GameRPC problem (SetTransform)

[Pinguu-dev]

Introduction

As soon as the transform is changed by a player next to another player, the game RPC is called for both players. However, the server only claims to have sent it to the "right" player.

Reproduction
Simply teleport to a coordinate. However, both the target and the executing player must be streamed. So it's best to just increase Z by 20, you will take the other player with you.

Video
https://www.youtube.com/watch?v=OIvaGBLa3IQ

The first player spawns which performs an entity:setPosition, and the second player is also teleported there.
(ignore the lags, other issue from us^^)

Ideas
Based on my own instinct, I would say that a game RPC is currently sent to every player. \o/

[zpl-zak]

As per discussion on Discord:

SetTransform is sent to all players in proximity of targeted entity, therefore the mod-level client code has check for which client-side entity this packet arrives.

If entity handle == local player entity handle, this RPC was aimed at us, so we can utilise game sdk to update internal transform of our local player. Otherwise, we've received an update for a remote entity and as such we should update their transform almost just like we do whenever a ticked update packet msg arrives (we should also reset interpolator here).

We send this message to proximity players so they're aware a given entity has changed its transform server-side. This is very important for entities like vehicles that would otherwise rubber band or worse, get stuck at the original transform, just due to timing issues (ie. player already sent us a new now invalid transform).

Closing this as this is not an issue, but worth keeping for future reference, thanks for bringing this up!