Can I change the physics engine of webots?

[zapplelove]

There are many other engines like bullet, simbody, Isaac or raisim, they are more efficient in some area. And can I change the physics engine like Gazebo?

[omichel]

Currently Webots supports only its own version of ODE.
However, implementing an interface to a different physics engine is doable, but require some development.
Feel free to contribute if you are interested.