3d-buildings-and-meshes SKILL.md skillA
3d-buildings-and-meshes 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/3d-buildings-and-meshes@git:20261026.79a684ePins git:20261026.79a684e 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/3d-buildings-and-meshes/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261026.79a684e, committed Oct 26, 2026
- Size
- 20,257 bytes
- Repository stars
- 24
- License
- GPL-3.0
How 20 map engines build, store, order, light and cull extruded buildings and imported 3D meshes (OSM/PLATEAU buildings, glTF models, TINs), and what they reverted. Load it when a map-from-scratch request mentions 3D buildings, extrusion, height, tilt/pitch, oblique or 2.5D views, shadows, glTF/OBJ models or mesh export, before writing the bake step's wall/mesh layout or the renderer's depth and lighting.
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
# 3D buildings and meshes: bake the prisms, keep the depth, light in the local frame Extruding a footprint looks like one loop over ring edges, but every engine that added it then had to deal with these problems, roughly in this order: precision of heights and coordinates far from the origin, wall winding, triangulation that fails on dirty rings, draw order against other layers and labels, a tile coverage that drops tall buildings whose base is off-screen, memory for millions of wall vertices, and lighting that changes with longitude or camera shear. OsmAnd's "simple 3D buildings" alone took follow-ups for transparency, premultiplied alpha, symbol order, polygon colour and a zoom cut [65][66][67][64]. The engines solved most of these at run time. A renderer that serves one request can solve most of them in `bake.ts`. Numbers in brackets refer to the Sources list. Per-engine detail, with the same numbering, is in [references/engines.md](references/engines.md). Sibling skills go deeper where this one only touches: depth and layer order in [../draw-order-and-depth](../draw-order-and-depth/SKILL.md), local origins …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/3d-buildings-and-meshes@sha256:8236d6916d54955eThe line at the top of this page pins the label git:20261026.79a684e, 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_tev7lkl3u3ji5a2g)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 26, 2026.
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 (20257 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_tev7lkl3u3ji5a2g GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/3d-buildings-and-meshes GET https://markdownregistry.com/api/v1/blob/8236d6916d54955e4514a6556dcc46e93a89c5fcdebf4678839372facb897db2
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.