Problems with :GetPropertyChangedSignal()

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Here is the code I am using to detect the last time at which a player’s character was moved. This program is run in a local script, which is a descendent of the character. Whenever I move the character, nothing prints and the variable is not updated. No errors are visible in the output, and I can confirm that these lines of code are running. Does anyone know what I’m doing wrong?

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Instance:GetPropertyChangedSignal() or Instance.Changed doesn’t fire for physics related things such as CFrame or Position.

The developer hub recommends just using a while loop

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From the wiki:

This event does not fire for physics-related changes, like when the CFrame , Velocity , RotVelocity , Position , Orientation and CFrame properties of a BasePart change due to gravity. To detect changes in these properties, consider using a physics-based event like RunService.Stepped or BasePart.Touched . A while-true-do loop can also work.

What I would do:

local lastMoved = os.time()
local lastP = script.Parent.Parent.HumanoidRootPart.Position
game:GetService("RunService").Stepped:Connect(function(dt)
	-- Check if the part moved since the last physics step.
	-- (within a certain small deviation, hence the use of FuzzyEq)
	if (not script.Parent.Parent.HumanoidRootPart.Position:FuzzyEq(lastP)) then
		print("moved")
		lastMoved = os.time()
		-- Set up for comparison in the next step.
		lastP = script.Parent.Parent.HumanoidRootPart.Position
	end
end)
2 Likes
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Lovely, how efficient! Thank you.