# Ground Zero First-Pass Foliage

The Ground Zero demo map now has a first-pass foliage layer driven by terrain
height and simple biome placement rules.

## Implementation

- Native actor: `AAgrarianFoliagePatch`
- Map setup script: `Scripts/setup_ground_zero_demo_map.py`
- Map actor label: `AGR_GroundZeroFoliage_FirstPass`
- Mesh source: Unreal level prototyping meshes for now.

The actor uses hierarchical instanced static mesh components for three visible
foliage groups:

- Trees: taller cylinder instances placed mostly on higher/hill terrain.
- Shrubs: low blocky scrub instances across valley and hillside terrain.
- Grass: small clump instances across the broader walkable tile.

## Placement Rules

The first pass is intentionally deterministic. It uses the Ground Zero Unreal
heightmap and a fixed random seed so repeated map setup runs produce the same
foliage distribution.

The placement avoids the demo player start, shelter, campfire, resource nodes,
and wildlife spawn area so the initial investor path remains readable.

## Counts

- Trees: `42`
- Shrubs: `96`
- Grass clumps: `180`

## Follow-Up

This is a visual and performance-safe placeholder pass, not final ecology. The
current prototype geometry now uses dedicated Ground Zero tree, shrub, and dry
grass materials. The next biome/resource passes should replace prototype meshes
with real coastal California scrub, grassland, woodland, and resource-specific
assets, then tie spawn density to land-cover and hydrography data.