How to get a 3D position from a 2D map?

[JOSIMA33 (JOSIMA)]

I’m trying to generate a position in the workspace by clicking on a map frame.
I use Player:GetMouse().X and Player:GetMouse().Y to get the mouse position.
This function converts a 3D position in the workspace to a 2D position on the frame:

local function Position3dTo2d(position, center)
	local x, y, z = position.X - center.X, position.Y, position.Z - center.Z
	local X, Y = Frame.AbsoluteSize.X * x / ZoomDistance + Frame.AbsoluteSize.X/2, GUI.AbsoluteSize.Y * z / ZoomDistance + Frame.AbsoluteSize.Y/2
	
	return Vector2.new(X, Y)
end

This function converts a 2D position to a 3D position:

local function Position2dto3d(x, y)
	local X = (x - Frame.AbsoluteSize.X/2) * ZoomDistance / Frame.AbsoluteSize.X
	local Z = (y - Frame.AbsoluteSize.Y/2) * ZoomDistance / Frame.AbsoluteSize.Y
	
	return Vector3.new(X + Center.X, 0, Z + Center.Z)
end

The position generated is only correct on the X-axis, not the Z-axis. I believe that this is related to the screen’s resolution. The offset on the Z-axis changes as the screen size changes. How can I fix this?

Any help is greatly appreciated!

[Dogekidd2012]

Is Camera:WorldToScreenPoint what you want instead?

[Dogekidd2012]

Oops, I got it the other way around. You might want Camera:ScreenPointToRay (or ViewportPointToRay if you find the GUI offset hurts you).

[bonkybincer]

Have you tried using UIAspectRatioConstraint?

I’m not entirely sure if the map you’re describing is a static-sized interactable frame, but the frame’s absolute size is different for every resolution… (assuming you’re using scale, and not offset)

Also, try this…
Again, I don’t know if the map’s size is static, but try using Frame.Size.Scale (or offset if applicable) instead of AbsoluteSize.

[tlr22 (FusionOak)]

If you believe it to be the inset you can try using this to correct for it

Create on Roblox

game:GetService("GuiService"):GetGuiInset()

Or you could try setting this:

Create on Roblox

[JOSIMA33 (JOSIMA)]

Thank you! That did the trick

Heres the modified function:

local function Position2dto3d(x, y)
	local inset = GuiService:GetGuiInset().Y
	
	local X = (x - Frame.AbsoluteSize.X/2) * ZoomDistance / Frame.AbsoluteSize.X
	local Z = (y - Frame.AbsoluteSize.Y/2 + inset) * ZoomDistance / Frame.AbsoluteSize.Y + inset
	
	return Vector3.new(X + Center.X, 0, Z + Center.Z)
end