Is this Multiplayer movement logic correct?

[Rev0verDrive]

@dreph27

I’m definitely having a hard time grasping the actual logistics. I’m going to be spending my free time experimenting with much smaller replication practices, plus including the network simulation for average network so I can have some kind of realistic expectation from the logic in my code. Trying to deterministically replicate on client and server is great, but it’s difficult to know what is actually being replicated by default, and what needs to be manually replicated.

For example, the default ThirdPersonCharacter blueprint has it’s AnimBP controlling the “Running” and “Jumping” via tracking movement. All automatic, and replicated because of the checkboxes “Replicates” and “Replicate Movement” on that character.

The moment you move the control of the Running/Jumping animations out of the AnimBP and into the player controller, you end up realizing that the server does replicate “naturally” to everyone else, and the clients need extra logic.

My biggest issue is that I spent a good week of my free time trying to piece together everyone else’s experience, plus Unreal Docs, all to get an understanding of how replication works at a very basic, fundamental level… and now I’m realizing that the whole “Multicast” thing is not used as often as I thought.

I’m really going to look into how to work with RepNotify and booleans and see if that helps. It makes sense that the RepNotify would be the best because you update it on the client, and it tells everyone “hey, this updated, do this” instead of “hey, everyone, including the guy that sent the update request, update”

At least that’s my laymans understanding.

Capsule Movement Component (CMC)
Basic movement (WASD), Mouse Pitch & Yaw, Jump, and Crouch are the only things that replicate. “IF” you use the CMC functions. Anything beyond that you have to replicate.

Sprinting, custom crouch, prone, swimming, strafe jumping, climbing, speed changes etc you will have to set up your own replication. The most straight forward approach would be to use Booleans as “states” which will/can also be used in the animation BP/Graph/state machines. see previously posted sprint example.

You are more than welcome to DM me or hop on discord if you questions.