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Documenting the difference in quaternion representation between MuJoCo and Drake

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
35/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Stale
Tech stack
python

Research direction

The issue provides links to the MuJoCo and Drake quaternion documentation but names no repository file. Start by locating the project's documentation or rotation-conversion entry point, then document the [x, y, z, w] versus [w, x, y, z] ordering; the work is done when the conversion difference and both references are clearly recorded.

Written by the indexing model from the issue text.

Description

API differences need to be noted when converting rotations between the simulator and the controller. For example,

  • MuJoCo API uses an [x, y, z, w] quaternion representation as shown here
  • Whereas, Drake uses the [w, x, y, z] ordering as described here
Dominant language
Python
Stars
26
Forks
4
PR merge metrics
No merged PRs in 30d

Getting set up

This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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