Depending on your operating systems language you might need to export the numeric type so that rviz can read the floating point numbers in the robot model correctly:
```
export LC_NUMERIC="en_US.UTF-8"
```
Otherwise, the robot will appear in rviz in a collapsed state.
You can see the full explanation in my [blog post](https://erdalpekel.de/?p=55).
You can see the full explanation in my [blog post](https://erdalpekel.de/?p=55).