I Draw a Line Here Assembly Summer '26 — AI Coding (Vibe Demo) entry CONCEPT The demo obeys one absolute visual rule: every visible element, including all lettering, is drawn only as straight line segments between two points. The entire show lives in two CSV files: Graphics.csv holds timestamped normalized line segments, and Music.csv holds the soundtrack as timestamped normalized sample levels under the same hold-until-changed model. Every player and renderer in the repository is a generic interpreter of that data. The soundtrack samples "Electronic Electro" by Watermello (composer Daniil Kharlamov), Pixabay track 477141. The track page presents it under the Pixabay Content License and marks it as Content ID registered. The repository's own tools/sample-track.py resamples it into the same normalized sample-and-hold CSV rows as everything else. Music.csv is intended only as embedded music for this demo, not for standalone extraction or redistribution. Source, official terms, Content ID notes, and the download records to retain are in docs/MUSIC_LICENSE.md. A fully synthesized alternative score (tools/compose-music.py) and an earlier piano score (git tag soundtrack-piano) remain in the repository. AI TOOLS USED The code was written with two AI coding agents, per the compo rules: - ChatGPT (OpenAI Codex) — project code, including the players, editors, the 1080p60 MP4 renderer (tools/LineCSVMP4Renderer.swift), and the alternative native 3D Metal renderer (Sources/LineMetal). - Claude (Anthropic Claude Code) — project code, rules-compliance fixes, the release tooling, the image-to-line-segment vectorizer (tools/image-to-lines.py, OpenCV Canny/contour edge detection, not a generative model), and render verification. The demo content (the line data in Graphics.csv) is a mix of: - hand-drawn scenes made with the repository's own line editors (web/editor.html and the LineEditor macOS app), and - 27 scenes algorithmically traced from public-domain artworks (all artists died 1955 or earlier; no fan art of copyrighted work) using the vectorizer above, curated down from a larger review draft covering nearly every candidate in docs/PUBLIC_DOMAIN_ART.md. The underlying works are public domain in Finland; several exact modern reference photographs are CC0, CC BY, or CC BY-SA rather than public domain. Required photographer credits, licences, change notices, exact source links, and object records are in docs/ART_SOURCE_LICENSES.md and docs/THIRD_PARTY_NOTICES.md. None of the scenes is fan art of a copyrighted work. The same sources and licences must be declared in the Partyman entry form, not only in this archive. RUNNING THE ENTRY Primary submitted executable (macOS 14 or newer, Apple Silicon or Intel): Double-click "I Draw a Line Here.app". The signed, self-contained app reads Graphics.csv and Music.csv from its own resources, starts at time zero, and enters full screen. ESC exits. Space pauses, R rewinds, F toggles full screen, and the arrow keys seek by five seconds. The signed "i-draw-a-line-here-installer.pkg" installs the same app into /Applications. Installing is optional: the app in the ZIP runs directly. Source-tree browser playback (any modern desktop browser): ./tools/serve-web.sh # then open the printed local URL Press "Present fullscreen": the player rewinds, waits ten seconds, and plays the full show. The mouse cursor is hidden while presenting. ESC leaves fullscreen at any time. Source-tree native Metal performance: ./tools/run-metal-hallucination.sh This full-colour renderer hallucinates every non-empty CSV scene into a deterministic volumetric wireframe: front and back surfaces, side walls, ribs, and internal trusses. Eight geometry-derived model families and ten different camera choreographies replace a repeated spin. All ten are used before repeating, and they include true lateral, vertical, depth-only, target-scan, held-rear, staged, and orbital camera languages rather than variants of one centre orbit. Structural core strokes are 2x for the large 1080p party screen; only the strongest current-shell onsets briefly reach 3.5x. Tiny, short-lived four-ray pixel glints attach to the picture's base source strokes, not to the musical bassline. Every visible mark remains a straight line. The renderer itself adds no authored visual or audio asset beyond the two declared CSV inputs. Alternative native Metal 1080p60 capture: ./tools/render-metal-1080p60.sh \ artifacts/i-draw-a-line-here-volumetric-1080p60.mp4 Native macOS frame preview: swift run LineDemo --time 0.03 Deterministic playback: the show is a fixed CSV timeline and renders the same way on every run. VIDEO CAPTURE The intended submitted 1080p60 video is produced with the repository's own deterministic volumetric Metal renderer from the same Graphics.csv and Music.csv: ./tools/render-metal-1080p60.sh \ artifacts/i-draw-a-line-here-volumetric-1080p60.mp4 It outputs 1920x1080 H.264 at 60 fps with 4x MSAA and a 48 kHz mono AAC soundtrack mixed from Music.csv. The signed universal app, signed installer, capture, screenshot, nested source-code ZIP, licence records, and one final outer ZIP are generated with: ./tools/build-submission.sh LENGTH Exactly 2:28.3 — the content runs at double pace, far under the compo's five-minute maximum. The timeline opens with a real-time 5-second broadcast-style blank leader (no image, no sound); the show and the soundtrack both begin together at 0:05. The soundtrack ends unchanged at 2:18.3; the credit card remains face-on for another five seconds through 2:23.3, followed by five seconds of black and silence. Graphics.csv and Music.csv declare duration_seconds=148.3. COMPO COMPLIANCE / FINAL SUBMISSION CHECKLIST Official Assembly Summer 2026 AI Coding (Vibe Demo) rules: https://assembly.org/en/events/summer26/info-en/demo-competition-rules#AI_Coding_Vibe_Demo Official copyright guidance: https://assembly.org/en/events/summer26/info-en/demo-competition-rules#On_Copyright [x] Executable real-time production: LineMetal renders the CSV data live. [x] Duration: 148.3 seconds, below the five-minute maximum. [x] Repeatability: fixed CSV inputs and deterministic geometry, effects, camera scheduling, still rendering, and movie rendering. [x] Presentation controls: full-screen mode hides the mouse cursor and ESC exits the native production at any time. [x] Platform is stated: macOS 14 or newer with Apple Metal. [x] AI tools and their roles are listed above. [x] Build and include the native executable in the submitted archive. [x] Render, inspect, and include the required 1080p video capture; the provided deterministic target is 1920x1080 at 60 fps. [x] Render, inspect, and include the required screenshot. [x] Prepare macOS 14+/Apple Metal and exact run instructions for the Partyman submission fields in docs/SUBMISSION_FORM.md; coordinate own-machine capture or proof with CompoCrew if requested. [ ] Declare and link every artwork/reference-image source and licence in the Partyman entry form. The underlying works are public domain, but the modern reference photographs identified in the ledger retain their stated CC terms. [ ] Declare the Pixabay track, its source URL, and applicable licence in the entry form; obtain and retain its download certificate as detailed in docs/MUSIC_LICENSE.md. [ ] Ask CompoCrew to confirm the sampled stock track is acceptable for this compo and retain the written answer with the release records.