36 lines
2.3 KiB
Markdown
36 lines
2.3 KiB
Markdown
## Follow-up: Local Controlled-Player Jitter
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Current assessment:
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- Loopback repro means transport delay is not the primary cause of the remaining local-player jitter.
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- The next round should focus on deterministic prediction/reconciliation timing before adding more local smoothing.
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Step-by-step plan:
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1. Align replay integration granularity with live prediction
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- Replace one-shot replay of an accumulated input duration with fixed substeps.
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- Ensure replay uses the same movement integration shape as the normal `FixedUpdate` prediction path, especially for turn-and-move input.
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2. Align client prediction cadence with server authoritative cadence
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- Introduce an explicit local prediction/replay cadence derived from the authoritative movement cadence.
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- Avoid mixing client-side `Time.fixedDeltaTime` prediction with server-side fixed-cadence authoritative integration in reconciliation-sensitive paths.
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3. Stabilize or remove send-rate oscillation driven by server tick offset
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- Revisit `MovementComponent.SetServerTick(...)` and stop toggling `_sendInterval` directly between nearby values when the offset crosses zero.
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- If clock correction is still needed, add hysteresis or filtering so the send cadence does not bounce frame-to-frame.
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4. Re-measure controlled-player correction after timing fixes
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- Keep remote-player interpolation as-is; do not treat local-player jitter as a remote interpolation problem.
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- Only refine local visual correction further if meaningful residual error remains after steps 1-3.
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5. Add regression coverage and diagnostics for the remaining jitter path
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- Add tests that compare live prediction and replayed prediction under the same turn/throttle sequence.
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- Add tests for server tick offset calibration so small offset sign changes do not continuously retarget send cadence.
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- Add or expose diagnostics for acknowledged move tick, predicted pose, authoritative pose, and correction magnitude per snapshot.
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Acceptance:
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- Controlled-player loopback movement no longer shows repeated small pull-back under steady turn-and-move input.
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- Replay after authoritative reconciliation produces the same trajectory shape as forward local prediction for the same input sequence.
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- Small server tick offset fluctuations do not cause visible local cadence oscillation.
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