Poly Hammer
Undo/Ctrl+Z Crash in Character Control Rig #25
Replies: 12 comments 10 replies
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ExceptionCode : EXCEPTION_ACCESS_VIOLATION (0xc0000005) |
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Running Blender with all of the evaluations running is laggy and crashes. |
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Shutting body evaluations off provides smooth viewport and no undo crashes. |
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Hi @orfiko can you do a few things for me:
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Hmm ok, I cannot reproduce the crash like that. It is works for me with the body evaluations. Can you reset Blender to defaults? This will disable all non-default addons. Then enable Character DNA and Character Control Rig, then save your startup file. Shutdown Blender. Start Blender. Check and verify only Character DNA and Character Control Rig are enabled. Import the Ada DNA. Generate the Control Rig and pose the body. If still crashing, paste the contents of the Blender crash log here. Thanks! This should rule out any collisions with other addons. Also your Blender python environment hasn't been modified correct? (like another addon installed something to your system?) If that is the case, uninstalling Blender and re-installing will help rule that out too. |
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Do I even need body evaluations for something? What are they used for? |
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Yea claude probably won't be able to find the issue because both Blender and the RigLogic module are not compiled with debug symbols. I would try cleaning your environment like mentioned above. As far as what the body evaluations do is explained here. If you don't want an exact match with the correctives in Unreal and your deformations don't look "weird" (at least in the shots/animation you are creating) then you don't "need" it, at least for the rest of the addon to function. (minus the RBF Editor) |
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Ran Blender with factory settings command with cmd. Loaded Ada, enabled body evaluations, laggy viewport, undo command and then crash. Blender 5.1.2, Commit date: 2026-05-18 13:43, Hash ec6e62d40fa9bpy.ops.object.posemode_toggle() # Operator backtraceException Record: ExceptionCode : EXCEPTION_ACCESS_VIOLATION (0xc0000005) Stack trace: Threads: Thread : 00006780 Thread : 0000ae1c Thread : 000081d4 Thread : 00008588 Thread : 0000a690 Thread : 0000664c Thread : 00007f08 Thread : 00005d6c Thread : 00005050 Thread : 0000ad64 Thread : 00001964 Thread : 00007a88 Thread : 000074ec Thread : 0000b5b4 Thread : 000095d8 Thread : 00003138 Thread : 00008994 Thread : 0000b1f4 Thread : 00004df0 Thread : 0000ac4c Thread : 00005ce0 Thread : 0000b1f0 Thread : 000082e8 Thread : 00001d3c Thread : 000021c0 Thread : 0000b9a8 Thread : 000086c0 Thread : 00002750 Thread : 00007db0 Thread : 00003a40 Thread : 000079d8 Thread : 00006a0c Thread : 00009e9c Thread : 00001d98 Thread : 00009514 Thread : 0000ae78 Thread : 00009390 Thread : 00005aa8 Thread : 0000aae0 Thread : 000045f4 Thread : 00000260 Thread : 000075e8 Thread : 000086bc Thread : 00008f64 Thread : 0000a944 Thread : 00007434 Thread : 00003acc Thread : 000094f4 Thread : 000018f8 Thread : 0000511c Thread : 00007ff8 Thread : 00009fd0 Thread : 00006908 Thread : 0000a240 Thread : 00008114 Thread : 00009630 Thread : 00007670 Thread : 0000b164 Thread : 00008de8 Thread : 00007c1c Thread : 00007c10 Thread : 0000746c Thread : 0000433c Thread : 0000a198 Thread : 0000b168 Thread : 0000a81c Thread : 000078ac Thread : 00001720 Thread : 0000b044 Thread : 0000854c Thread : 00009f30 Thread : 00008860 Thread : 000009f4 Thread : 00009bd0 Thread : 00007a74 Thread : 00004a18 Thread : 000089a0 Thread : 000085b4 Thread : 000075ec Thread : 0000a728 Thread : 0000a89c Thread : 0000b6d4 Thread : 0000bad4 Thread : 000095b8 Thread : 000044cc Thread : 00001708 Thread : 0000904c Thread : 00008b64 Thread : 00001a80 Thread : 00006648 Thread : 00003124 Thread : 00007fe8 Thread : 00007ab8 Thread : 00002fc8 Thread : 00003d48 Thread : 000076f4 Thread : 00007c88 Thread : 000083bc Thread : 00009554 Thread : 0000b744 Thread : 0000b4ec Thread : 000054f4 Thread : 000065a8 Thread : 00001054 Thread : 00008c0c Thread : 00009430 Thread : 000092d8 Thread : 0000adfc Thread : 0000b7f8 Thread : 000095a0 Loaded Modules : Python backtraceFile "C:\Users\XXX\AppData\Roaming\Blender Foundation\Blender\5.1\extensions\user_default\character_dna\rig_instance.py", line 806 in head_initialized |
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Found something crucial here. Factory blender prompted me to either run or ignore scripts on loading of project. I think there's something with how it auto-runs the script? I also randomly noticed in the crashing hours of the project that when the evaluation was on and I had made a slight pose change, my Cycles viewport render would refresh every second. So it has to be something with how the script.py runs. |
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Exporting .abc from Blender to Houdini has also some issues. While body animation has correct keyframes, facial animation looks stepped. |
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Scrolling one frame back and forth in the head rig animation produces weird animation inbetween articats, like a slight delay before the pose snaps to its place. Claude reports: "That's the smoking gun. A slight delay before the pose settles means the head rig has a depsgraph evaluation dependency cycle or lag — it needs more than one evaluation pass to reach its final state on each frame. This is a known issue with complex driver chains. The evaluation order is: Face GUI bones → drivers → Head rig bones → skinning → Head mesh But if any part of that chain has a circular dependency or requires multiple passes to resolve, Blender needs to evaluate the frame twice before the head mesh reaches its correct position. In the viewport you see this as a one-frame lag when scrubbing. During ABC or USD export, the exporter captures the mesh after only one evaluation pass — so it captures the head mesh in its intermediate state, not its final settled state. Hence the stepping. This is a Polyhammer bug — their head rig setup has an evaluation dependency that requires multiple depsgraph passes to resolve, which breaks any frame-by-frame export. Proof test: Go to any frame This is worth reporting to them with this exact description." |
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Okay. We've exhausted every native approach for the head stepping. The root cause is confirmed — it's the three-armature COPY_TRANSFORMS chain requiring multiple depsgraph evaluation passes that no export format can capture in a single pass. Polyhammer fixing their rig to evaluate in a single pass Sorry for the spam, I'm in a rush here and would like some feedback because I bought both the addons yesterday :) |
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I am continuing this thread because it's more than an undo bug. This is MAJOR issue. Some of us are not even looking sending back the Metahuman to Unreal, we want to render and animate in Blender. |
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This is an issue occurring for me as well. CTRL+Z causes a crash every single time. Just bought and installed it today. I'll run a test with a default Ada to see if the issue occurs but at this moment, the issue isn't a one-off. |
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I was able to trigger the crash as well. Let me do some further digging, but I should have a fix for this in the next release. |
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I'm running into the same issue. Every time I try to undo a pose in Blender, it crashes. |
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Hi, Recently got the app, but it seems unusable? I bring in the head.dna into blender, add the meta rig, add the controls, it all generates, but as soon as I move the rig on any control, on any frame, it becomes unresponsive. Same if I have auto keying on or off, or if i kill the rig, rebuild it, one touch and it dies. I'm hoping its me, cos I really need this to work for a job I'm doing, and I've come from Maya to Blender, but from what I can see, (And read here) its got issues. 1 I move any element of the control rig, it locks, and becomes unresponsive, meaning controls are undetectable And then....! For security reason, automatic execution of Python scripts in this file was disabled. Ive tried it both ways, leaving them off and then allowing them, and the file still seems to work. So, if this helps folks, great, Ill add more as I start using the app more n more, ta! |
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Ok thanks everyone for the reports! I just pushed the fix to 0.7.2 of Character DNA addon. Please note, Character DNA addon is where the problem was so that is what you have to update. Make sure to restart Blender after you update the addon. |
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While the rig is working fine (laggy, nevertheless) and I am able to move around the controllers and reset them if I want to, Blender 5.1.2 crashes always when I undo a pose step. Doesn't crash in Metahuman DNA Face Rig, only in Character Control Rig.
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