PyBullet and Bullet 2.89 with FEM deformables, PyBullet deep_mimic and Laikago

[bullet_team]

Note we are making regular Pybullet releases but don't make announcements here every time.
You can see the PyBullet release history here.

Bullet 2.89 includes a new implementation of volumetric deformable objects and cloth based on the Finite Element Method, thanks to Xuchen Han. Two-way coupling between deformables and rigid/multi body is achieved using a unified constraint solver.
Download the release here: https://github.com/bulletphysics/bullet3/releases

PyBullet is improved for robotics sim-to-real with realistic models of Laikago quadruped and an implementation of Deep Mimic.

[Mark97]

do FEM deformables have options for complex contact models, like nonlinear stiffness, and permanent deformation / viscosity?