Hi,
Im making a game and there are will be alot of NPC’s and i was thinking that there can be lags.
I think i need to create a script that will be showing to player only nearest to him nps’s.
So how i can check if player near to it? I will probably use local script for it 
local magnitude = (player.Character.HumanoidRootPart.Position - npc.HumanoidRootPart.Position).Magnitude
if magnitude <= 10 then --10 studs or less apart
--activate
end
Magnitude basically gets the distance between two things if you subtract their positions (in any order).
Here’s the DevHub documentation.
You can either use magnitude, or get touching parts. So you would make a spherical part welded tot he player and constantly check with :GetTouchingParts. The sphere is as big as you want to be to detect NPC’s:
note that the spheres cancollide is set to false, anchored is also false, transparency is 1
local NPCs = {All the NPCs HumanoidRootParts}
local Part = -- the sphere
Part.Touched:Connect(function() end)
while true do
local PartsTouched = Part:GetTouchingParts()
for i, Part in pairs(PartsTouched) do
if table.find(NPCs, Part) then
--do somthing
end
end
end
An alternative to this is to just use magnitude, like @TheCarbyneUniverse suggested.
To make it easier, try looking into CollectionService
local CS = game:GetService("CollectionService")
local NPCs = CS:GetTagged("NPC")
local Part = -- the sphere
Part.Touched:Connect(function() end)
while true do
local PartsTouched = Part:GetTouchingParts()
for i, Part in pairs(PartsTouched) do
if CS:HasTag(Part, "NPC") then
--do somthing
end
end
end
why should i use a spherical part? what the difference beetween just blocks and spheres?
