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Agents infer Lego mechanisms from sources, then animate them

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Hi there :)Around a month ago, I released LDraw Nova, an agentic toolset for assembling LEGO CAD models by generating LDraw source code files.For more details, here's the Show HN post:https://news.ycombinator.com/item?id=49937916From the comments, I got the impression that there was quite an interest in seeing not only AI-generated LEGO models, but also AI-animated LEGO ones.I took a look at results from past experiments, and found it feasible to use agentic LLMs for:- analyzing the LDraw source code for LEGO models - reverse-engineer! the mechanisms present by reading the descriptions and sequence for the parts there - and then, animate them via Blender!This new project I'm presenting, LDraw Mecha, is the end result and proof that can be done:- Read specially annotated LDraw LEGO models .mpd source files - Infer the model structure in terms of submodels - Select from those the ones that are mechanisms - Plan animations - Execute them in BlenderIn summary, from an initial .mpd source file, get a rigged and animated version for the model as a Blender (.blend) file.See the results here:- Repo (v0.5.0): https://github.com/anteloc/ldraw-mecha/tree/v0.5.0 - Gallery: https://github.com/anteloc/ldraw-mecha/blob/v0.5.0/GALLERY.m... - Process: https://github.com/anteloc/ldraw-mecha/blob/v0.5.0/PROCESS.m...This project is very unusual, I'd really appreciate some feedback from the community.Cheers!

HN · launched Nov 6, 2026 · 31 upvotes (top 23%) · 0 views

Niche: ai 3d and animation generators · 120 launches, 8 in the last 7 days · Explore this niche →

Category and tags

  • Horizontal
  • Content generation
  • AI-native
  • Hobby / open-source project

Visit website ↗ Source listing ↗

Could you build this?

Partial The LEGO CAD and animation layer is buildable with LDraw tooling and agents, but inferring working mechanisms from source material and simulating them physically needs specialized kinematics and modeling work.

What it would actually take: The stack would combine the open LDraw part library and format with an agent that generates LDraw models and a kinematics or physics solver to animate them. The hard parts are reliable mechanism inference from source material and making joints and constraints physically plausible. That requires robotics or mechanical-simulation knowledge and some testing against real builds.

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Competitors

Other products that read as similar to this one : 432 launches clear the similarity bar, closest 8 shown.

Attention rank: #125 of 433 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 373 days after the earliest competitor.

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