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Checks GLB assets against a spec without Blender and embeds the measured proof inside the GLB.
About
Checks GLB assets against a spec without Blender and embeds the measured proof inside the GLB.
Security Report
Valid MCP server (2 strong, 3 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
4 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: RUPA3D_BLENDER
Environment variable: RUPA3D_RUANG
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-tiranyx-rupa3d": {
"env": {
"RUPA3D_RUANG": "your-rupa3d-ruang-here",
"RUPA3D_BLENDER": "your-rupa3d-blender-here"
},
"args": [
"-y",
"rupa3d"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
Rupa3D
3D tooling where every asset carries its own proof.
Rupa3D builds 3D — exact b-rep CAD (OpenCascade), meshes (headless Blender),
and scenes with physics (three.js + Rapier) — and then measures what it
built against closed-form references or independent measurements. The
measurements travel with the asset: a certificate embedded in the GLB at
asset.extras.rupa3d, readable with a few lines of code and no Rupa3D
installed.
It is designed to be driven by AI agents over MCP, and by CI over a command-line gate.
Status — 1.6.2 · 297 tests · MIT · on npm as
rupa3d· in the official MCP Registry asio.github.tiranyx/rupa3d. Developed and tested on Windows 11 with Node 22. Tool descriptions and messages are still in Indonesian.
Use it as an MCP server
claude mcp add rupa3d -- npx -y rupa3d
Or in any MCP client configuration:
{ "mcpServers": { "rupa3d": { "command": "npx", "args": ["-y", "rupa3d"] } } }
Requires Node ≥ 22.14. Workspaces live in ~/.rupa3d; override with
RUPA3D_RUANG.
Blender is optional. 23 of the 36 tools run without it:
| without Blender | tools |
|---|---|
| Check any GLB against a spec; the certificate is embedded in a copy of the file | rupa_periksa with berkas |
| Triangle topology, texel density (pixels per metre), VRAM per texture format | rupa_topologi, rupa_tekstur |
| Convex collision hull, with how far it misses the shape | rupa_proksi |
| Exact b-rep CAD: primitives, booleans, fillets, 2D sketch → solid, exact volume and area, STEP/IGES/STL/GLB export | rupa_cad_* (11 tools) |
| three.js scenes with Rapier physics, published as a single HTML page | rupa_adegan_* (8 tools) |
The other 13 drive headless Blender — bpy modeling, import (GLB, OBJ, FBX,
STL, PLY, SVG), renders, LOD, baking, collision proxies, source-mesh
topology. Blender is found under C:\Program Files\Blender Foundation\*, at
RUPA3D_BLENDER, or as blender on PATH.
What "proves" means
Every number below comes from the test suite or the documentation in this repository.
- Sketch → solid. Extrusion volume is checked against area × distance (area from the shoelace formula), revolution against Pappus's theorem. Recorded errors range from 0 % to 6.03e−14 %; the tests fail above 1e−10 % for extrusion and 1e−8 % for revolution. A result that misses its reference is never saved.
- Exact vs approximate. For a Ø140 mm flange the b-rep volume equals the
analytic value; the best mesh tessellation tried (9,252 triangles) is off by
−0.0016 %. CAD export reports which of the two you are holding (
eksak) and by how much the approximation misses. - The kernel's
ok: trueis not accepted as proof. A fillet larger than half the smallest edge came backokwith a broken solid whose volume grew by 1,971 mm³ on a 6,000 mm³ box. Independent checks reject it. - Physics. Free-fall time matches h = ½gt² within one simulation step at 30, 60 and 240 Hz, and the error shrinks as the step shrinks — the test guards the direction, so it cannot pass on a lucky timestep.
- Compressed files. A Draco-compressed sphere receives the same certificate as its uncompressed twin: 2,208 triangles, 0 failures, 6 warnings.
- Hostile files. GLBs with node cycles, out-of-range indices, forged accessor counts or oversized skins are rejected with a message naming the defect, instead of hanging or passing. Each case runs in a child process with a time limit, so a regression fails the suite instead of freezing it.
Command-line gate
npx -p rupa3d rupa periksa model.glb
Exit code 0 — passes every required rule. 1 — fails a required rule (fix
the asset). 2 — could not be checked (fix the tool or the input).
--json for machine output, --spek for another spec, --tempel to write a
certified copy.
Develop
npm install
npm test
297 tests run against real Blender, OpenCascade and Rapier — not mocks — and
one suite talks to the server over real MCP stdio, including from a foreign
working directory the way an MCP client launches it. Tests that need a local
asset are skipped with the reason and how to obtain it; node contoh/flange-cad.mjs rebuilds the flange fixture in about 40 seconds without
Blender.
Limitations
- Tool descriptions, messages and most documentation are in Indonesian.
- Tested on Windows 11 only. macOS and Linux are untested.
rupa_skripruns arbitrarybpyPython inside Blender. That is the modeling capability, not a bug — but do not expose the server to untrusted input over a network.- Hardening against hostile files is partial: there are no general input size limits and no process isolation yet.
- It is not a replacement for Blender or Spline today.
License
MIT. Dependencies keep their own licenses — notably brepjs-opencascade
(LGPL-2.1-only). The scripts in bpy/ run inside Blender.
Documentation (Indonesian)
| docs/INTEGRASI.md | using Rupa3D from outside: library, MCP server, and reading the certificate without installing anything |
| docs/SERTIFIKAT.md | specs and certificates |
| docs/BERKAS.md | checking other people's GLB files without Blender |
| docs/CAD-MCP.md · docs/SKETSA.md · docs/TAHAP-B-BREP.md | b-rep CAD over MCP, and 2D sketch → solid |
| docs/FISIKA.md · docs/ADEGAN.md | physics, scenes and the web runtime |
| docs/TOPOLOGI.md · docs/TEKSTUR.md · docs/DRACO.md | topology, textures, compressed files |
| docs/PERAKIT.md · docs/OPTIMASI.md | the one-call asset pipeline, and performance |
| CHANGELOG.md | every release — including a Terbongkar ("exposed") section for what broke, measuring tools included |
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