2D positioning to 3D positioning

Help and Feedback Scripting Support
#1

Hello! I am working on a GPS system which has been delayed due to me not knowing the math for it. What I want to make is that whenever, and wherever the player clicks in the minimap, it makes a waypoint at that location in the real world. I’ve got some code:

local GPS_BUTTON = script.Parent;

local player  = game:GetService("Players").LocalPlayer
local Mouse = player:GetMouse()

local location = script.Parent.Parent:WaitForChild("Location")

local UserInputService = game:GetService("UserInputService")

local char = player.Character or player.CharacterAdded:Wait()

local humanoid = char:WaitForChild("Humanoid")

local locations = {};

local Camera = game.Workspace.CurrentCamera

local origin = UDim2.fromScale(0.5, 0.5)

humanoid.Touched:Connect(function(hit)
    if hit.Name == "GPS" then
        hit:Destroy()

        for index, location in ipairs(locations) do
            location:Destroy()
        end

        locations = {}
    end
end)

GPS_BUTTON.MouseButton1Click:Connect(function()
    if game.Workspace:FindFirstChild("GPS") then return end

    local relPos = Vector2.new(Mouse.X,Mouse.Y)-GPS_BUTTON.AbsolutePosition -- relative position in pixels
    local scale = relPos/GPS_BUTTON.AbsoluteSize -- relative position in scale
    
    scale = UDim2.new(scale.X, 0, scale.Y, 0)

    local newLo = location:Clone()

    table.insert(locations, newLo)

    newLo.Visible = true

    newLo.Position = scale

    newLo.Parent = location.Parent

    local anotherLo = newLo:Clone()

    anotherLo.Visible = true

    anotherLo.Size = UDim2.new(0.116, 0,0.111, 0)

    anotherLo.Position = scale

    anotherLo.Parent = GPS_BUTTON.Parent.Parent.Frame.Map

    table.insert(locations, anotherLo)
    
	local PART = Instance.new("Part")
	
	local desiredWorldPosition = Vector3.new()

	local relX = (newLo.AbsolutePosition.X - origin.X.Scale)
	local absX = (game.Workspace.Terrain.Size.X * 0.5)
	
	local relZ = (newLo.AbsolutePosition.Y - origin.Y.Scale)
	local absZ = (game.Workspace.Terrain.Size.Z * 0.5)
	
	desiredWorldPosition = Vector3.new(relX/absX, 5, relZ/absZ)
	
    PART.Size = PART.Size + Vector3.new(0, 20, 0)

    PART.Position = desiredWorldPosition -- Dunno 

    PART.Anchored = true

    PART.Parent = game.Workspace

    PART.CanCollide = false

    PART.Transparency = 0.5

    PART.Name = "GPS";
end)

But it always positions the part at 1 position no matter where I click in the minimap.

Stuck at this for a while now.

Any help that solves this will make my day. Thank you.

#3

I have a representation of the position in a 2d identity matrix then have that being updated based on the bounds of the map divided by the players position

#4

What do you mean? Mind explaining a bit more?

#5

Screen Shot 2021-02-03 at 8.15.48 AM
Screen Shot 2021-02-03 at 8.15.48 AM1270×974 91.1 KB

Do you get what I mean now? The more components in the matrix → the resolution/accuracy of the 2d positioning to 3d positioning. Technically this should be an infinitly wide matrix but idk much about graphing so we are using set bounds

#6

If I’m not wrong, then, is the “xLength” also a “xFactor”? Because I use them when I position the player position in the map.

#7

xLength → the length of the bounds of our map on the x

#8

Oh. Thank you! Also, how would I use to convert a certain position on my map to 3D?
Sorry if this annoying…

#9

Well we dont really know the y factor. What we can do I guess is have a ray cast down when they call it at that position (by just using the inverse operation of our formula) and see where it hits, then apply like idk a 5 stud offset on the y to that

#10

Don’t really care about the Y one. All I want is the X and Z.

Ok so imagine this is my 2D position:

local TwoD = UDim2.fromScale(0.5, 0.5)
local BoundsX, BoundsY = 2, 5

local playerPos = someRandomUDim

local ThreeDX, ThreeDZ = ((TwoD.X.Scale/BoundsX)/playerPos.X), ((TwoD.Y.Scale/BoundsY) / playerPos.Z)

local vec = Vector3.new(ThreeDX, 10, ThreeDZ)

Is the “vec” the correct position?

#11

you cant rely on the actual gui position, instead use the matrix as the reference. The gui is just the interpretation of our matrix visually

1 Like
#12

How would I get the matrix? Thanks for your help so far!

#13

A matrix is just a table within a table in a sense. I suggest you watch my video on them

#14

Thank you so much, I have another question. Do I get the matrix of the playerPosition on the GUI or the one in world space?

#15

The gui isnt manipulating the matrix nor is the worldspace. The matrix is there as a way to interpret the data. The gui and worldspace are also ways but you can think of the matrix as like the base interpreter

#16

Oh, I get it now. If I need any help, will you be active?

#17

Class man :roll_eyes: I might be able to get on between classes but I’ll be out in like 5 hours

#18

Ok, thank you. Mind adding me on discord?