Random datatype and consistency between client/server on different platforms

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#1

Given a random object with a seed that’s taken from the server, can that random object be expected to yield identical results to the server on any device or do I have to implement my own generator for this? I can’t find any guarantees for it on the API documentation.

Expected behaviour:

-- server
local seed = (tick() * 1e+5) // 1
ReplicatedStorage.GenerateLevel:FireAllClients(seed)
local rng = Random.new(seed)
for _ = 1, 5 do
    print(rng:NextInteger(1, 10)) --let's assume this prints 7, 2, 5, 1, 8
end

-- client
ReplicatedStorage.GenerateLevel.OnClientEvent:Connect(function(seed:number): ()
    local rng = Random.new(seed)
    for _ = 1, 5 do
        --this also needs to print 7, 2, 5, 1, 8 regardless of platform/device/whatever
        print(rng:NextInteger(1, 10))
    end
end)
#2

You would hope so right?
But…

It is tagged as fixed, and only under certain conditions.
If you notice problems it might warrant a bug report.

#3

this does make me a bit nervous, i might implement it in luau myself to avoid potential problems since i’m using it for procedural map generation

#4

You might want to consider math.noise, the docs seem pretty adamant the values will always be the same if the same seeds are passed.

I was building something similar recently, although haven’t quite got the chunks to blend properly yet

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