it worked, but only when i put the ground with dynamic physic and turn on immovable, that wasn't clear lol, so the physic only work when you put one object with dynamics? put this in the description please , i was totaly lost until know this lol.
You don't need the ground, but for me it feels better to me to have a ground and some fake gravity for a kinematic character controller. You can delete the ground in my example and the 'D' movement still works (but it will be falling due to the fake gravity.)
For some more info about character controllers in general see: https://rapier.rs/docs/user_guides/javascript/character_controller
(This is the physics library embedded in this addon, a subset of the many features are exposed to C3 right now.)