How to lerp at a constant speed?

[mikolpplO_o2000]

I wanted to make a more optimized system for moving zombies in my td game but i don’t know how to lerp at a constant rate.

local CurrentCF = EnemiesTable[i].CF
local StartCF = Path.CFrame*CFrame.new(0, 1, Path.Size.Z/2-1)
local EndCF = Path.CFrame*CFrame.new(0, 1, Path.Size.Z/-2+1)
					
if  math.round(CurrentCF.X) == math.round(EndCF.X) and
	math.round(CurrentCF.Z) == math.round(EndCF.Z)
then
	EnemiesData[i].Waypoint += 1
end

local ZombieMag = (EndCF.Position - CurrentCF.Position).Magnitude/TrackMag
local duration = ZombieMag / EnemiesData[i].Speed
					
local target = CFrame.new(CurrentCF:Lerp(EndCF, duration).Position) * CFrame.fromEulerAnglesXYZ(EndCF:ToOrientation())

[ww_waylon09]

You need to lerp the start CFrame and the end CFrame without changing the start CFrame. The reason that lerp isn’t constant is because the start is changing whenever the zombie moves. You could try something like this to fix the problem:

local target = CFrame.new(StartCF:Lerp(EndCF, duration).Position) * CFrame.fromEulerAnglesXYZ(EndCF:ToOrientation())

[mikolpplO_o2000]

i changed it to that and its sending a zombie to 0, inf, 0

local duration = (EndCF.Position - CurrentCF.Position).Magnitude / EnemiesData[i].Speed
					
local target = CFrame.new(StartCF:Lerp(EndCF, duration).Position) * CFrame.fromEulerAnglesXYZ(EndCF:ToOrientation())		

[mikolpplO_o2000]

Or when i set it to this its just sitting in a place

local TrackMag = (EndCF.Position - StartCF.Position).Magnitude
local ZombieMag = (EndCF.Position - CurrentCF.Position).Magnitude/TrackMag
local duration = ZombieMag / EnemiesData[i].Speed
					
local target = CFrame.new(StartCF:Lerp(EndCF, duration).Position) * CFrame.fromEulerAnglesXYZ(EndCF:ToOrientation())				

[mikolpplO_o2000]

I got it to work with extra stored start time variable

local StartTime = EnemiesTable[i].StartTime
local CurrentCF :CFrame = EnemiesTable[i].CF
local StartCF :CFrame = Path.CFrame*CFrame.new(0, 1, Path.Size.Z/2-Path.Size.X/2)
local EndCF :CFrame = Path.CFrame*CFrame.new(0, 1, Path.Size.Z/-2+Path.Size.X/2)
					
if EnemiesTable[i].StartTime == nil then
	EnemiesTable[i].StartTime = os.clock()
	StartTime = EnemiesTable[i].StartTime
end
					
local Time = (EndCF.Position - StartCF.Position).Magnitude / EnemiesData[i].Speed
					
local alpha = (os.clock() - StartTime) / Time
local CAlpha = math.min(alpha, 1)
					
local target = CFrame.new(StartCF.Position:Lerp(EndCF.Position, CAlpha)) * CFrame.fromEulerAnglesXYZ(EndCF:ToOrientation())
					
if alpha > 0.95 then EnemiesData[i].Waypoint += 1 EnemiesTable[i].StartTime = nil end
					
EnemiesTable[i].CF = target