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ralpha-assets/benchmark/references/urban/paris-eiffel/metadata.md

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Paris Eiffel Tower — Seine Golden Hour

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

Source

  • Flickr: https://www.flickr.com/photos/75487768@N04/52395375673
  • Photographer: barnyz (Flickr user 75487768@N04)
  • Title: "Paris"
  • Original Filename: 52395375673_9981be45d2_o.jpg
  • Camera: Sony A7 III (ILCE-7M3)
  • Lens: Sony FE 24-105mm F4 G OSS (SEL24105G) @ 24mm f/5.0
  • Exposure: 1/80s, ISO 100
  • Software: Capture One 12.1.5 (Windows)
  • 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 (estimated from geometry, no GPS in EXIF)
  • 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

{"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

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: CC BY-NC-ND 2.0 (Attribution-NonCommercial-NoDerivatives)
  • Attribution: "Paris" by barnyz — https://www.flickr.com/photos/75487768@N04/52395375673
  • Attribution Required: Yes
  • Original Filename: 52395375673_9981be45d2_o.jpg
  • Use: Internal benchmark archetype image (not sold, not used in marketing). If benchmarks are published externally, verify CC BY-NC-ND 2.0 compliance with legal.