OZON Sorter Digital Twin

Web digital twin of an Ozon Tech Track 3 conveyor sorting line: continuous product playback, camera/classification stage, B/C/D routing, and author-CAD diverter motion.

Current product

This repository contains:

• web-based conveyor sorting simulation (/);
• engineering documentation page (/documentation);
• author CAD conveyor source (3d_models/conveer.FCStd);
• runtime conveyor GLB (public/models/sorter/conveyor-clean.glb);
• product STL assets (public/models/*.stl);
• camera / classification stage;
• B / C / D route mapping with CAD left/right diverters;
• Rapier-backed product physics (contact routing not fully validated).

Quick start

npm ci
npm run dev          # http://127.0.0.1:3100
npm test -- --run
npm run build
npm run preview      # http://127.0.0.1:3100

Active routes

Route	Purpose
/	Continuous digital-twin simulation
/documentation	Canonical product / engineering status
*	Redirects to /

Removed routes (/details, /device-test) are not part of the product.

Runtime architecture

index.html
→ src/main.tsx
→ src/App.tsx
→ MainPage (/) | DocumentationPage (/documentation)
→ SorterDigitalTwinContinuous
→ ConveyorCadModel (conveyor-clean.glb)
→ product visuals / physics (STL + Rapier)
→ classifier (domain)
→ diverter product state machine (READY→ARMED→OPENING→HOLDING→CLOSING)

Active assets

Path	Role
3d_models/conveer.FCStd	Author CAD (canonical source)
public/models/sorter/conveyor-clean.glb	Active runtime conveyor
public/models/*.stl	Product models
input_info/*	Official Ozon packs (PDFs/ZIPs)
official_sources/doc-1783095831.pdf	Official classifier bounds source cited by code

Frozen checksums (SHA-256)

3d_models/conveer.FCStd
90c1844a4ca05e26def783d6130fc4b993430dde14307534ef8fbb21c9fac2e6

public/models/sorter/conveyor-clean.glb
1dc7a8d7891bfe756e277ad5368df74cb73410156b2fe0f92845afb8a56f285a

Sorting logic

CURRENT_IMPLEMENTATION_VERIFIED_IN_CODE (src/domain/classifier.ts, src/domain/pusherMotion.ts, unit tests).

Category	Physical route	Active CAD diverter
B	STRAIGHT	none
C	PHYSICAL_LEFT	LEFT, −45°
D	PHYSICAL_RIGHT	RIGHT, +45°

Frozen diverter timing / planes (verified in code + tests):

• rotation duration: 0.50 s
• opening safety margin: 0.15 s
• contact plane S: 1.0538 (fallback hinge geometry ≈ 1.0536)
• clear plane S: 1.6000

Classifier bounds (code + official_sources/doc-1783095831.pdf reference; PDF not re-parsed in this doc pass):

• dimensions strictly > 10×10×10 mm and < 450×320×320 mm
• circular when K > 0.8
• check order: dimensions → C, else circular → D, else B

Missing primary brief (do not cite as present): input_info/extracted/Постановка_Задача_3_сжато_2.pdf.

Validation

• Unit tests: 221/221 (npm test -- --run)
• Production build: PASS (npm run build)
• Two-page routing: / + /documentation
• CAD / GLB checksums: verified against values above
• Diverter frozen angles / duration: covered by unit tests
• Physical junction contact matrix: 45/45 — ENGINEERING-DERIVED PHYSICAL VALIDATION (not production-certified)

Physics (junction contact)

• Same dynamic product rigid body through spawn → junction → receiver settle
• LEFT/RIGHT CAD diverters use kinematicPositionBased colliders synced to the accepted CAD yaw
• B: physical straight corridor; C/D: contact-only redirection; receiver sensors detect only
• Temporary scripted junction handoff removed from the active product path

Current limitations

• Product profiles are engineering-derived, not production-calibrated.
• Author CAD horn / complete transmission is absent or incomplete in the active GLB (AUTHOR_CAD_INCOMPLETE).
• Official compliance claims are limited by the missing extracted task PDF and by not re-parsing PDFs in every doc pass.
• Generated screenshots, videos, Gate stage folders, and tool out/ trees are not canonical.

Repository policy

• Keep author CAD, active runtime assets, official sources, build configs, and tests that protect active behavior.
• Generated outputs and historical media are not product truth.
• Rollback point: git baseline 4413f01 on dan_branch.

See also: /documentation in the running app, and docs/ENGINEERING.md.