Collision Group interaction with Tools

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1

I made Fan (it’s a tool) that player can equip and use to push other players. It has a collider with canCollide = false, canTouch = true, and with Touched:Connect it detects if any player is touching collider.

It worked fine until I decided to use CollisionGroups and set TouchEventsUseCollisionGroups = true:

  1. I created two groups: Player and Fan. Fan can collide ONLY with Player group.
  2. I added player to the Player collision group and Fan collider to the Fan group. (Checked it in runtime)
  3. If Fan collision = false, for some reason Touched:Connect doesn’t work anymore. I set it to true for the sake of experiment. It didn’t help with activating event. But I noticed something strange:
    When I start the game to test Fan, its collider collides with the floor part (which is in Default group). I tested that it outside of a tool: Fan collider falls through the ground.

So, I have 2 questions:

  1. Why Touched:Connect didn’t work?
  2. Why does collision happen when collider is inside the tool?

I’m completely confused by this interaction and don’t know how to fix it. I also didn’t find explanation in the official documentation for Collisions, Touch and TouchEventsUseCollisionGroups.

Would appreciate any help.

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2

Parts in separate collision groups that can’t collide with each other cannot trigger touched events in the other group.

3

Yes. But Fan and Players are in collision groups that can collide. That’s the problem. And the fact that Fan collider collides with the floor despite them being in non-colliding groups.

4

oh you might have the collision group glitch. delete all of them and recreate them.

5

Tried to recreate them. Didn’t fix the issue.
Eventually, I gave up and ended up cloning collider into the workspace and welding it to the tool when it’s activated. Works perfectly fine.
I believe there is either a non-obvious interaction of collision groups with tools, or it’s just a bug.

Thanks for answering anyway!