How do i make DotProduct for my car?

Help and Feedback Scripting Support
1

The problem is that my car has a head attached to it, and that it is the DotProduct where its gonna be there. the problem is, i can’t seem to code a dotproduct.

A script would be helpful to give me a easy example for detecting angle for dotproduct.

2

You mean you want to get the dot product of two vectors? FirstVector3:Dot(SecondVector3)

3

no just like, If dotproduct == 0.5 then right, if -0.5 then left, how do i something like that?

4

i need a code example.

30

5

So with an if statement?

local dot = FirstVector:Dot(SecondVector)
if dot > 0.5 then
    -- right
elseif dot < -0.5 then
    -- left
end
8

doesn’t seem to work i don’t know what first vector does and second vector.

12

9

FirstVector is the looking direction of the car
something like car.head.CFrame.LookVector

And SecondVector is the relative position of whatever you want to check
something like plr.Character.PrimaryPart.Position - car.head.Position

10

works but, it keeps printing left

11

Then maybe the head is pointed in the wrong direction.
You can just do car.head.CFrame.RightVector instead.

12

I’m not 100% sure what your trying to do but you could do this with PointToObjectSpace

here is a demo project
PointToObjectSpace.rbxl (34.6 KB)

and this is the script inside the demo project

local target = workspace:WaitForChild("Target").Position
local character = script.Parent

while true do
	local cFrame = character:GetPivot()
	local offset = cFrame:PointToObjectSpace(target)
	if offset.X < 0 then
		print("Turn Left")
	elseif offset.X > 0 then
		print("Turn Right")
	end
	task.wait(1)
end

this will tell you to turn left or right to point towards the target position

and this is how to make a arrow that points to a target
Arrow.rbxl (35.4 KB)

local runService = game:GetService("RunService")
local target = workspace:WaitForChild("Target").Position
local arrow = workspace:WaitForChild("Arrow")
local character = script.Parent

runService.Heartbeat:Connect(function(deltaTime)
	local cFrame = character:GetPivot()
	arrow.CFrame = CFrame.lookAt(cFrame.Position + Vector3.yAxis * 5, target)
end)
13

Not, what i usually wanted but. since im making a NFS game, this is helpful for map indictators where to go. what im trying to do is that the car has a vision 180 degrees vision the other 90 right, the car will steer to the waypoint and other 90 left, so basically what i want is the car to steer its pathfinding way point.

14

you can use atan2 with PointToObjectSpace to work out the angle you need to turn here is a demo
PointToObjectSpace.rbxl (34.7 KB)

and this is the code in the demo

local character = script.Parent
local target = workspace:WaitForChild("Target")

while true do
	local offset = character:GetPivot():PointToObjectSpace(target.Position)
	local angle = math.atan2(-offset.X, -offset.Z)
	local degrees = math.deg(angle)
	
	if math.abs(degrees) > 90 then
		print("Target is behind")
	elseif degrees < 0 then
		print("Turn Right")
	elseif degrees > 0 then
		print("Turn Left")
	end
	print(degrees)
	
	task.wait(1)
end

degrees will go from -180 up to 180 depending on the direction to the target
and angle will go from -pi to pi