I find out that at the start of the game my pawn with gravity enabled always have a large velocity given by the gravity and sometime would penetrate the floor. From logging, it looks like the velocity and position updates doesn’t happen at first but the pawn would accumulate the gravity and apply it after a relatively large time step. (It looks like the update happens at the first frame)
I am wondering how to let position and velocity update happening as normal when the game start?
Sorry that I just figure out what happens. It looks like it concerns the max physics step. I was trying to use the asyn physics but found that the applied force would be accumulated and be applied at a large time step at first without setting the max physics step. (I guess it is at the time of the first physics step and I didn’t do the asyn physics properly) So I just give up the asyn physics and use the max physics step setting.