3D STUDIO — SOURCE AND INTEGRATION

CURRENT PRESENTATION
The engineering feature uses a continuous matte 3D floor, a neutral studio
background, and the live truck and trailer. Floor, camera, contact patches and
cast shadows share one three-dimensional scene. There is no photographic road
backplate, Yosemite setting or night highway in this implementation.
The visible studio is code-built scene geometry, not filmed truck footage or
an image generated to stand in for the truck.

PHOTOGRAPHIC REFLECTION LIGHTING
Studio Small 08 by Sergej Majboroda / Poly Haven, CC0 1.0.
https://polyhaven.com/a/studio_small_08
https://polyhaven.com/license

The source is a real photographic studio HDRI with rectangular softboxes and
octaboxes. It supplies reflections and environment illumination; the photographed
room itself is not displayed as the scene background. It is a general photo
studio capture, not a measured full-size truck or automotive facility.

Bundled asset: assets/environments/studio-small-08-2k.hdr
Resolution: 2048x1024. File size: 5,930,381 bytes.
Official MD5: 18571cc63a24b0b7b9e9e7c909b3e8ee
The downloaded file matches that checksum. Source pixels are unchanged.
Download:
https://dl.polyhaven.org/file/ph-assets/HDRIs/hdr/2k/studio_small_08_2k.hdr
Official metadata:
https://api.polyhaven.com/info/studio_small_08
https://api.polyhaven.com/files/studio_small_08
Bundled provenance: assets/environments/studio-source.json
CC0 permits commercial use and redistribution. Credit is retained voluntarily.

SCENE AND MATERIALS
scene-studio.js creates the matte floor, neutral background, soft cast shadow,
key/fill/rim lighting and the shared scene camera. A filtered copy of the HDRI
is prepared for physically based reflections. The source HDRI pixels are not
recolored or replaced with generated textures.

The tractor uses brand navy #0e1a33 with refined paint, chrome, glass and rubber
materials. Its source geometry and useful source texture detail are preserved.
Decorative livery was removed; the source was not reconstructed as exact OEM CAD.

The tractor has a uniform presentation scale of 0.922039325 and a small placement
adjustment, putting its roof at 4.075 m and measured tires on the studio floor.
The trailer roof is 4.1148 m. Uniform scaling preserves source proportions and
vertex data; it does not make other source dimensions match an OEM specification.
The trailer coupling was separately recalibrated while its roof and tire-contact
landmarks remain fixed. See docs/trailer-source.txt for the dimensional changes.

Scroll progress alone controls the rig, camera and rigid component choreography.
Stopping scroll holds the pose; reverse scroll returns the rig and components
along the same paths. Eight source assemblies separate and reassemble without
fabricated replacement geometry. Compatible next-generation VNL parts are
presented as coming soon.

Rendering is requested by interaction or viewport changes, not an idle animation
loop. A GPU timing budget can reduce and gradually recover resolution. No fixed
frame-rate guarantee is made; measured checks belong in browser-validation.txt.
Model attribution and software/typeface licenses remain in credits.html.