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-- Popper.lua
-- Prevents your camera from clipping through walls.
--------------------------------------------------------------------------------


local Players = game:GetService("Players")

local CollectionService = game:GetService("CollectionService")

local camera = game.Workspace.CurrentCamera

local min = math.min
local tan = math.tan
local rad = math.rad
local inf = math.huge
local ray = Ray.new

local function getTotalTransparency(part)
	return 1 - (1 - part.Transparency)*(1 - part.LocalTransparencyModifier)
end

local function eraseFromEnd(t, toSize)
	for i = #t, toSize + 1, -1 do
		t[i] = nil
	end
end

local nearPlaneZ, projX, projY do
	local function updateProjection()
		local fov = rad(camera.FieldOfView)
		local view = camera.ViewportSize
		local ar = view.X/view.Y

		projY = 2*tan(fov/2)
		projX = ar*projY
	end

	camera:GetPropertyChangedSignal("FieldOfView"):Connect(updateProjection)
	camera:GetPropertyChangedSignal("ViewportSize"):Connect(updateProjection)

	updateProjection()

	nearPlaneZ = camera.NearPlaneZ
	camera:GetPropertyChangedSignal("NearPlaneZ"):Connect(function()
		nearPlaneZ = camera.NearPlaneZ
	end)
end

local blacklist = {} do
	local charMap = {}

	local function refreshIgnoreList()
		local n = 1
		blacklist = {}
		for _, character in pairs(charMap) do
			blacklist[n] = character
			n = n + 1
		end
	end

	local function playerAdded(player)
		local function characterAdded(character)
			charMap[player] = character
			refreshIgnoreList()
		end
		local function characterRemoving()
			charMap[player] = nil
			refreshIgnoreList()
		end

		player.CharacterAdded:Connect(characterAdded)
		player.CharacterRemoving:Connect(characterRemoving)
		if player.Character then
			characterAdded(player.Character)
		end
	end

	local function playerRemoving(player)
		charMap[player] = nil
		refreshIgnoreList()
	end

	Players.PlayerAdded:Connect(playerAdded)
	Players.PlayerRemoving:Connect(playerRemoving)

	for _, player in ipairs(Players:GetPlayers()) do
		playerAdded(player)
	end
	refreshIgnoreList()
end

CollectionService:GetInstanceAddedSignal("IgnoreCamera"):Connect(function(obj)
	table.insert(blacklist, obj)
end)
