Trying to get a 3D GUIs 2D screen positions

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#1

Any idea how to do this please? I tried using AbsolutePosition, but that just gives it in relation to 0,0 position of its SurfaceGui. I also quickly looked into trying to extrapolate it from WorldToScreenPoint, but the math involved in that would be fairly time consuming.

Anyone have any better ideas please?

Just to clarify I have an image label in on a surface GUI, no billboard GUIs

#2

After much toil, I figured out a hacky solution if the cards are aligned on the XAxis (i.e They arenā€™t rotated and youā€™re looking straight at 'em)

Excuse the horrible variable naming scheme, Iā€™ve not done this type of maths before and want it to be clear what everything is.

This will create a frame that hovers over the GuiObject Icon.

    local Frame = Instance.new("Frame", _MainUI)
	Frame.Size = UDim2.new(0, 10, 0, 10)
	
	local CardSize = Card.Size
	local CardPxSize = Card.Front.MainFrame.AbsoluteSize
	
	local IconAbsolutePosition = CardIcon.AbsolutePosition
	local IconAbsoluteSize = CardIcon.AbsoluteSize
	
	local XPxToStud = CardPxSize.X / CardSize.X
	local YPxToStud = CardPxSize.Y / CardSize.Y
	
	RunService:BindToRenderStep(GunName .. "CardAppearenceFunction", Enum.RenderPriority.Last.Value, function()
		local MousePosition = Vector2.new(Mouse.X, Mouse.Y)
		local CardPosition = Card.Position
		
		local Vec3CardPosition = Vector3.new(CardPosition.X - (CardSize.X / 2), CardPosition.Y + (CardSize.Y / 2), CardPosition.Z) -- this is the top of the card in studs
		
		local IconPositionOffsetStuds = IconAbsolutePosition.X / XPxToStud

		local Vec3IconPosition = Vec3CardPosition + Vector3.new(IconPositionOffsetStuds, 0, 0)
		
		local IconVec3AbsolutePosition = Camera:WorldToScreenPoint(Vec3IconPosition)
		local IconUDimAbsolutePosition = UDim2.new(0, IconVec3AbsolutePosition.X, 0, IconVec3AbsolutePosition.Y)
		
		local IconTopRightCorner = Camera:WorldToScreenPoint(Vec3IconPosition + Vector3.new((IconAbsoluteSize.X / XPxToStud), 0, 0))
		
		local RealWidth = (IconTopRightCorner - IconVec3AbsolutePosition).X
		Frame.Position = IconUDimAbsolutePosition
	
		Frame.Size = UDim2.new(0, RealWidth, 0, (RealWidth * XPxToStud) / YPxToStud)
	end)

Iā€™d still like a more robust solution if anyone has one.

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#3

Donā€™t excuse yourself for writing readable code :wink:

Wouldnā€™t it be better just to have a 2D GUI and set its position to :WorldToScreenPoint(Adornee.Position)?

#4

Sorry to be picky, but you should get used to parenting the object, outside of the Instance function.

You can see the little ā€˜line throughā€™ on this wiki page.

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#5

Ya I do that for performance intensive tasks (say a new obj every frame), but Iā€™m often just lazy. Looks neater.

As for what Emerald wrote, hat would probably work, however Iā€™d need to set up 4 adornees, I think this solution is probably easier and tidier.

Thanks for your input!