Show HN: BricksChat – Generate Lego builds from images, including Technic

A developer released BricksChat, a generative LEGO assembly tool that turns images, 3D meshes or other inputs into buildable LEGO models, including specialized Technic parts. The tool uses an agentic pipeline combining recursive program synthesis, combinatorial diffusion, semantic 3D search and operations on assembly hypergraphs, and supports constrained inventories so users can upload only the parts they own. BricksChat also checks subgraph matches against catalogue builds to flag or enforce originality and prevent copying existing MOCs.

I've been working on generative LEGO assembly models recently, but there are similar projects already, so I wanted to try some harder cases: specialized parts incl. technic , multi-modal prompting incl. using images, 3D meshes or almost any input , constrained inventory so you could upload just parts you have , ensuring physical validity and generating buildable instructions, being able to tweak, modify or rebuild entirely an existing build etc. TL;DR the pipeline got more complex than expected and I ended up with an agentic harness leveraging recursive program synthesis, combinatorial diffusion, semantic 3D search and operations on assembly hypergraphs. Yet I am quite happy with the result. It should be able to handle as well a functional mechanism, LEGO robot, artistic landscape or fancy animal. Most importantly, it also checks for subgraph matches of builds present in catalogue, being able to check and possibly enforce originality and prevent copying existing MOCs. Have fun Comments URL: https://news.ycombinator.com/item?id=50141798 https://news.ycombinator.com/item?id=50141798 Points: 2 Comments: 0