Landmass River brush is completely broken.

Extrahdmi
Wed, 04 Feb 2026 10:05:04 +0000
World Creation

I’m trying out the Landmass brush to edit my landscape, but nothing is working.

Epic Games Developer

Landscape Blueprint Brushes in Unreal Engine | Unreal Engine 5.7 Documentation...

Brushes that enable you to create and manipulate arbitrary terrain regions using shapes defined entirely in Blueprint.

This official document includes a video that makes it seem as if the terrain can be deformed along the river, but in reality, it only generates a river mesh and has no effect on the terrain. I started by trying the default brush settings, then extensively tweaking the falloff settings and mesh sizes, but nothing seemed to change the Landscape.

Additionally, under unknown conditions, the entire landscape may be pushed to its limits, eventually resulting in a GPU crash. I know this feature is in beta, but can’t it be made to work better?

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