Spline with moving part

[pasdalover]

1. What do you want to achieve? Moving a part along a spline

2. What is the issue? I have no idea how

I have tried some solutions but they look extremely glitchy

Just looking for pointers in the right directions

[Scottifly]

Are you talking about a mechanical spline?
If the spline and the Part are going to be connected try using a PrismaticConstraint and set it to Servo so you can select what points the Part moves to.

[pasdalover]

Oh I meant one of these splines

[ImSimplyAnna]

The first thing that comes to mind when I see this is Bézier Curves. The underlying idea is that you linearly interpolate from P0 to P1, then P1 to P2, P2 to P3, and so on until you reach the last point. This gives you a new set of points, and you repeat this process until you have only one point left:

Here’s a relatively simple function I wrote for this purpose a while back:

--Bezier curve
--Essentially a linear interpolation between points, recursively, until only one point remains
function getBezier(points, progress)
	--Calculate number of final points and prepare an array for them
	local points = points
	local nPoints = #points - 1
	
	--Reduce number of points until there's only one left
	--With only one remaining point, nPoints will be 0 since it's
	--the number of points to be stored in the next iteration
	while (nPoints > 0) do
		local pointsOut = table.create(nPoints, Vector3.new())
		local i
		for i = 1, nPoints do
			--Get points
			local p0 = points[i]
			local p1 = points[i+1]
			
			--Store linearly interpolated point
			pointsOut[i] = p1*progress + p0*(1-progress)
		end
		
		--Store new points and number of points for the next iteration
		points = pointsOut
		nPoints = nPoints - 1
	end
	
	--Return the last point
	return points[1]
end

Hopefully this helps!