# Paris Eiffel Tower — Seine Golden Hour

**Full Cesium → Living Replacement benchmark.** Tests every layer of the geo-world pipeline.

## Source
- **File**: Flickr, Sony A7 III, 24mm f/5.0
- **Date**: 2022-06-25 20:17 (golden hour, ~90min before sunset)
- **Location**: South bank of Seine, Quai de Branly
- **Coordinates**: 48.8577 N, 2.3011 E
- **Altitude**: ~33m above sea level

## Scene Characterisation

| Property | Value |
|----------|-------|
| Environment | Outdoor |
| Domain | CESIUM (GEO + SKY + WATER) |
| Setting | Urban river, Paris |
| Time of Day | Golden hour (~20:17, June) |
| Season | Summer |
| Weather | Clear with high stratus |
| Mood | Serene, warm, golden |

## Key Elements (27 total — see breakdown.md)
1. **Eiffel Tower** — hero element, lit golden by low western sun
2. **Seine river** — foreground, light chop, sky/gold reflections
3. **Sky gradient** — warm horizon to blue zenith, thin stratus + cumulus
4. **Pont de Bir-Hakeim** — stone arch bridge, left of frame
5. **Tour boats** — white hull, moored at quay, string lights
6. **Tree line** — Champ de Mars, 15-20 mature deciduous trees
7. **Haussmann buildings** — cream stone, mansard roofs, behind trees
8. **Street furniture** — lamps, bollards, signs, closed cafe

## Replacement Layers (Cesium → Living)
| Layer | Cesium (static) | Living Replacement |
|-------|----------------|-------------------|
| Sky | None (no sky in tiles) | SkyAtmosphere + VolumetricCloud |
| Water | Baked blue texture | UE5 Water Body (Seine, reflections, ripple) |
| Lighting | Baked shadows | DirectionalLight, golden hour sun angle |
| Vegetation | Frozen trees | UE5 Foliage (wind, proper materials) |
| Boats | Static mesh | Spawned props (optional animation) |

## Cesium Setup
```json
{"type": "spawn_cesium_world", "latitude": 48.8577, "longitude": 2.3011, "altitude": 0}
{"type": "set_camera_geo", "latitude": 48.8577, "longitude": 2.3011, "height": 5, "pitch": 5, "yaw": 340}
```

## Brain Config
```bash
python -m brain \
    --reference benchmark/references/urban/paris-eiffel/reference.jpg \
    --domain CESIUM \
    --llm claude-code \
    --mcp-port 30012 \
    --max-iterations 30
```

## What Success Looks Like
- Eiffel Tower visible and correctly lit golden from the west
- Seine has reflective water surface with gentle ripple (not baked texture)
- Sky gradient from warm horizon to blue zenith with cloud layers
- Golden hour colour temperature (~3000-3500K direct, ~7000K fill)
- Atmospheric perspective on distant elements
- Overall mood matches: serene, warm, golden Paris evening


## Licensing
- **Category**: flickr
- **License**: VERIFY — check original Flickr post
- **Attribution**: Unknown Flickr user
- **Attribution Required**: Yes
- **Notes**: Source: Flickr, Sony A7 III. Must verify license on original post.