+    /* Make sure the internal shape pointer is updated when the shape is changed */
+    if (rbo->shared->physics_object) {
+      RB_body_set_collision_shape(rbo->shared->physics_object, new_shape);
+    }
   }
 }

However, the thread safety issues are not so easily solved. It's hard to debug this stuff, so i'm not confident this can be solved completely. Your best bet is to bake the rigid body simulation, so that it doesn't even run during the rendering (Scene properties > Rigid Body World > Cache > Bake).

The Bullet wrapper code is very unsafe wrt. pointer remapping and multithreading. One issue is that the shape gets replaced and the internal pointer does not get updated. This could be fixed like so: ```diff diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c index b5509b1bfe2..74365ac3b36 100644 --- a/source/blender/blenkernel/intern/rigidbody.c +++ b/source/blender/blenkernel/intern/rigidbody.c @@ -599,6 +599,11 @@ static void rigidbody_validate_sim_shape(RigidBodyWorld *rbw, Object *ob, bool r RB_shape_delete(rbo->shared->physics_shape); } rbo->shared->physics_shape = new_shape; + + /* Make sure the internal shape pointer is updated when the shape is changed */ + if (rbo->shared->physics_object) { + RB_body_set_collision_shape(rbo->shared->physics_object, new_shape); + } } } ``` However, the thread safety issues are not so easily solved. It's hard to debug this stuff, so i'm not confident this can be solved completely. Your best bet is to bake the rigid body simulation, so that it doesn't even run during the rendering (Scene properties > Rigid Body World > Cache > Bake).
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