Tool with RopeConstraint teleports character erratically

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#1

Whenever I first equip a tool with a rope constraint attached, it teleports me to a random location. From that point on, if I equip the tool, it moves me very slightly but doesn’t teleport me. Here is an example of what I mean (the first tool I equipped I already equipped before. The second one I have not equipped before):

https://streamable.com/um7x6p

Why is this happening? I’ve narrowed it down to being an issue with RopeConstraints, because if I remove the rope constraints from my fishing rod tool, my character isn’t moved at all. I also noticed that welding the part that is supposed to move freely with the RopeConstraint makes this issue go away.

I need to have the rope constraint because my whole system is set up around throwing the line and detecting when it touches water. I throw the line by extending the rope length and doing some stuff with body forces.

Here is my hiarchy:

What should I do? Is this a physics bug? I’ve been trying to fix this for hours: any help is appreciated.

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#2

So the fix to this was whenever you equip the tool, I enabled the RopeConstraints which I now have disabled by default, then teleporting the part that is supposed to move freely with the rope to the player’s position. Then, after about 0.1 seconds, I enabled the ropes again.

-- on equipped

rod.Hook.CFrame = chr.PrimaryPart.CFrame + Vector3.new(1, 1, 1)
wait(0.2)
rod.Rod.Line.Enabled = true
rod.Rod.FakeLineTwo.Enabled = true
rod.Rod.FakeLine.Enabled = true
#3

I had this same problem with a flail weapon. I had a handle with three ropes attached to three spiky spheres. The best solution I could come up with was indeed disabling the ropes before equipping them and I used a weld constraints between the handle and the spiky spheres. When I got the equipped event, I removed the welds and enabled the ropes again. No hacky delays needed since the spheres followed the handle instantly.

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#4

Here’s the script how I did it. Place the script on the tool as a server script.

local tool = script.Parent
-----------------------------------------------------------------------------
local function getDescendantsByClass(rootInstance, className)
	local descs = {}
	for _,i in ipairs(rootInstance:GetDescendants()) do
		if (i:IsA(className)) then
			descs[#descs + 1] = i
		end
	end
	return descs
end
-----------------------------------------------------------------------------

local welds = {}

local function weldRopes(rootInstance)
	local ropes = getDescendantsByClass(rootInstance, "RopeConstraint")

	for _, rope in ipairs(ropes) do
		rope.Enabled = false
		local weld = Instance.new("WeldConstraint")
		weld.Part0 = rope.Attachment0.Parent
		weld.Part1 = rope.Attachment1.Parent
		weld.Parent = weld.Part0
		welds[#welds + 1] = weld
	end
end

local function unweldRopes(rootInstance)
	for _, weld in ipairs(welds) do
		weld:Destroy()
	end
	welds = {}

	local ropes = getDescendantsByClass(rootInstance, "RopeConstraint")
	for _, rope in ipairs(ropes) do
		rope.Enabled = true
	end
end

-- WELD ROPES BEFORE EQUIPPING IT
weldRopes(tool)

tool.Equipped:Connect(function()
	unweldRopes(tool)	
end)

tool.Unequipped:Connect(function()
	weldRopes(tool)	
end)
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