Networked Physics with PhysX

[Blue_man]

@rob422lou;657875

Blue man, what did you end up doing? I’ve been trying to figure out how to rewind, or save/clone a physx scene, or create a new scene that only contains actors, forces, and constraints in a certain area.

I was going to try to set only the server to fixed timestep, and have the clients maintain an old scene. When a client receives position updates with a timestamp attached to it, it takes the old scene and simulates forward until it hits the sent informations timestamp, then updates the positions of the objects in the old scene, and then simulates forward again. But I’ll admit this is far outside my area of experience, so I don’t know if that’d work.

Sorry for the late response, I decided to do everything in the main physics scene because ue4 is not very happy when you move physics bodies between scenes. To replay the physics you have to get the physics scene form the world ( GetWorld() ) and then convert it into PxScene* and when you do that you can call simulate(Time) function on PxScene*. Before you call it you also need to set all the input and call your physics function (your function where you calculate physics). If someone knows how to properly create a new physics scene please let me know, it would be better to do this stuff in a separate scene I think.

It replicates perfectly when the vehicle is driving but when it is in the air it goes out of sync, still need to find way to solve that.