How can I detect which object is closer to the middle of the screen?

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#1

I am trying to make it so that only the object that is closest to the middle of the screen is detected, but whenever I do it, all 3 or 2 are activated

my code here:

while wait() do
	if Enabled.Value == true then
		for _, blocks in pairs(workspace.partstest:GetChildren()) do
			if blocks.Name ~= ACTUALPLAYER.Value and blocks:IsA("Part") then

				local part = blocks
				
				local worldPoint = blocks.Position

				local vector = camera:WorldToScreenPoint(worldPoint)

				local delta = Vector2.new(vector.X, vector.Y)-camera.ViewportSize/2
				
				local datos = worldPoint

				local inCamX = delta.Magnitude<camera.ViewportSize.X/5
				if inCamX and vector then
					blocks.Material = Enum.Material.Neon
					blocks.BrickColor = BrickColor.new(0, 255, 0)
				else
					if not inCamX or not vector then
						blocks.Material = Enum.Material.Plastic
						blocks.BrickColor = BrickColor.new(255, 255, 255)
					end
				end
			end
		end
	end
end

How can I make it only detect the one closest to the middle of the screen?

#2

You can have a table that stores sub-tables which include the object and the distance of the object onscreen to the center of the screen, then sort the table from the closest to the farthest:

local parts = {}

while true do
    if not Enabled.Value then return end

    for _, block in ipairs(workspace.partstest:GetChildren()) do
        if block.Name == ACTUALPLAYER.VALUE or not block:IsA("Part") then continue end
        local pos = camera:WorldToViewportPoint(block.Position)
        local center = camera.ViewportSize / 2

        table.insert(parts, {
            Block = block;
            Distance = (center - Vector2.new(pos.x, pos.y)).Magnitude
        })
    end

    table.sort(parts, function(a, b)
        return a.Distance < b.Distance
    end)

    local closest_part = parts[1].Block
end
#3

i got the problem invalid argument #2 (Vector2 expected, got Vector3)

table.insert(parts, {
Block = block;
Distance = (center - pos).Magnitude <—here
})

#4

Edited original post for the fix - forgot WorldToViewportPoint returns a vector3 so it had to be converted into a vector2

#5

You can omit the 3rd (Z-axis) component of this returned Vector3 value as it just represents the depth from the screen to the world point, the X and Y axis components are more important here.

#6

I know that and I have done that. It would be good if they decided to implicitly cast a Vector3 to a Vector2

#7

Not a bad idea, as in if attempting to cast a Vector3 to a Vector2 constructor the 3rd (z-axis) component is omitted automatically.