World partition landscape and actors gone after crash, map still playable, but cannot edit.

Had an open world test map was working through some world partition magic.. long story short everything was going fine until I had a crash to desktop. Unfortunately I can’t give more specifics than that, the crash was sufficient enough to need a restart so I could not get the whole message.

Load back into the project, the minimap for partition is gone, the world is just blue with no landscape, no actors etc. Outliner still has all the items etc, but everything is listed as unloaded despite having supposedly having region loaded in partition. That having been said the minimap that shows is not accurate to what the map was so not sure its of any value anymore. If I play the map, everything loads fine, everything is where it should be, just can’t edit anything.

Steps I’ve taken so far:

  1. Load unload areas of the region, no changes
  2. Made sure landscape was turned on in show. it was.
  3. Rebuilt the entire project from scratch. no changes.
  4. Checked output log, no obvious answers or errors.
  5. tried to rebuild minimap, it goes through the motions, but it takes about 2 seconds and doesn’t provide a different minimap, its still wrong
  6. tried rebuilding HLODs and landscape spline meshes. no changes.
  7. Double checked I’m not too high or too low where I might be out of visible range of the landscape
  8. Read a handful of topics here and watched a few videos. Nothing seems to change the current issue.

Another oddity. With everything unloaded I can now see some general landscape, however its got a big hole in the middle.


If I load a section, the hole in the middle gets worse

Which is why with everything loaded I couldn’t see anything initially.

Not ruling out its something I’m doing wrong running out of ideas. Any assistance would be greatly appreciated.

Did you get it working?

When I get crashes that impact almost everything, it usually helps to delete the Binaries, Saved and Intermediate folders and then open it and select “rebuild”.

We did try deleting those folders and rebuilding didn’t help. Ultimately it was a test map so I ended scrapping it. Just makes me concerned that it could happen on a real map that we’ve spent countless hours on without a fix. Thank you for checking in though.

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depends on the level you loaded, i noticed when i did it with a empty from start without the hlods it worked.

Seems like a corrupted actor

Landscape Streaming Proxies are saved in Content/ExternalActors

To prevent data loss on a real project, I suggest to set up some sort of source control (and backups).
It saved us multiple times from data loss because of corrupted files.

For our project we use Perforce