How to tell which direction a player is moving across an object

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#1

I’m scripting a skating game, and to make a grinding system, I need to detect which direction the player is moving across the rail

After I detect which direction they’re going across the rail, I can lock the player onto the rail

The video above shows me trying to go straight on the rail (pretty difficult to do at the moment)

#2

My first thought would be to use the lookVector of the HumanoidRootPart, but I have no idea where to begin with this

#3

Humanoid.MoveDirection gives u the direction that the player is trying to move towards

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#4

https://developer.roblox.com/en-us/api-reference/property/Humanoid/MoveDirection

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#5 
			if OnRail then
				local HRPlookVector = HRP.CFrame.lookVector
				local RailForward = Rail.CFrame.lookVector -- rail's lookvector
				local RailBackward = Rail.CFrame.lookVector * -1 -- rail's backvector
				
				if (HRPlookVector - RailForward).Magnitude < (HRPlookVector - RailBackward).Magnitude then
					print("Right")
					GrindDirection = "Right"
				else
					print("Left")
					GrindDirection = "Left"
				end
				
			else
				GrindDirection = nil
			end

I wasn’t quite sure how to use MoveDirection in this context, but I did figure this out eventually. I checked the magnitude between the HumanoidRootPart’s lookVector and the rail’s lookVector

If Humanoid.MoveDirection can provide a more efficient or accurate way to detect the direction the player moves across the rail, I’m open to change