Mesh Terrain just not working

General Issues and Bug Reporting (Unreal Engine)
1

Summary

Mesh Terrain unsuable - takes forever to load on a basic rectangle and when trying to play in standalone crashes on an empty mesh terrain map.
Assertion failed: ComponentNativeClass [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\WorldPartition\WorldPartitionActorDesc.cpp] [Line: 913]

What Type of Bug are you experiencing?

World Creation Tools

Steps to Reproduce

make a basic terrain mesh landscape and just press play standalone.

Expected Result

it should load - mesh terrain just doesnt work.

Observed Result

crash

Affects Versions

5.8

Platform(s)

Windows

2

What I have done…

I know that this shouldn’t make a bit of difference, but have you tried it with an imported heightmap?

Have you set your World Settings to be loading your Game Overide Setting?

Is there a PlayerStart loaded onto the map?

I have successfully imported a 8k map and ran across some of it. Runs like crap but it works.

3

Did it work in standalone?
I get the same error as OP when I try to standalone play (both PIE and Packaged) a level that has a mesh terrain in it

4

Got the same crash with StandAlone.

Also just in PIE the landscape always has visual arifacts, like holes. I think because of nanite

5

Managed to get standalone working after making sure that all plugins were set properly, removed saved and intermediate. Launched the engine from EGS, which installed prerequisites for 5.8.0. Then relaunched my project and packaged again. Now the levels with a Mesh Terrain load correctly and work fine!

On this Discord thread we had a discussion with Roey about the PIE standalone issue and he was able to replicate.

6

Having this issue as well. Please fix Epic!!!

7

I was having the same issue as the OP when trying to run a level after using Mesh Terrain Partitions… it was taking up to 10 minutes to load the level into play mode.

After a LOT of troubleshooting, I suspected a corrupted DDC cache reference… so I closed the project and deleted the DerivedDataCache, Intermediate, and Saved folders in my project folder.

Reloading the project caused the shaders to recompile and the project now loads into play mode in less than a second.

However, I am still not able to run the level in stand-alone mode without it crashing.

Hope this helps.

8

Have you Built the Mesh Terrain from the Build menu before starting PIE? That got rid of the initial long wait before getting into the game for me and maybe will help the crash you are experiencing?