LogoSC - A Logo interpreter for OpenSCAD

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  Project Logo created using the project

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  Example Gallery running in OpenSCAD

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  Example Gallery Detail

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  Regression suite output

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  Debug mode - detail

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  Debug mode - general (note issue with crossed line)

Inspiration

LogoSC began with a practical OpenSCAD problem: custom 2D profiles are often represented as long lists of coordinates. Those lists describe where points are, but not the designer’s intent, and they become difficult to maintain when shapes contain repeated features, holes, angles, or dimensional variations. Logo turtle graphics has a clearer approach: describe how a virtual turtle moves around the shape using commands such as MOVE, TURN, and REPEAT. LogoSC brings that model to OpenSCAD, producing reusable 2D regions that native OpenSCAD tools can extrude and combine into 3D models.

How I built it

I developed LogoSC primarily during evening hours over about two and a half weeks. It evolved from a small turtle interpreter into a documented geometry library with curves, holes, reusable command lists, visual debugging, optional path validation, examples, and numerous regression checks. ChatGPT helped explore designs and write early code and tests. Codex later worked directly in the Git repository, inspecting files, implementing focused changes, running OpenSCAD from the command line, and keeping tests and documentation synchronized.

Challenges

OpenSCAD is declarative and functional: variables are not conventionally mutable, expressions may be reevaluated, and modules do not behave like imperative procedures. Recursion, list processing, error handling, polygon construction, and test aggregation therefore required unusual design patterns. Geometry also creates a testing challenge: code can execute successfully while producing the wrong shape. LogoSC combines automated invariant checks with visual example, debug, and regression galleries.

What I learned

The biggest lesson was that durable AI-assisted development requires durable project state. Conversation history alone is not enough. LogoSC uses Git, tests, architectural notes, explicit conventions, restart instructions, and written design rationale as persistent project memory. A fresh Codex task can read that repository, reconstruct the project’s state, verify its assumptions, and resume useful work within minutes.

Built With

• agents.md
• codex
• logo
• openscad