How to check if player isn't inside the region (GetPartBoundsInBox)

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#1
  1. What do you want to achieve?

I want to make that If player enters / leave the region, then the fog changes.

  1. What is the issue?

Entering region function is looking fine, but the leaving region function doesn’t run. And maybe another issue is finding player, but there’s no error of that.

  1. What solutions have you tried so far?

I’ve tried using table.find, if else, and checking if there’s no player inside the region.

local R1 = script.Parent.Parent.DarkRegionPart1
local R2 = script.Parent.Parent.DarkRegionPart2

while task.wait() do
	
	local region1 = workspace:GetPartBoundsInBox(R1.CFrame, R1.Size)
	
	for i, regions in pairs(region1) do
		
		local hitlist = {}
		
		if regions.Parent:FindFirstChild("Humanoid") then
			local player = game.Players:GetPlayerFromCharacter(regions.Parent)
			
			if regions ~= nil then
				table.insert(hitlist, regions.Parent)
				regionevent:FireClient(player, true) -- Activate fog
			elseif not table.find(hitlist, regions.Parent) then
				regionevent:FireClient(player, false) -- Deactivate fog
				print("not in region")
			end
			
		end
	end
	
	
end
#2

hi, i tested your code and the hitlist is being reset every iteration of the loop, which means it doesn’t maintain a record of which players were previously in the region

also the check for whether a player has left the region is not correctly implemented, as it’s done within the same loop that detects players entering the region. this won’t detect when a player has left because it doesn’t compare the current state to a previous state.

to fix these problems, you can maintain a list of players currently in the region and update it each iteration of the loop. Only then, you can compare the current list to the previous list to determine which players have entered or left the region

below i leave some example code (your script but fixed)

local regionEvent = script.Parent.Parent.RegionEvent 
local R1 = script.Parent.Parent.DarkRegionPart1
local R2 = script.Parent.Parent.DarkRegionPart2

local playersInRegion = {} 

while task.wait() do
    local region1 = workspace:GetPartBoundsInBox(R1.CFrame, R1.Size)
    local currentPlayersInRegion = {}

    for _, part in pairs(region1) do
        if part.Parent:FindFirstChild("Humanoid") then
            local player = game.Players:GetPlayerFromCharacter(part.Parent)
            if player then
                currentPlayersInRegion[player.UserId] = true
                if not playersInRegion[player.UserId] then
                    regionEvent:FireClient(player, true) -- Activate fog
                end
            end
        end
    end

    for userId, _ in pairs(playersInRegion) do
        if not currentPlayersInRegion[userId] then
            local player = game.Players:GetPlayerByUserId(userId)
            if player then
                regionEvent:FireClient(player, false) -- Deactivate fog
            end
        end
    end

    playersInRegion = currentPlayersInRegion
end
2 Likes
#3

This feels like a reasonable explanation. Thanks for the information.

#4

Also. I understand your script like half. Could you explain another for loops if you can?

#5

Hi, which part of the script do you need explained?
:smile:

#6

The userId on index thing. Could you explain for me all of them?

#7

For every player in the region, if it’s not the current player, then the fog will disappear.

#8

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