Description

Render optimizations are causing the cloth render data to be updated one frame too late after an off screen cloth object has been teleported back on screen. The optimisation triggers itself after a few second of the cloth object being off-screen.

This problem affects licensees who are teleporting their characters off-screen and disabling the transform tick update for optimization purpose.

The only workaround is to set Visibility Based Anim Tick Optimization to Always Tick Pose and Refresh Bones, which is not a long term viable solution.

Steps to Reproduce
  1. Create a level with Blueprint containing a skeletal mesh with cloth simulation.
  2. Add Blueprint code to teleport the actor and make it stays at different places for a few seconds.
  3. Play in Pie, wait until the cloth goes off camera, then back on.

Result: Stretched geometry appears on screen between the off screen position to the new screen position for one frame.

Expected: The cloth correctly renders after the teleport operation without stretching across the screen.

Have Comments or More Details?

There's no existing public thread on this issue, so head over to AnswerHub just mention UE-124530 in the post.

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Unresolved
CreatedAug 26, 2021
UpdatedOct 12, 2021