Hello, I am trying to implement the right way of making PrimaryPart of train to face the right way, and then I want to lerp it. The problem is that in the code there is currently one lerp function, and I because I am new to CFrames I am not sure how to implement it. I am trying to implement it on lines 86-93
Here is the current code.
local trainoff = Vector3.new(1,9,0)
local offpos = trainoff + Vector3.new(0,0,script.OffZ.Value)
for i,v in pairs(script.Parent.Cars:GetChildren()) do
local PrimaryPart = script.Parent.Cars["Car"..i]
PrimaryPart:SetPrimaryPartCFrame(CFrame.new(workspace.Tracks.Start.PrimaryPart.Position + offpos))
offpos = offpos + Vector3.new(0,0,script.Parent.Cars["Car"..i].Box.Size.Z)
end
--- Train Script Below
local RunService = game:GetService("RunService")
local Grinding = true
local function GetDist(p)
return (p.Node1.WorldPosition - p.Node0.WorldPosition).Magnitude
end
local function GetNewPosition(p, a)
return (p.Node1.WorldPosition - p.Node0.WorldPosition) * a + p.Node0.WorldPosition
end
local function GetNewNode(currentNode, dir)
return currentNode.Part.NextNode.Value
end
local function GrindRail(Train, RailParts, CurrentPart)
--AlignPosition.Attachment1.Position = AlignPosition.Attachment0.WorldPosition
local CurrentNode = RailParts[CurrentPart]
--alpha between Node0 and Node1
local a = 0--dist2.Unit:Dot(dist1)/dist2.Magnitude
--All variables should be found by now!
--AlignPosition.Enabled = true
local connection
local CurrentRatio = GetDist(CurrentNode.Part)
connection = RunService.Heartbeat:Connect(function(dt)
a = a + dt*script.Speed.Value/CurrentRatio
print(a)
if a > 1 then
repeat
local newPart = GetNewNode(CurrentNode, 1)
if newPart then
CurrentNode = RailParts[newPart]
local NewRatio = GetDist(newPart)
a = a - 1
a = a * NewRatio/CurrentRatio
CurrentRatio = NewRatio
else
connection:Disconnect()
break
end
until a <= 1
elseif a < 0 then
repeat
local newPart = GetNewNode(CurrentNode, -1)
if newPart then
CurrentNode = RailParts[newPart]
local NewRatio = GetDist(newPart)
a = a + 1
a = a * NewRatio/CurrentRatio
CurrentRatio = NewRatio
else
connection:Disconnect()
break
end
until a >= 0
end
if CurrentNode and Grinding then
local dir = (CurrentNode.Part.Node1.WorldPosition - CurrentNode.Part.Node0.WorldPosition).Unit
--[[Train.PrimaryPart.CFrame = Train.PrimaryPart.CFrame:Lerp(CFrame.new(
GetNewPosition(CurrentNode.Part,a) + Vector3.new(0,10,0),
GetNewPosition(CurrentNode.Part,a) + Vector3.new(0,10,0) + dir
), 0.1)--]]
for i,v in pairs(script.Parent.Cars:GetChildren()) do
local car = script.Parent.Cars["Car"..i]
-- print(getdistancetonode(currentpart,dir,i))
-- print(i)
--print(ii.." "..i)
local offpos = trainoff + Vector3.new(0,0,script.OffZ.Value)
-- I need to edit this block below
car:SetPrimaryPartCFrame(CFrame.new(
car.PrimaryPart.Position
):Lerp(CFrame.new(
GetNewPosition(CurrentNode.Part,a) + offpos + Vector3.new(-1,0,73.41*i),
GetNewPosition(CurrentNode.Part,a) + offpos + dir + Vector3.new(-1,0,73.41*i)
), 0.1))
offpos = offpos + Vector3.new(0,0,73.41*i)
wait(0.001)
end
wait(1/script.Speed.Value)
--AlignPosition.Attachment1.Position = GetNewPosition(CurrentNode.Part,a) + Vector3.new(0,3,0)
else
--AlignPosition.Enabled = false
wait(2)
Grinding = false
end
end)
end
wait(1)
print("waiting for setup...")
wait(2.3)
print("ready!")
local train = script.Parent
local RailParts = {}
local RailModel = workspace.Tracks
for _, part in ipairs(RailModel:GetChildren()) do
RailParts[part.PrimaryPart] = {
Part = part.PrimaryPart
}
end
GrindRail(train, RailParts, workspace.Tracks.Start.PrimaryPart)
Your help is much appreciated.
@sasial I think that you might be interested so I pinged you 
