# Description

<!--
Thank you for your interest in sending a pull request. Please make sure
to check the contribution guidelines.

Link: https://isaac-orbit.github.io/orbit/source/refs/contributing.html
-->

Previously the `make_plane` function was always offsetting the terrain
origin such that the origin of the plane coincides with (0, 0). This was
done because when adding a ground plane, we wanted the origin to match
the simulation origin. However, it introduced a bug in sub-terrain
generator where we assume that all sub-terrains are origin at (size_x *
0.5, size_y * 0.5).

The PR fixes this issue by making an explicit argument to `make_plane`
called `centered`. Also adds comments to make it clear what the
sub-terrain generator and terrain importer does.

<!-- As a practice, it is recommended to open an issue to have
discussions on the proposed pull request.
This makes it easier for the community to keep track of what is being
developed or added, and if a given feature
is demanded by more than one party. -->

## Type of change

<!-- As you go through the list, delete the ones that are not
applicable. -->

- Bug fix (non-breaking change which fixes an issue)

## Screenshots

| Before | After |
| ------ | ----- |
|
![bug](https://github.com/isaac-orbit/orbit/assets/12863862/1ce9db23-b97b-44d9-8a4e-1c543eab914b)|
![fix](https://github.com/isaac-orbit/orbit/assets/12863862/b347077b-daa6-4d76-a307-4e97450ccce9)
|


## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file

<!--
As you go through the checklist above, you can mark something as done by
putting an x character in it

For example,
- [x] I have done this task
- [ ] I have not done this task
-->