Petite Ceinture — Avatar interaction & local field deformation

Field notes — Petite Ceinture & Bridge, January 2026
Paris, 12e arrondissement — 06.01.2026

→ English below


Tests d’interaction en vue à la troisième personne dans deux environnements Gaussian Splatting reconstruits sous Unreal Engine : la voie ferrée de la Petite Ceinture et le pont adjacent. L’avatar se déplace dans le radiance field — l’espace réagit localement à son passage, produisant des déformations spatiales le long du trajet. Exploration des comportements de forces de particules appliquées à la navigation dans des espaces réels reconstruits.

Third-person interaction tests inside two Gaussian Splatting reconstructions in Unreal Engine: the Petite Ceinture railway and the adjacent bridge. The avatar navigates through the radiance field — the environment reacts locally to the player’s movement, producing spatial deformations along the path. Particle force behaviors applied to navigation in reconstructed real-world spaces.


1 — Third-person avatar interaction

Avatar interaction & local radiance field deformation — Unreal Engine
Petite Ceinture & Bridge, Paris 12e


Training

Method: Gaussian Splatting (PostShot)
Images: 938 + 625
Splats: 2.0M
Iterations: 150k
Alignment: RealityCapture — 850 + 572 aligned images

Processing

Post-clean: none

Capture

Camera: Insta360 X4
Projection: equirectangular
Location: Petite Ceinture & Bridge, Paris 12e — outdoor / snow


2 — Particle dispersion on avatar passage

Splat dispersion along avatar path — Unreal Engine


3 — Particle dispersion on avatar passage

Splat dispersion along avatar path — Unreal Engine


4 — Particle dispersion on avatar passage

Splat dispersion along avatar path — Unreal Engine


— Nicolas Mimault, Bagnolet / Paris · nmimault@gmail.com

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