Converting 3D LookVector to a 2D frame

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#1

I’m making a radar for a game and I’ve done all the basic things but I’m not good at math and don’t know how to show a players LookVector on the radar. I basically just want a line extending 10-20 studs from the middle of the playerdot in the direction they are looking at.

local DeltaPos = Camera.CFrame:PointToObjectSpace(RootPart.Position)
local DotPos = Vector2.new(DeltaPos.X + RADAR_SIZE / 2 + RADAR_PADDING, DeltaPos.Z + RADAR_SIZE / 2 + RADAR_PADDING)
local LookVector = RootPart.CFrame.LookVector
		
local X = math.clamp(DotPos.X, RADAR_PADDING, RADAR_SIZE + RADAR_PADDING) * RADAR_SCALE
local Y = math.clamp(DotPos.Y, RADAR_PADDING, RADAR_SIZE + RADAR_PADDING) * RADAR_SCALE

To create the player dot position all I do is UDim2.new(0, DotPos.X, 0, DotPos.Y)

image

#2

In the same way you used CFrame:PointToObjectSpace(Vector3),
you can use CFrame:VectorToObjectSpace(Vector3) and disregard the Z component.

local RelativeLookVector = Camera.CFrame:VectorToObjectSpace(RootPart.CFrame.LookVector)
local DirectionOnMap =Vector2.new(RelativeLookVector.Y, RelativeLookVector.X))
#3

Thank you, I’ll try this (word limitttttttt)

#4

It points to the corner of my screen instead of showing where they’re looking
image

#5

You’ll need to add the DirectionOnMap to the Dot’s position, since the direction is just a vector from (0, 0)

#6

like this?

local DeltaPos = Camera.CFrame:PointToObjectSpace(RootPart.Position)
local DotPos = Vector2.new(DeltaPos.X + RADAR_SIZE / 2 + RADAR_PADDING, DeltaPos.Z + RADAR_SIZE / 2 + RADAR_PADDING)
local LookVector = RootPart.CFrame.LookVector
		
local X = math.clamp(DotPos.X, RADAR_PADDING, RADAR_SIZE + RADAR_PADDING) * RADAR_SCALE
local Y = math.clamp(DotPos.Y, RADAR_PADDING, RADAR_SIZE + RADAR_PADDING) * RADAR_SCALE
		
local Test1 = Camera.CFrame:VectorToObjectSpace(RootPart.CFrame.LookVector)
local Test2 = Vector2.new(Test1.Y, Test1.X)
local Test3 = Vector2.new(X, Y) + Test2
1 Like
#7

This seems to be working thank you for the help!

#8

I do have a question though why do the lines sometimes get smaller when the players turn?

#10

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