float-precision SKILL.md skillA
float-precision 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/float-precision@git:20261027.231c915Pins git:20261027.231c915 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/float-precision/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261027.231c915, committed Oct 27, 2026
- First version recorded
- Oct 26, 2026
- Size
- 25,068 bytes
- Repository stars
- 24
- License
- GPL-3.0
What 44 map engines learnt about float32 (and fixed-point, integer and CSS/Canvas) precision, and which of their fixes a purpose-built renderer needs. Load it when choosing the coordinate frame, vertex attribute types, quantisation grid or shader precision qualifiers of a renderer, when the request zooms past ~z15, draws a globe or 3D with a depth buffer, or dashes long lines, and whenever a bench or screenshot shows jitter, snapping, wobble, seams, z-fighting, banding, drifting patterns or…
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
# Float precision: keep large numbers off the GPU A float32 has a 24-bit significand: about 16 million steps over whatever range a number spans. Over the Earth's circumference that is one value per ~2.5 m [1]; at the Earth's radius (ECEF) about 1 m [21]; integers above 2^24 are no longer exact [66]. Every engine that uploaded world coordinates, or let the GPU add a large camera term to a small offset, saw the same symptoms at street zoom: vertices wobble or snap while the camera moves [21][40][74], tiles show seams [77][85], depth z-fights [32], dashes and patterns drift [52][80], and thin attributes quantise to nothing on overzoom [101]. The same limit hides outside shaders: Canvas 2D matrices are float32 [96], CSS transforms break past 2^23 px [88], SVG locked Firefox past ~15,000 px [84], and JS `<<` is 32-bit [97]. The cure every engine converged on is the same: keep numbers small where float32 does the arithmetic, and do the large subtraction once, in float64 or integers, on the CPU or at bake time. ## Decide at design time 1. **Is one origin enough?** Work out the worst pixel error of the plan before writing the shader (rule of thumb below). City-scale data with a …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/float-precision@sha256:5c0170a2354aa6d4The line at the top of this page pins the label git:20261027.231c915, 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_w5hitogf3hos42u2)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 26, 2026 and Oct 27, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261027.231c915 latest | 2026-10-27 | 231c915 | 25,068 B | A | view · diff |
| git:20261026.79a684e | 2026-10-26 | 79a684e | 25,063 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 (25068 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_w5hitogf3hos42u2 GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/float-precision GET https://markdownregistry.com/api/v1/blob/5c0170a2354aa6d477cb1060d93e1c07cd2ff2ce57261329a09ec71b36df09f6
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.