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Show HN: Posecode, a text language and renderer for human movement

Posecode, a text language and renderer for human movement, has been released on Show HN. The language uses commands like ground-lock, reach, pin, grip, and cue to animate movements such as deadlifts or stretches, with an LLM prompt available to generate valid .posecode documents.

read1 min views1 publishedJul 21, 2026
Show HN: Posecode, a text language and renderer for human movement
Image: source

1 Copy the prompt. Click Copy LLM prompt (top right). It teaches a capable model how to write the Posecode language.

2 Ask an LLM for a movement. Paste the prompt, then ask for what you want: “write a deadlift”, “a hamstring stretch”, “cat-cow”. For a representable request, it should reply with only the raw .posecode

document.

3 Paste it here. Drop the raw .posecode

text into the editor on the left. Valid documents animate; parse errors, range clamps, and unresolved reach targets appear below the editor.

Authoring reference

The [language specification](/spec.html) is the normative
Posecode contract. The [LLM guide](/llm-guide.html) is a

self-contained authoring aid built from that contract.

ground-lock

preserves an existing floor support; reach

moves a limb; pin

moves the whole body around one anchor; and grip

solves hands onto a bar or rails. A cue

is display-only coaching text and never changes the animation.

The prompt you’ll paste into the LLM

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