M/ Circuit — outdoor lighting and road textures, V20

CC0 1.0 Universal: https://creativecommons.org/publicdomain/zero/1.0/
Poly Haven license: https://polyhaven.com/license
No purchase or paid API used. Original downloads retained unchanged.

sky.hdr
Kloppenheim 06 (Pure Sky), 2K HDR
Greg Zaal (original), Jarod Guest (sky edit)
https://polyhaven.com/a/kloppenheim_06_puresky

asphalt-color.jpg, asphalt-normal.jpg, asphalt-arm.jpg
Asphalt 02, Rob Tuytel, 1K textures, 3 m physical tile
https://polyhaven.com/a/asphalt_02
Diffuse color, OpenGL normal, packed AO/roughness/metallic.
Only the roughness channel of ARM is sampled by the current road material.

Runtime adaptations: environment intensity and reflection filtering; albedo
variation, normal strength, roughness modulation and blended texture sampling.
Downloaded-file hashes and exact URLs: project preuves/ASSETS-REALISME-V20.json.

V21 — after-rain rendering

sunset.hdr: Qwantani Sunset (Pure Sky), Greg Zaal (photography),
Jarod Guest (processing). CC0.
https://polyhaven.com/a/qwantani_sunset_puresky

forest.glb: Tree Small 02 by Rico Cilliers; Pine Sapling Small by
Rob Tuytel (photography) and Rico Cilliers (modeling). CC0.
https://polyhaven.com/a/tree_small_02
https://polyhaven.com/a/pine_sapling_small
Full foliage meshes retained and combined; Draco compression and shared
textures. Runtime generates 16 views of each model into HDR cutout atlases.
The atlases are rendered as instanced vegetation with matching alpha shadows.

 grass-color.jpg / grass-normal.jpg: Leafy Grass, Charlotte Baglioni, CC0.
https://polyhaven.com/a/leafy_grass
 gravel-color.jpg / gravel-normal.jpg: Gravel Floor, Matterfield (photography)
and Jenelle van Heerden (processing), CC0.
https://polyhaven.com/a/gravel_floor
Original texture downloads retained unchanged; shading varies in the scene.

All original source downloads and hashes are preserved outside the Site in
sources/realism-v21 and preuves/ASSETS-REALISME-V21.json. The earlier V20 sky
remains in the repository; sunset.hdr is the active sky.

Planar reflection / oblique clipping math in race-reflections.js adapted from
Three.js Reflector, MIT. Original authors and full notice: ../../vendor/LICENSE-three.txt
Source: https://github.com/mrdoob/three.js/blob/r180/examples/jsm/objects/Reflector.js