How to see the memory size for HLOD meshes and materials

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We are trying to manage the fidelity of our generated HLOD meshes/materials/textures against their in memory usage. When trying to use the Size Map on the generated mesh, it simply shows ‘Unknown Size’ as shown in the attached screenshot (from the publicly available City Sample).

Is there a way to get a readout of how much memory a given HLOD actor and it’s generated assets will take in game?

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Any chance I can get an update on this?

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Hi Brian,

Unfortunatelly it’s currently not possible to use the Size Map feature to obtain information regarding external actors in a World Partition map.

You can however get stats for your HLOD actors using the following console command:

> wp.Editor.HLOD.DumpStats

This will write a CSV file to disk and the path should be shown in the logs as such:

“LogHLODEditorSubsystem: Display: Wrote HLOD stats to ../../../YourProject/Saved/Logs/WorldPartition/HLODStats-0001235c-2026.01.06-15.13.36.csv”

You won’t get exact numbers regarding the memory usage once cooked, but this should hopefully give you some hints.

Note that in the City Sample project the memory taken exclusively by HLODs at runtime is pretty minimal. This is due to the fact that the HLOD meshes are all using Nanite, so their geometry is automatically streamed to common Nanite pools shared with the rest of the world’s meshes. The same actually applies to HLOD textures, which share Virtual Texture pools with the rest of the data. In effect, I think we measured the actual impact of HLODs to be around ~100MB at runtime (measured by running with/without HLODs and comparing the total memory usage).

FYI we are planning a World Partition Insight integration in a future UE release which will give a ton of information.

Regards,

Sebastien

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Thanks for the answer! It’s too bad to hear that there isn’t any way to get size info about external actors as that tool is really quite amazing for tracking down problematic assets.

We’ll give the stat dump a try and see if it gets us close enough. Excited to hear that WP will be getting insight integration as we also leverage insights pretty extensively.

Cheers,

Brian

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