One Sentence Gets Codex Rendering 3D Scenes in Blender
A short prompt pointing a coding agent at an already-installed Blender.app on macOS lets it script and render 3D scenes without any dedicated Blender integration or MCP server.
What it is
A TIL by Simon Willison showing that ChatGPT Codex can drive the full desktop Blender application on macOS just by being told where it lives.
What it does
Telling the agent to 'use the already installed /Applications/Blender to render a scene of X' is enough for it to write and run Blender's Python scripting API and produce a rendered image, no special plugin required.
Why it matters
Instead of building or installing a dedicated Blender MCP server, pointing a coding agent at any already-installed GUI app's CLI or scripting interface can be enough, a pattern that generalizes past Blender to other apps with a scripting API.
How to use it
Install the full Blender app from blender.org, then prompt your coding agent with something like 'Use the already installed /Applications/Blender to render a scene of a pelican riding a bicycle' and iterate from there.
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