Document humanoid model changes in changelog section of its README + minor cosmetic improvements.

PiperOrigin-RevId: 595367344
Change-Id: I17483de71c6cbcf6a66e2fad762cc32f8cbee8b5
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Kevin Zakka
2024-01-03 04:46:13 -08:00
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Humanoid
========
Degrees of Freedom: 27
Actuators: 21
# Humanoid
This simplified humanoid model, introduced in [1], is designed for bipedal locomotion
behaviours. While several variants of it exist in the wild, this version is based on the model
in the DeepMind Control Suite [2], which has fairly realistic actuator gains.
* Degrees of Freedom: 27
* Actuators: 21
<p float="left">
<img src="humanoid.png" width="400">
</p>
## Changelog
* 02-01-2024: Add more keyframes.
* 27-11-2023: Move humanoid geoms to group 1.
* 05-04-2023: Fix typo in texture size.
* 20-09-2022: Use default class for left_upper_arm geom.
* 17-09-2022: Increase offscreen render buffer resolution of the humanoid to 2560x1440.
* 12-09-2022:
* Increased maximum hip flexion.
* Symmetrised shoulder and ankle joints.
* Added hamstring tendons which couple the hip and knee at large flexion values.
* Moved duplicated values into defaults.
* Added two keyframes.
* Improved lighting.
* Changed naming convention.
## References
[1] [Synthesis and Stabilization of Complex Behaviors through Online Trajectory Optimization]
(https://doi.org/10.1109/IROS.2012.6386025).
[2] [DeepMind Control Suite](https://arxiv.org/abs/1801.00690).
![humanoid](humanoid.png)