Having Issues With Consistent 3D Object Movement After Removing Child From Tree Across Clients

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:bust_in_silhouette: Asked By x0mek

Hi everyone, I am struggling with a problem I am having in Godot attempting to create a multiplayer game.

I have a system where inventory is pretty-much physicalized, where you can freely drop and pick-up items. It works great in single-player, but when attempting to transfer the progress into multiplayer it all falls apart.

Code snippet of how items are initialized.

Above is a snippet of my code for initializing objects for both the “server” player and the client player. In my specific case, I am having issues with “Welder” and “Gun1Proper”. (The doors work great because they do not move, so no issues there.)

I started experimenting around with how I could get the welders to transfer over their position, similarly to how the player’s do - simply having a timer setup to automatically send the information to its puppets. (Below is welder.gd).

Code describing timer/3d object movement.

Everything works great until I actually want to pick up an object. Within the code, it’s supposed to remove the object as a child of the scene and add it as a child of the player picking it up (in the Hand slot). The player reaches into the welder using its collider and calls the functions. (Below is also welder.gd)

Code displaying how the tree is rearranged in welder.gd.

However, as soon as this happens, the RPCs for the client who did not pick up the object go haywire. (Below shows the error log for the client that did not pick up the object: get_node: (Node not found: “TestingLevel/1/Head/Hand/Welder” (relative to “/root”).)

Showing the error log for the client that did not pick up the object.

Below is showing the scene tree before the server player picks up the welder, from the other client’s perspective.

Scene tree before another client picks up welder.

Below is showing the scene tree after the server player picks up the welder, from the other client’s perspective.

Scene tree after another client picks up welder.

From the perspective of the connecting client, the welder completely disappears. I am not sure where exactly I am going wrong, or if I completely misunderstand networking in Godot as a whole. I would ideally like the welder to be simply picked up and shown in its new position in the hand, even if its parents or positions within the scene tree have moved. To be honest, I am not even sure where to even begin solving this problem, I would appreciate any tips or tricks from anyone. I’m completely stumped. Thanks in advance!