line-tessellation SKILL.md skillA
line-tessellation from yuiseki/map-from-scratch is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yuiseki/map-from-scratch/line-tessellation@git:20261030.5cc6631Pins git:20261030.5cc6631 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yuiseki/map-from-scratch
- Path
.agents/skills/line-tessellation/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261030.5cc6631, committed Oct 30, 2026
- First version recorded
- Oct 26, 2026
- Size
- 33,196 bytes
- Repository stars
- 24
- License
- GPL-3.0
How map engines turn polylines into triangles or pixels of the right width (where the width lives, vertex layout, joins and caps, edge antialiasing, distance along the line for dashes, clipping and tile seams, vertex reduction before stroking), with what they measured and what they reverted. Load it when a map-from-scratch request draws roads, borders, routes, tracks, contours or any stroke wider than a hairline, before writing the line part of `bake.ts` or the line shader, or when lines…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Line tessellation: from a polyline to a stroke of the right width A polyline has no width. To draw it, a renderer must choose where the width is applied (in the data, on the CPU at each zoom, or in the vertex shader), how corners and ends are filled, how edges are antialiased, where distance along the line comes from (dashes, gradients), and what happens where the line is cut by a tile or the viewport. General engines answer all of these at run time for any style; most of their line code handles widths, joins, dashes and offsets that a given map never uses. A renderer made for one request knows the widths, the zoom range and the style, so most of the work and many of the failure modes can be settled at bake time. This repo already draws lines two ways: 1 px borders with `gl.LINES` (02) and a road network as instanced 4-vertex strips widened in the vertex shader, with square caps hiding the joints, one draw call, 1.2 M segments in 1.1 ms p95 (05) [117]. Read this before going beyond that. Per-engine detail and smaller decisions: [references/engines.md](references/engines.md). Numbers in brackets refer to the Sources list at the end of this file. …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/line-tessellation@sha256:6971715181adf0ecThe line at the top of this page pins the label git:20261030.5cc6631, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_kra7aj6wldnax2xq)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Oct 26, 2026 and Oct 30, 2026, about one every day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261030.5cc6631 latest | 2026-10-30 | 5cc6631 | 33,196 B | A | view · diff |
| git:20261030.f6fcde0 | 2026-10-30 | f6fcde0 | 32,869 B | A | view · diff |
| git:20261027.231c915 | 2026-10-27 | 231c915 | 32,234 B | A | view · diff |
| git:20261026.79a684e | 2026-10-26 | 79a684e | 32,232 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (33196 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yuiseki/map-from-scratch · 24 stars · license GPL-3.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kra7aj6wldnax2xq GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/line-tessellation GET https://markdownregistry.com/api/v1/blob/6971715181adf0ec0e84aa7eff551487aface1347158b6fdece08d19eced2bf4
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.