How to make player body parts non collideable

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#1

Im trying to make the player’s body parts non collideable while there’s a body velocity inside the player’s humanoid root part

local bv = Instance.new("BodyVelocity", hrp)
bv.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
bv.Velocity = hrp.CFrame.LookVector * 200
			
local ghostPlayer = coroutine.create(function()
				
	while wait() and hrp:FindFirstChild("BodyVelocity") do
				
		for i, v in pairs(char:GetChildren()) do
					
			if v:IsA("BasePart") then
							
				v.CanCollide = false
							
			end
					
		end
					
	end
				
end)
			
coroutine.resume(ghostPlayer)
			
wait(0.3)
			
bv:Destroy()

Doesn’t work tho, the player is still collideable

#2

Do you just want the ghost player to not collide with other players, or do you want it truly to collide with nothing? Either way the answer lies with collision groups in PhysicsService. You can assign objects to separate groups and then set the groups to not be collidable with each other, or even not collidable with themselves.

#3

I guess it would be better if it only didn’t collide with players, so you can’t go inside mountains, etc

#4

You can use PhysicsService to change the collision group of all of the player’s parts.

local PhysicsService = game:GetService("PhysicsService")
PhysicsService:CreateCollisionGroup("Ghost")
PhysicsService:CollisionGroupSetCollidable("Default", "Ghost", false)
PhysicsService:CollisionGroupSetCollidable("Ghost", "Ghost", false)

local function ghostPlayer(player)
	for index, part in pairs(player.Character:GetDescendants()) do
		if part:IsA("BasePart") then
			PhysicsService:SetPartCollisionGroup(part, "Ghost")
		end
	end
end
-- to unghost, do the same thing just with the 'Default' group

This will make the player collide with absolutely nothing, including the ground they’re standing on. If you want the player to only be able to phase through selective parts such as walls, you would need to create a new CollisionGroup and assign all of those parts to the group. If this is the approach you want, I would suggest using CollectionService paired with Tiffany’s Tag Editor to make it easier to select the parts you want the player to be able to phase through.

#5

okay i think i understand, could i do this:

local PS = game:GetService("PhysicsService")
PS:CreateCollisionGroup("Player")
PS:CreateCollisionGroup("Ghost")
PS:CollisionGroupSetCollidable("Player", "Ghost", false)
PS:CollisionGroupSetCollidable("Default", "Ghost", true)
PS:CollisionGroupSetCollidable("Default", "Player", true)
PS:CollisionGroupSetCollidable("Player", "Player", true)

---------------------------------------------------------------------

game.Players.PlayerAdded:Connect(function(plr)
	
	plr.CharacterAdded:Connect(function(char)
		
		for i, v in pairs(char:GetChildren()) do
			
			if v:IsA("BasePart") then
				
				PS:SetPartCollisionGroup(v, "Player")
				
			end
			
		end
		
	end)
	
end)

then when i put a player’s body parts inside the Ghost group it won’t collide with player but it will with default stuff?