Rubberbanding when a Movement Modulator is applied after Player Movement Settings

General Issues and Bug Reporting
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1

Summary

Hi everyone, hope you’re doing well! We ran into a bug with Player Movement Settings and would appreciate help from the team finding a solution.

Summary

A player with a Player Movement Settings device applied rubberbands while moving after a Movement Modulator is activated on them. Switching to a class with a Movement Speed Multiplier other than 1.0 causes the same issue.

Steps to reproduce

  1. Create a new empty island.
  2. Place a Player Movement Settings device and a Movement Modulator (Speed other than 1.0).
  3. Apply the Player Movement Settings device to the player.
  4. Activate the Movement Modulator on the same player.
  5. Move.

Expected: smooth movement at the new speed.
Actual: the player rubberbands while moving.

Details

  • Repro rate: 100%
  • Version: Fortnite Release-42.40 (CL 59343437)
  • Platform: PC

Workaround

Activating the modulator before applying the Player Movement Settings device avoids it. We can’t use this in our game: it needs RemoveFrom + AddTo on every speed change, and each call costs 17-30 ms of server time.

Possibly related: FORT-995669.

Thanks a lot, any guidance is appreciated!

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

  1. Create a new empty island.
  2. Place a Player Movement Settings device and a Movement Modulator (Speed other than 1.0).
  3. Apply the Player Movement Settings device to the player.
  4. Activate the Movement Modulator on the same player.
  5. Move.

Expected Result

Smooth movement at the new speed (Player Movement Settings speed multiplied by the modulator).

Observed Result

The player rubberbands while moving. Switching to a class with a Movement Speed Multiplier other than 1.0 causes the same issue. Repro rate: 100%, on any island, including a new empty island with no Verse code.

Platform(s)

PC

Additional Notes

Version: Fortnite Release-42.40 (CL 59343437).

Workaround: activating the modulator before applying the Player Movement Settings device avoids it. We can’t use this in our game: it needs RemoveFrom + AddTo on every speed change, and each call costs 17-30 ms of server time.

Possibly related: FORT-995669.

3

The status of FORT-1177511 changed to ‘Needs Triage’. We are routing this to the appropriate team for investigation.