# UE4.26 - Alembic/FBX animation caches not syncing up **URL:** \ **Category:** Character & Animation\ **Tags:** syncing, unreal-engine, FBX, Alembic, question\ **Created:** [December 20, 2020, 6:58pm UTC](https://forums.unrealengine.com/t/ue4-26-alembic-fbx-animation-caches-not-syncing-up/476189 "2020-12-20T18:58:58Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Jason\_Gagnon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Jason\_Gagnon](https://forums.unrealengine.com/u/Jason_Gagnon)\ **Post date:** [December 20, 2020, 6:58pm UTC](https://forums.unrealengine.com/t/ue4-26-alembic-fbx-animation-caches-not-syncing-up/476189/1 "2020-12-20T18:58:58Z")
Hey there, I’m struggling to get a match in the animation when importing an FBX and Alembic cache of the same animation from Maya. I’ve tried about everything I could, and based on searching around the forums it might still be a problem? In the example below, I’ve just animated a cube, and purposely put in keyframes that are close to each other, and some further away (can’t really limit what animators may do). You can see in the screengrab that the cubes break away from each other (this is frame 2 in the file). Green cube = Alembic, Blue cube = FBX ![325266-highresscreenshot00089.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/c/0/3c004af623640a26da0dd09e7ec6a7093c9085a7.jpeg) It appears to me the FBX cache is not correct. I’ve attempted to import by setting the custom sample rate to 25 and also tried leaving it at 0, but I get the same result. I’m currently working in 25fps, so I’ve made sure that the sequencer is set to 25fps, and when I export from Maya everything is 25fps as well, along with trying to set t.maxFPS to 25. I think this gets a bit worse once you start applying this to a character that is jumping around for example. The difference of the separation is much larger then what you see with the cubes. Here is a zip containing the maya file, along with the cached files in case anyone wants to have a play around. [alembic\_fbx\_cube][2] Any help would be greatly appreciated! Cheers, Jason ---
**Author:** ![elfufu](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/elfufu/32/566076_2.png) [@elfufu](https://forums.unrealengine.com/u/elfufu)\ **Post date:** [January 28, 2025, 11:34pm UTC](https://forums.unrealengine.com/t/ue4-26-alembic-fbx-animation-caches-not-syncing-up/476189/2 "2025-01-28T23:34:59Z")
Did you ever figure this out? ---
**Author:** ![Galagast](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Galagast](https://forums.unrealengine.com/u/Galagast)\ **Post date:** [June 1, 2025, 5:18am UTC](https://forums.unrealengine.com/t/ue4-26-alembic-fbx-animation-caches-not-syncing-up/476189/3 "2025-06-01T05:18:59Z")
I wanted to share a similar issue and a fix in case others would encounter the problem. _tldr: Need to match source frame rates (of both the alembic and FBX) prior to exporting_ **Scenario:** - I have an alembic animation of a character holding a wand - I also have an FBX animation of the wand (so that i can access the rig for VFX) - In my case, the alembic was exported from blender, and the FBX from Houdini **Issue:** - The FBX wand animation is not aligned to the alembic wand ![issue](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/8/7/f87ff68868933c8c0f219e95e9d2c9865d92fa35.jpeg) **Investigation:** - Noticed that the alembic file had 30 FPS frame rate ![Alembic frame rate](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/3/6/c36c13f9f82c23d24c34a5039f7a23df3cf83bc2.png) - While the FBX animation had 24 FPS ![FBX frame rate](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/f/71f9b23281801ace75d2821eee07a606569cbb49.jpeg) **FIX:** - I went back to Houdini, and fixed my scene’s frame rate from 24 to 30 fps: ![houdini fps](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/7/8/778b32dc7b57a89cc0d3c45f0f67c8006efe6727.jpeg) - This is to match my blender alembic frame rate: ![blender frame rate](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/9/3/293f5497c9bf898dc4772398c7c08a1ef85dd9e7.jpeg) - Results: ![results](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/6/7/067a259d927dd2af32e4378af0aa8e1e212c13ab.jpeg) **NOTES** - Initially, I had to offset the FBX animation in the sequencer to start at frame 1 for it to match the alembic animation: ![offset](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/d/3/bd3ce6ebaaa9352d5cc94ad9a57545a0461d9073.png) This is because my Houdini scene starts at frame 1 (by default). - The fix was to simply go back to the Houdini animation options again and set start frame to 0, then re-export the animation FBX.