How to make a part approach the player at a constant speed

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1

So i wanted to make a part constantly approach the player at a constant speed, however i dont know how i would achieve that since lerping and tweening dont work, so i dont know how to achieve this.

function chaser.Nav(currentChaser)
	
	chaser.SetSound(currentChaser)

	local moveTimes = math.random(800, 900)
	
	for i=1, moveTimes do
		if currentChaser.Parent == nil then return end
		
		if not currentChaser.Active.Value then break end
		
		character = player.Character or player.CharacterAdded:Wait()

		local moveMulti = 0.0008
		if character:GetAttribute("Hiding") == true then moveMulti = 0.008 end
		
		task.wait(moveMulti)
		
		chaser.MoveTo(currentChaser)
	end
	
	if currentChaser.Active.Value then
		chaser.Despawn(currentChaser)
	end
	
end

function chaser.MoveTo(currentChaser)
	
	character = player.Character or player.CharacterAdded:Wait()
	
	local moveMulti = 0.015
	
	local chaserPos = currentChaser.PrimaryPart.CFrame:Lerp(character.HumanoidRootPart.CFrame, moveMulti)
	currentChaser:PivotTo(chaserPos)
	
	local hits = workspace:GetPartsInPart(currentChaser.PrimaryPart)
	
	for i, object in hits do
		
		if object.Parent == character and object.Name == "HumanoidRootPart" then
			
			character.Humanoid.Health -= 70
			
			chaser.Despawn(currentChaser)
			
			
		end
	end
end

This is my current code using :Lerp(), however it causes it so that whenever it gets close to the player the part slows down, which i dont really want.
Keep in mind this is a local script.

3 Likes
2

you need to use trigonomerty for that…

what your doing is getting distance and using that to do the speed.
Just get the correct rotation vector and then apply a force in that direction

just ask chatgpt if you cant do the math, Most people struggle with it (even I do sometimes)

1 Like
3

How, exactly, would i start doing something like that? I dont really understand how i could do that.

1 Like
4

theres a function called Cframe:LookAt() that returns a CFrame from 2 vector3 points.
A looks at point B.

Then (using trigonometry)

local c = 2 --distance you want to go in studs
local Dir = ? --the lookAt() function result goes here

and do some math and boom your done

AGAIN ASK CHATGPT I HATE DOING MATH

5

The problem with using lerp or tween for this is that you’re effectively going about the equation backwards, even though they technically work. How a lerp works is that it returns a value between value A and B, the value being determined by the second argument. 0 or 1 return the same value as A or B respectively, and any other number is (x/100)% of B starting from A. This post explains it a little better.

Tween is almost the same thing, except it creates a loop bound to framerate that starts at 0 and then ends at 1 across the time given to complete the tween.

Instead, since your concern is speed rather than percentage, you’ll want to use cframes to direct and position the part, like this.

LoopSpeed = 0.05
TravelSpeed = 5 --//Studs per second.
while true do
	--//First part of CFrame.new specifies position, and the second argument specifies where it is "looking".
	--//Then it is multiplied (how cframes are combined) by the speed to move it forwards.
	CloserDirection = CFrame.new(MovePart.Position,Target.Position) * CFrame.new(0,0,-TravelSpeed /LoopSpeed )

	--//This keeps rotation
	MovePart.Position = CloserDirection.Position

	--//Alternatively, this makes the part face the direction it's moving.
	MovePart.CFrame = CloserDirection
	task.wait(LoopSpeed)
end

You’ll probably also want a magnitude check to make the part teleport to the target directly instead when it’s close enough, otherwise it’d overshoot very slightly.

2 Likes
6

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