Inconsistent CollisionGroup behavior

Bug Reports Engine Bugs
,
#1

Setting a part’s CollisionGroup to a collision group that has not been created in Studio has inconsistent behavior on mobile compared to PC.
In Studio and live game, the collision group collides with everything, while on mobile it does NOT collide with anything.

Code sample used:

local Players = game:GetService("Players")

local function onDescendantAdded(descendant)
	-- Set collision group for any part descendant
	if descendant:IsA("BasePart") then
		descendant.CollisionGroup = "Characters"
	end
end

local function onCharacterAdded(character)
	-- Process existing and new descendants for physics setup
	for _, descendant in character:GetDescendants() do
		onDescendantAdded(descendant)
	end
	character.DescendantAdded:Connect(onDescendantAdded)
end

Players.PlayerAdded:Connect(function(player)
	-- Detect when the player's character is added
	player.CharacterAdded:Connect(onCharacterAdded)
end)

(I forgot to actually create the Characters collision group)

PC specs:

  • Ryzen 7 5800x3D
  • GTX 1660 Ti
  • 16gb RAM

Mobile: (Not mine, unable to provide more info, but seems to also happen for other users)

  • Amazon Fire HD 10

Expected behavior

I would expect the behavior to be the same between device types.
An additional warning or error for unregistered collision groups would be nice too.

2 Likes
#2

Thanks for the report! I filed a ticket in our internal database.

1 Like
#3

Thanks for reporting! This is a duplication of Kindle Fire users capable of walking through objects. For future update, please refer to that post. Thanks!

1 Like