Enhance Terrain Models with Tree Placement

I have 5 terrain models (real-world based) that need to be cleaned slightly and filled with trees in certain areas to cover distortions or empty spaces. The goal is not ultra-realistic scattering, but simply a natural distribution that makes the terrains look better when imported into Unity.

Requirements

Terrain Cleanup

Clean or smooth distorted/rough areas of the 5 provided terrains.

Minor mesh adjustments only — no need for detailed sculpting.

Tree Placement

I will provide tree models to be used.

Spread trees over the terrains (especially covering distorted/empty parts).

The scattering doesn’t need to be highly realistic, just enough to make the scene look presentable.

Blender Workflow

You can use Geometry Nodes or manual scattering.

Apply/realize instances so the trees are converted to actual geometry (not procedural).

Deliverables

5 Blend Files

Each terrain with trees placed and visible.

Geometry Nodes (if used) should be applied so nothing disappears.

5 FBX Files

Exported versions ready to import into Unity.

Trees should be visible in Unity without additional setup.
files:
https://drive.google.com/file/d/1FHvQ8hK62zTMpvenGbDxgCAVe1hbj1rX/view?usp=drive_link