FBX file loses Animation take after save by Cheetah3d

BurningThumb · Sep 4, 2025

I have an FBX file that I want to modify and after doing so I found Unity3d no longer imports the first animation take.

To simplify testing, I just opened the fbx, then saved it under a new name using save as, and the first animation take was gone.

Any idea what is happening?

Cheetah3d 8.1.3
Unity3d 6000.2.0f1

frank beckmann · Sep 4, 2025

It´ll be there if you go File->Export->..."jas" - but Take "Recon_Tank_Rig|Drive" contains just 2 equal keyframes inside a length of 1/30 if this makes any sense.

BurningThumb · Sep 4, 2025

I did export it as .jas, same problem. I know the take only has 2 key frames (I did not create the file), and my next step was to add in a few more key frames to see if that will solve it. I just think its a Cheetah3d bug since the original .fbx has no problems. Its only after I save it out of Cheetah3d that the take goes missing.

The attached screenshots are from the .jas

BurningThumb · Sep 4, 2025

These images are from the original .fbx,

Notice that Cheetah3d still sees the first take after saving, its only the import into Unity that is losing it.

frank beckmann · Sep 4, 2025

I changed the length of the first Take to "0,5" - exported as ".jas" and imported and it´s there:

BurningThumb · Sep 4, 2025

So, yes, adding a 3rd key frame resulted in the take showing up in Unity. I'll try just changing its length.

BurningThumb · Sep 4, 2025

Well I changed the length to 1.0 and then was scrubbing in the animation window and I got this crash:

Code:

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               Cheetah3D [96428]
Path:                  /Applications/Cheetah3D.app/Contents/MacOS/Cheetah3D
Identifier:            de.wengenmayer.Cheetah3D
Version:               8.1.3 (8.1.3)
Code Type:             ARM-64 (Native)
Parent Process:        launchd [1]
User ID:               502

Date/Time:             2025-09-04 11:19:16.2147 -0700
OS Version:            macOS 15.6.1 (24G90)
Report Version:        12
Anonymous UUID:        F9B9EF39-4DD7-1C59-983A-C74E40441608

Sleep/Wake UUID:       671A4A51-31D3-4988-B6DC-D8DD21AF7908

Time Awake Since Boot: 1000000 seconds
Time Since Wake:       5388 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BREAKPOINT (SIGTRAP)
Exception Codes:       0x0000000000000001, 0x0000000189850628

Termination Reason:    Namespace SIGNAL, Code 5 Trace/BPT trap: 5
Terminating Process:   exc handler [96428]

Application Specific Backtrace 0:
0   CoreFoundation                      0x00000001856cbae0 __exceptionPreprocess + 176
1   libobjc.A.dylib                     0x000000018518eb90 objc_exception_throw + 88
2   CoreFoundation                      0x00000001856cb9d0 +[NSException exceptionWithName:reason:userInfo:] + 0
3   AppKit                              0x0000000189699590 -[NSBezierPath(NSBezierPathDevicePrimitives) _deviceMoveToPoint:] + 104
4   Cheetah3D                           0x0000000102fc5f2c Cheetah3D + 220972
5   AppKit                              0x0000000189690ca8 _NSViewDrawRect + 160
6   AppKit                              0x000000018a0a7118 -[NSView _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:] + 1084
7   AppKit                              0x000000018969069c -[NSView(NSLayerKitGlue) _drawViewBackingLayer:inContext:drawingHandler:] + 536
8   AppKit                              0x0000000189d4db90 -[NSViewBackingLayer drawInContext:] + 56
9   AppKit                              0x00000001899c3a7c block_destroy_helper.24 + 3444
10  AppKit                              0x00000001899abfa0 __getCGDisplayListGetHashSymbolLoc_block_invoke + 16160
11  AppKit                              0x00000001899a7114 _NSCGDisplayListGetHash + 1744
12  AppKit                              0x00000001899abc70 __getCGDisplayListGetHashSymbolLoc_block_invoke + 15344
13  AppKit                              0x00000001899a9674 __getCGDisplayListGetHashSymbolLoc_block_invoke + 5620
14  AppKit                              0x0000000189a34538 block_destroy_helper.34 + 9484
15  AppKit                              0x0000000189a34ba0 block_destroy_helper.34 + 11124
16  AppKit                              0x0000000189d4d7b0 -[NSViewBackingLayer display] + 1280
17  QuartzCore                          0x000000018e6d80b4 _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 748
18  QuartzCore                          0x000000018e86c464 _ZN2CA7Context18commit_transactionEPNS_11TransactionEdPd + 492
19  QuartzCore                          0x000000018e6b93a8 _ZN2CA11Transaction6commitEv + 644
20  AppKit                              0x000000018969ffb4 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 272
21  AppKit                              0x000000018a0e9978 ___NSRunLoopObserverCreateWithHandler_block_invoke + 64
22  CoreFoundation                      0x0000000185659ed8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
23  CoreFoundation                      0x0000000185659dc0 __CFRunLoopDoObservers + 536
24  CoreFoundation                      0x0000000185659430 __CFRunLoopRun + 784
25  CoreFoundation                      0x0000000185658a98 CFRunLoopRunSpecific + 572
26  HIToolbox                           0x00000001910fb27c RunCurrentEventLoopInMode + 324
27  HIToolbox                           0x00000001910fe4e8 ReceiveNextEventCommon + 676
28  HIToolbox                           0x0000000191289484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
29  AppKit                              0x000000018957da34 _DPSNextEvent + 684
30  AppKit                              0x0000000189f1c940 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
31  AppKit                              0x0000000189570be4 -[NSApplication run] + 480
32  AppKit                              0x00000001895472dc NSApplicationMain + 880
33  dyld                                0x00000001851ceb98 start + 6076


Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   AppKit                                   0x189850628 -[NSApplication _crashOnException:] + 256
1   AppKit                                   0x1896a0128 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 644
2   AppKit                                   0x18a0e9978 ___NSRunLoopObserverCreateWithHandler_block_invoke + 64
3   CoreFoundation                           0x185659ed8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
4   CoreFoundation                           0x185659dc0 __CFRunLoopDoObservers + 536
5   CoreFoundation                           0x185659430 __CFRunLoopRun + 784
6   CoreFoundation                           0x185658a98 CFRunLoopRunSpecific + 572
7   HIToolbox                                0x1910fb27c RunCurrentEventLoopInMode + 324
8   HIToolbox                                0x1910fe4e8 ReceiveNextEventCommon + 676
9   HIToolbox                                0x191289484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
10  AppKit                                   0x18957da34 _DPSNextEvent + 684
11  AppKit                                   0x189f1c940 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
12  AppKit                                   0x189570be4 -[NSApplication run] + 480
13  AppKit                                   0x1895472dc NSApplicationMain + 880
14  dyld                                     0x1851ceb98 start + 6076

Thread 1:: com.apple.NSEventThread
0   libsystem_kernel.dylib                   0x18552dc34 mach_msg2_trap + 8
1   libsystem_kernel.dylib                   0x1855403a0 mach_msg2_internal + 76
2   libsystem_kernel.dylib                   0x185536764 mach_msg_overwrite + 484
3   libsystem_kernel.dylib                   0x18552dfa8 mach_msg + 24
4   CoreFoundation                           0x18565acbc __CFRunLoopServiceMachPort + 160
5   CoreFoundation                           0x1856595d8 __CFRunLoopRun + 1208
6   CoreFoundation                           0x185658a98 CFRunLoopRunSpecific + 572
7   AppKit                                   0x1896a178c _NSEventThread + 140
8   libsystem_pthread.dylib                  0x18556fc0c _pthread_start + 136
9   libsystem_pthread.dylib                  0x18556ab80 thread_start + 8

Thread 2:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 4:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 5:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 6:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 7:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 8:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 9:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 10:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 11:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x000000013c222000   x1: 0x000000013c10dd8c   x2: 0xffffffffffffffeb   x3: 0x000000013c222d6b
    x4: 0xffffffffffeeb001   x5: 0x0000000000000020   x6: 0x000000013c222000   x7: 0x0000000000000dab
    x8: 0x00000001f100d000   x9: 0x3024f86ec2a700a9  x10: 0x3024f86ec2a700a9  x11: 0x00000000000000ff
   x12: 0x0000000000000029  x13: 0x000000013c252280  x14: 0x01000001f351c6e9  x15: 0x00000001f351c6e8
   x16: 0x00000001855a92c0  x17: 0x00000001f45582e8  x18: 0x0000000000000000  x19: 0x000000013b887960
   x20: 0x000000013af15590  x21: 0x0000179be8524f6f  x22: 0x000000013b00c050  x23: 0x000000016ce6df80
   x24: 0x0000000118b6a550  x25: 0x000000013b8f78b0  x26: 0x000000018565a448  x27: 0x000000013b00c048
   x28: 0x0000000000000001   fp: 0x000000016ce6ddf0   lr: 0x0000000189850620
    sp: 0x000000016ce6ddb0   pc: 0x0000000189850628 cpsr: 0x60001000
   far: 0x0000000000000000  esr: 0xf2000001 (Breakpoint) brk 1

...

richardbarryrichard · Nov 4, 2025

BurningThumb said:

Well I changed the length to 1.0 and then was scrubbing in the animation window and I got this crash:

Code:

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               Cheetah3D [96428]
Path:                  /Applications/Cheetah3D.app/Contents/MacOS/Cheetah3D
Identifier:            de.wengenmayer.Cheetah3D
Version:               8.1.3 (8.1.3)
Code Type:             ARM-64 (Native)
Parent Process:        launchd [1]
User ID:               502

Date/Time:             2025-09-04 11:19:16.2147 -0700
OS Version:            macOS 15.6.1 (24G90)
Report Version:        12
Anonymous UUID:        F9B9EF39-4DD7-1C59-983A-C74E40441608

Sleep/Wake UUID:       671A4A51-31D3-4988-B6DC-D8DD21AF7908

Time Awake Since Boot: 1000000 seconds
Time Since Wake:       5388 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BREAKPOINT (SIGTRAP)
Exception Codes:       0x0000000000000001, 0x0000000189850628

Termination Reason:    Namespace SIGNAL, Code 5 Trace/BPT trap: 5
Terminating Process:   exc handler [96428]

Application Specific Backtrace 0:
0   CoreFoundation                      0x00000001856cbae0 __exceptionPreprocess + 176
1   libobjc.A.dylib                     0x000000018518eb90 objc_exception_throw + 88
2   CoreFoundation                      0x00000001856cb9d0 +[NSException exceptionWithName:reason:userInfo:] + 0
3   AppKit                              0x0000000189699590 -[NSBezierPath(NSBezierPathDevicePrimitives) _deviceMoveToPoint:] + 104
4   Cheetah3D                           0x0000000102fc5f2c Cheetah3D + 220972
5   AppKit                              0x0000000189690ca8 _NSViewDrawRect + 160
6   AppKit                              0x000000018a0a7118 -[NSView _recursive:displayRectIgnoringOpacity:inContext:stopAtLayerBackedViews:] + 1084
7   AppKit                              0x000000018969069c -[NSView(NSLayerKitGlue) _drawViewBackingLayer:inContext:drawingHandler:] + 536
8   AppKit                              0x0000000189d4db90 -[NSViewBackingLayer drawInContext:] + 56
9   AppKit                              0x00000001899c3a7c block_destroy_helper.24 + 3444
10  AppKit                              0x00000001899abfa0 __getCGDisplayListGetHashSymbolLoc_block_invoke + 16160
11  AppKit                              0x00000001899a7114 _NSCGDisplayListGetHash + 1744
12  AppKit                              0x00000001899abc70 __getCGDisplayListGetHashSymbolLoc_block_invoke + 15344
13  AppKit                              0x00000001899a9674 __getCGDisplayListGetHashSymbolLoc_block_invoke + 5620
14  AppKit                              0x0000000189a34538 block_destroy_helper.34 + 9484
15  AppKit                              0x0000000189a34ba0 block_destroy_helper.34 + 11124
16  AppKit                              0x0000000189d4d7b0 -[NSViewBackingLayer display] + 1280
17  QuartzCore                          0x000000018e6d80b4 _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 748
18  QuartzCore                          0x000000018e86c464 _ZN2CA7Context18commit_transactionEPNS_11TransactionEdPd + 492
19  QuartzCore                          0x000000018e6b93a8 _ZN2CA11Transaction6commitEv + 644
20  AppKit                              0x000000018969ffb4 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 272
21  AppKit                              0x000000018a0e9978 ___NSRunLoopObserverCreateWithHandler_block_invoke + 64
22  CoreFoundation                      0x0000000185659ed8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
23  CoreFoundation                      0x0000000185659dc0 __CFRunLoopDoObservers + 536
24  CoreFoundation                      0x0000000185659430 __CFRunLoopRun + 784
25  CoreFoundation                      0x0000000185658a98 CFRunLoopRunSpecific + 572
26  HIToolbox                           0x00000001910fb27c RunCurrentEventLoopInMode + 324
27  HIToolbox                           0x00000001910fe4e8 ReceiveNextEventCommon + 676
28  HIToolbox                           0x0000000191289484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
29  AppKit                              0x000000018957da34 _DPSNextEvent + 684
30  AppKit                              0x0000000189f1c940 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
31  AppKit                              0x0000000189570be4 -[NSApplication run] + 480
32  AppKit                              0x00000001895472dc NSApplicationMain + 880
33  dyld                                0x00000001851ceb98 start + 6076


Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   AppKit                                   0x189850628 -[NSApplication _crashOnException:] + 256
1   AppKit                                   0x1896a0128 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 644
2   AppKit                                   0x18a0e9978 ___NSRunLoopObserverCreateWithHandler_block_invoke + 64
3   CoreFoundation                           0x185659ed8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
4   CoreFoundation                           0x185659dc0 __CFRunLoopDoObservers + 536
5   CoreFoundation                           0x185659430 __CFRunLoopRun + 784
6   CoreFoundation                           0x185658a98 CFRunLoopRunSpecific + 572
7   HIToolbox                                0x1910fb27c RunCurrentEventLoopInMode + 324
8   HIToolbox                                0x1910fe4e8 ReceiveNextEventCommon + 676
9   HIToolbox                                0x191289484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
10  AppKit                                   0x18957da34 _DPSNextEvent + 684
11  AppKit                                   0x189f1c940 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
12  AppKit                                   0x189570be4 -[NSApplication run] + 480
13  AppKit                                   0x1895472dc NSApplicationMain + 880
14  dyld                                     0x1851ceb98 start + 6076

Thread 1:: com.apple.NSEventThread
0   libsystem_kernel.dylib                   0x18552dc34 mach_msg2_trap + 8
1   libsystem_kernel.dylib                   0x1855403a0 mach_msg2_internal + 76
2   libsystem_kernel.dylib                   0x185536764 mach_msg_overwrite + 484
3   libsystem_kernel.dylib                   0x18552dfa8 mach_msg + 24
4   CoreFoundation                           0x18565acbc __CFRunLoopServiceMachPort + 160
5   CoreFoundation                           0x1856595d8 __CFRunLoopRun + 1208
6   CoreFoundation                           0x185658a98 CFRunLoopRunSpecific + 572
7   AppKit                                   0x1896a178c _NSEventThread + 140
8   libsystem_pthread.dylib                  0x18556fc0c _pthread_start + 136
9   libsystem_pthread.dylib                  0x18556ab80 thread_start + 8

Thread 2:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 4:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 5:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 6:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 7:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 8:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 9:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 10:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0

Thread 11:
0   libsystem_pthread.dylib                  0x18556ab6c start_wqthread + 0
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Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x000000013c222000   x1: 0x000000013c10dd8c   x2: 0xffffffffffffffeb   x3: 0x000000013c222d6b
    x4: 0xffffffffffeeb001   x5: 0x0000000000000020   x6: 0x000000013c222000   x7: 0x0000000000000dab
    x8: 0x00000001f100d000   x9: 0x3024f86ec2a700a9  x10: 0x3024f86ec2a700a9  x11: 0x00000000000000ff
   x12: 0x0000000000000029  x13: 0x000000013c252280  x14: 0x01000001f351c6e9  x15: 0x00000001f351c6e8
   x16: 0x00000001855a92c0  x17: 0x00000001f45582e8  x18: 0x0000000000000000  x19: 0x000000013b887960
   x20: 0x000000013af15590  x21: 0x0000179be8524f6f  x22: 0x000000013b00c050  x23: 0x000000016ce6df80
   x24: 0x0000000118b6a550  x25: 0x000000013b8f78b0  x26: 0x000000018565a448  x27: 0x000000013b00c048
   x28: 0x0000000000000001   fp: 0x000000016ce6ddf0   lr: 0x0000000189850620
    sp: 0x000000016ce6ddb0   pc: 0x0000000189850628 cpsr: 0x60001000
   far: 0x0000000000000000  esr: 0xf2000001 (Breakpoint) brk 1

...

Thanks for the info! That’s really helpful to know — I’ll check if the crash is related to the length change.

richardbarryrichard · Friday at 2:19 PM

BurningThumb said:
I have an FBX file that I want to modify and after doing so I found Unity3d no longer imports the first animation take.

To simplify testing, I just opened the fbx, then saved it under a new name using save as, and the first animation take was gone.

Any idea what is happening?

Cheetah3d 8.1.3
https://bizzonlinecasino.club/ Unity3d 6000.2.0f1

Yeah, this is a pretty common FBX quirk rather than anything you did wrong. Cheetah3D’s FBX exporter is known to drop or reorder animation takes when you re-save, and Unity will only import what’s explicitly written into the FBX after export — so if the first take isn’t re-exported, Unity never sees it.

In practice, opening and “Save As” can cause Cheetah3D to bake only the active or default take and discard the rest. Double-check that all animation takes are still present in Cheetah before export, and try exporting via Export FBX (not just Save As), with “All Animations / Takes” enabled. Some users also work around this by renaming or reordering takes so the desired one isn’t the first/default.

FBX file loses Animation take after save by Cheetah3d

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FBX file loses Animation take after save by Cheetah3d

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