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Thirdperson Character not Replicating correctly after being attached to an Actor (Blueprints, Project included)

Problem description: When the Third Person Character gets attached to any other Actor (AttachToActor, Rule: Keep World), from the view of other clients the character (capsule, skeletal mesh) is out of sync (*).

(*) Out of sync in that case means two things: (1) the capsule+skeletal mesh keep moving at the velocity and with the animation that the character had at the point of attachment, so even if the pawn of the owning client comes to a halt or changes direction, the capsule and mesh do not follow (observed from other clients). (2) the capsule leaves a "ghost" collision at the point of attachment, i.e. even though the capsule moves as described in (1) as can be observed when "hidden in game" is set to false on the capsule, an active collision remains at the location the character was at when getting attached. This collision (again, which only exists for other clients) does not show when invoking the "show collision" console command.

Steps to reproduce:

  1. Create new Thirdperson project

  2. Open ThirdpersonCharacter blueprint and make sure Replication is set to true

  3. Create new Blueprint Actor, "BP_AttachmentReplication"

  4. Here, set Replicates to true

  5. Add Box Collision Component to "BP_AttachmentReplication"

  6. Set Component Replicates to true on the Box Collision

  7. Add an On Begin Overlap Event for the Box Collision Component

  8. Set up graph as in this screenshot: http://i.imgur.com/0GkisHP.jpg

  9. Place "BP_AttachmentReplication" Actor in Level

  10. Set "Number Of Players" to 2+

  11. Hit Play and walk each Character inside the collision box of the "BP_AttachmentReplication" Actor

Observed result as shown on this screenshot: http://i.imgur.com/oKCTFYL.jpg - server shows correct behavior, whereas from client1's POV the character controlled by the server just keeps running (invisible on the screenshot, there is also a collision from the character's capsule right where the server character should be).

  • Note 1: step 8. can be set up in various ways (e.g. https://i.imgur.com/sMUSVyz.png), result stays the same.

  • Note 2: this issue does not seem to occur with the First Person character.

I uploaded a clean Thirdperson Template project with the steps above implemented here (4.18.2): http://www87.zippyshare.com/v/DA1qA90G/file.html

Product Version: UE 4.18
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asked Dec 19 '17 at 03:13 PM in Bug Reports

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Cpt.Trips
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Hello Capitan,

Thank you for the report! I was able to repro, your issue has been logged.

https://issues.unrealengine.com/issue/UE-53604

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answered Dec 20 '17 at 03:28 PM

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Alex O ♦♦ STAFF
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