Avatar Sliding / Desync Inside Cockpit During Vehicle Movement

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Bug Report: Avatar Sliding / Desync Inside Cockpit During Vehicle Movement

Summary

When operating aircraft in VRChat, my avatar begins sliding, jittering, or drifting inside the cockpit as the aircraft moves away from the world’s spawn point. The issue becomes progressively worse with distance, eventually causing the avatar to clip into the console and making the aircraft difficult to control.

Environment

  • VRChat Client: Fresh install (tested twice)

  • Install Locations Tested:

    • VME drive

    • SATA HDD

  • Worlds Tested: Multiple aircraft‑enabled worlds

  • Avatars Tested: Multiple avatar types (same behavior across all)

  • OCS Settings: Tested both ON and OFF, with client restarts

  • Platform: Desktop mode (adjust if needed)

System Specifications

  • CPU: AMD Ryzen 9 5900XT — 16 cores @ 3.30 GHz

  • RAM: 32 GB DDR

  • GPU: NVIDIA GeForce RTX 2060 (6 GB VRAM)

  • OS: Windows 10

Steps to Reproduce

  1. Join any world that includes a flyable aircraft.

  2. Enter the cockpit and sit in the pilot seat.

  3. Begin taxiing or flying away from the world’s spawn point.

  4. Continue increasing distance from spawn while remaining in contact with the ground or flying normally.

Observed Behavior

  • Both the aircraft and avatar begin to jitter as distance from spawn increases.

  • Avatar gradually drifts out of the seated position.

  • At moderate distances, the avatar becomes offset enough to clip into the cockpit console.

  • Speed does not appear to influence the issue — only distance from spawn.

  • Issue occurs across multiple worlds and avatars, suggesting it is not world‑specific or avatar‑specific.

  • Clean installs on two different drives did not change the behavior.

  • Other users in the aircraft have witnessed my avatar sliding and drifting during flight, confirming the issue is visible externally and not just on my client.

Temporary Workaround

Toggling OCS (Object Culling System) resets the avatar back to the correct seated position.

  • Accessible via Escape Menu

  • Or via Radial Menu → R key
    Both appear to trigger the same OCS refresh.

Expected Behavior

Avatar should remain anchored to the cockpit seat regardless of distance traveled from spawn, without jittering or drifting.

Additional Notes

  • The issue resembles floating‑origin precision loss, but the severity suggests something may be affecting avatar root synchronization or seat constraints.

  • Since both aircraft and avatar jitter, this may be related to world origin shifting or physics update desync.

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