Collisions groups

[thin crag]

I'm doing a two players obby and I'm setting collisions groups of some players, which is working fine, but I was wondering if there is a way to set a collision group of a part that only exist on the client side, I know you can only use collision groups on the server but can you use it on the client if it's on a client part?

The idea is that I want the two players to have collisions with some objects that are only made on their client's side, but other players can collide with those objects even if for them, they don't exist...

I thought of using run service to make the other player's characters (torso and head) uncollideable but I don't think this would be very slow devices friendly

I don't need a full script detailed, I just need an idea on how to make this work, like I said, I tried some things but none of them really worked...

ping me if you got an idea

[spare reef]

just make 2 copies of the part in both clients, and set its properties as you want

[thin crag]

This is what I did

The issue is that , when one of the player grabs the block, it works fine, but if there is another duo of players that are at the same place as the cube is for you, they will collide with it, altho for them they collide with nothing so they continue moving and it makes it hard to move the block when there are other players that are not in your duo

[thin crag]

the systeme I made is that each client creates the block on their side, and if a player grabs the block and is in a duo, then it replicates the movements to the seconds player in the duo, which works well, I just need to make it so on the client side that has the block, the other players cannot interfer with the block's position

[buoyant heron]

Can you send a vid example?

[thin crag]

sure

@buoyant heron let me record it, it will be a bit laggy perhaps as I need to simulate three players to show you my issue

the video file is too large 💀

how can I send it to you @buoyant heron ?

[spare reef]

use streamable

[thin crag]

wait I'm compressing the video

here you go

so the issue in this video is that the "player1" should not be able to collide with the "player3" and the "player2" block.

[thin crag]

@spare reef what you think ?

[buoyant heron]

Maybe

Turn off collision on all other players

Or make a collision group on the block that won’t collide with other players than the duo

Duo collision group(+block): "Duo"
OtherPlayers: "OtherPlayers"

Duo can’t collide with other players

[thin crag]

yea that is what I thought, but the issue is that the block dosen't exist on the server side, so there is no way to do that

[buoyant heron]

Another idea:

make a folder (I’ll call it main for now)

When a duo is created, make a folder inside main named Plr1Name+Plr2Name.
Make the block inside the folder
A localscript will make that folder removed if you’re not a part of the duo
That way, the block exists on server but only that duo will have the block

Then, make a new collision group for the block and for the players (same one) and make it so the other duos group won’t collide with it
How to:
https://devforum.roblox.com/t/collision-groups-with-scripts/2152867/2

[buoyant heron]

Have a table with all duos collision groups so you can disable em from the new one
Also when a new one is created update all others

[thin crag]

Hey, thank you for your idea, I'm sorry I closed this channel as I found a solution, if you are interested, I simply used "nocollisionconstraints" that I added to all the players's head, torso and hrp that arent part of the duo

so that's a bit the same as using collisions groups, but it also works on client

I just didn't knew those nocollisionconstraint existed

[buoyant heron]

O

Ok 👍

[thin crag]

thank you for your help