Why do we need check side when interacting with mob/blockentity?

[jissee]

I am a little confused about the field "isClientSide" of Level. I notice that when interacting with a mob or block entity, the interaction only happens if (!level.isClientSide). I wonder what exactly the "clientside" of a level means and why we need to check side before executing the following codes. And what is the differences between two "client" of "level.isClientSide" and "@OnlyIn(Dist.CLIENT)"

[warjort]

https://forge.gemwire.uk/wiki/Sides

[Luis_ST]

in short:

• the most stuff is done server side, except rendering (Screen, Entities) and player input (mouse, keyboard)
• @OnlyIn is vanilla only, do not use it

[jissee]

5 minutes ago, Luis_ST said:

in short:

• the most stuff is done server side, except rendering (Screen, Entities) and player input (mouse, keyboard)
• @OnlyIn is vanilla only, do not use it

Thanks! And what about "FMLLoader.getDist().isClient()" ? Is it only (or mostly) used in mod loading or initialization phase?

[warjort]

Answered in the link. You should use the recommended methods.

Edited July 20, 2022 by warjort

[Luis_ST]

2 minutes ago, jissee said:

Is it only (or mostly) used in mod loading or initialization phase?

it's mostly used for Forge internal stuff,

you can use it if you don't have direct access to an Object which indicates the side (Minecraft, DedicatedServer, Level or Entity),
but i would not recommend to use it, if you want to execute some code on a specific side use one of the DistExecutor methods instead