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No. You just don’t implement rarity. You only want to make it as if there is rarity but in reality you will only get common items, and then you make a button to get legendary with robux.

me when i use "pick random from 1 to 100" in scratch:

Actually, tbh, I agree with you. Rarity is harder than I think. Haven't had to program rarity before. The closest I got was programing a sort of 'fairness' system in randomizing maps. (1 in a row, and 2 in a row.)

1:26 yes, replicatedstorage

Bro you arrived in a great time, I just got to roblox lua scripting and these videos are teaching me better than my courses lol

rarity while seeming initially hard isnt that bad when you get around to understanding tables, so i decided id program a simple lua weighted randomizer and send it here for people to reference if they manage to see this comment first we wanna start off with a table, which is essentially a list. However, each list is only really allowed to have one entry within each line, so to make things more optimized we are effectively putting a small list containing the NAME of the item, as well as its rarity. the rarity in question acts more as a 'frequency' meaning the higher the number, the more abundant the object would become. the template is essentially {(brick color),(frequency)} afterwards we are going to run code that makes a new table (list), that inserts each entry of the original table (list) the number of times of its frequency. Meaning the white brick in the situation (view below) would be written down on the list 100 times. We do this for every entry and effectively have a long imaginary list with 230 entries (in the situation im showing off below.) The final part of this is picking a random number from 1 to the number of entries we have, and just taking the object from the spot in the list! ------------------------- local OurExampleList = { {"White Brick",100}; -- common {"Purple Brick",70}; -- Uncommon {"Green Brick",50}; -- rare {"Orange Brick",10}; -- legendary i guess } local ImaginaryList = {} --imaginary list that is used for later to decide which specific brick we want by inserting the (total of) 230 possibilities into for CurrentIndex, CurrentListEntry in OurExampleList do for count =1,CurrentListEntry[2] do --see the [2]? This is important here because we are sorting through the original example list, which has mini lists and we want the rarities from the mini lists. CurrentListEntry is also technically one of these, which can be found from the CurrentIndex (meaning the mini list {"White Brick",100} is found when CurrentIndex is at 1) table.insert(ImaginaryList,CurrentListEntry[1]) -- places the current entry into the imaginary list, this is run as many times as its frequency end end local Result = ImaginaryList[math.random(1,#ImaginaryList)] --This is another index similar to [2], but we are picking a random entry, from 1 (the first entry) to the TOTAL number of entries (which is essentially 230) print(Result) ------------------------- sorry for lack of formatting or if I was to vague on any topics, but this is just some simple sample code that is a nice stepping stone to understanding absolute essentials to development

short answer: chatgpt, long answer: this video edit: thanks though, i understood the video

the way i made a rarity system is more focused on convenience of updating, so instead of making a table or list of rarities i just made a folder containing numberValues and effects of each rarities, so it picks a random number between the lowest and whatever the sum of all values are (all of which are handled by a "ipairs" sequence), which was NOT easy.. but saved me a lot more time adding more and more stuff on it

I recently began my first game and just so happen to need this rn and u happen to upload this only 4 days ago wow how lucky am i to stumble upon this video thank u 🙏

When you’re using the counter variable while looping through the rarities, this is called prefix sums, and it’s pretty useful for cases like these. But I would say that it’s better to just construct the prefix sums table right after your rarities table is initialized so that you can have faster runtime (especially if there is a lot of rarities).

Thank you for this. And to all the viewers here, there's multiple variants of weighted RNG, I would highly recommend to try things out such as making an alternative to math.random(), or find another way to calculate the result. It's a complex system and there's no system that suits all, experiment with it. And with such, another method to this video is to add up all the weight values and multiplying it math.random() with nothing in the parentheses; from there, you go through each weight again and remove it from the accumulated weight that you got from multiplying till you reach 0 or less and return the item that triggered that check. However, by doing this method, you may see that high rarities will appear to be more common depending on the weight you assigned. Again, I highly recommend you to try things out and find new ways; step a little out of your comfort zone, but not by too much, learn from the behaviors and mistakes you come across.

Very educational,deserves a sub 🎉

been considering for the course

I had a system for my now abandoned game. The rarity system was so advanced. It had to take like 8 values in mind when generating. It was basically an armour generator. Where each piece had multiple stats. But certain stats where handled differently. Before i started it, i thought it was gonna be super easy. shit was harder than anything ive done. It also had to work with data saving. I had like 5d array for each stat. Crazy. It used like 5 scripts in total. the rarity script was like 300+ lines. And when i code, i code to make it as efficient as possible. Then i realised, its roblox. It doesnt need to be this complicated. So now i stick to simpler games.

funnily enough, i made a rarity system using this concept in obby creator like 3 years ago without even realizing this is how rarity systems work in roblox coding

I tried to make a rarity in a different project in a different language, and I gave up, decided to use a simple formula to decide the chance of each rarity. It's not perfect but it gets the job done.

me when math.random

i would just give one part a variable that would be random every time the part is created, if the variable is 1 then it would look legendary (change its skin to legendary) and so on. it actually would make you a less messy workspace and you don't need to use a loop

New to Programming in general, figured id give it a shot for fun. ive got my entire two scripts coded exactly like shown in the video yet it wont spawn any bricks of ANY rarity. Anybody know why? im assuming im missing something very obvious lol, ive paid heavy attention to case sensitivity and efficient naming

I programmed rarity in a card game i made, i sorted differente rarities (common, rare, super rare) gave them values, then sorted a random integer between 1-100, depending on witch number it gave some rarity was sorted, then inside that rarity was an array of cards, it randomly choose one of them, that way i could have multiple rarities and many cards inside each rarity, worked perfectly

You can use your rarity "weight" as the maximum range for math.random and then a successful pull is when your random number is equal to 1. This makes it so you don't have to hand modify your weights every time you decide to add something rarer because adding something rarer just means the new entry will have a bigger weight number.

i never thought of this being difficult damn, whenever I've had to program it I've just kind of done it without thinking bc its not that hard

The only reason why i would make a rarity system is to make a rotation shop with cosmetic items. As pet sim, blade ball and sols rng is basically gambling glorified Edit: Well because it looks like some of sols rng players are going after me in the comment, i want to clarify that i dont think that sols rng is gambling, and that pet sim and blade ball is the roblox casino. But what makes me group the game up with the others are that sols rng enforces the gambling mentality that the next one could be the super good reward. This could create a habbit in children which could lead to them resorting to gambling later in life. This is also not something that i feel like sols rng is doing, but basically all popular roblox games nowadays.

I always thought there were basic frameworks that most roblox game devs use to implement somewhat usable rarity systems, depending on the amount of effort the devs put into the game would directly correspond to how well and unique the rarity system would be (If they change the framework that is).

1:26 "ReplicatedStorage"

As a RNG game developer, I can explain how games add new items with new rarities not adding up to 100% while still being accurate. A first idea I had was to make, for example, common (50%) be added 50x in a table, and all that for each of the rarities, then returning a random one, except that's way too slow for huge numbers like 1,000,000, Roblox risks to crash. But then the ultimate solution is quite quite hard to understand : developers just use a rarity table like in this video, except their random generator function computes each "part"'s rarity weight and return a random part on its weight compared to other ones. Yep, that's quite hard to understand and redo but that's how it works. I spent hours documenting that subject and I made a pretty accurate rng system.

what if in the chooseRandomPart you just do if randomNum == 1 do..., elseif 2 =< randomNum =< 19 do ... elseif 20 =< randomNum =< 29 do... etc wouldn't it work too ? i never coded on roblox studio

Yo just an idea but could you use multiple random number generators to find rarity so you don’t need to make it up to 100 percent? For example:find random int from 1 in 100. If you don’t get 1, roll 1 in 50. If that fails roll 1 in 10. If they get 1 on any of these rarities then they get the pet associated with that rarity. Then you can have things like 1 in 1 billion without having to worry about any of the math, and if they fail all rolls you can just give them the lowest rarity. This also makes it a lot easier to add 2x luck mechanics etc, even if it’s a bit slow computational wise with too many rarities

So would that mean that to have an increased chance, you'd just divide by the new luck? For example, before running the table, if you say, had a x2 luck modifier, you'd divide the random number by 2?

Idk in roblox studio, but in unity i would just make the machine chose a random int between 1 and a 100, and if its 1 &&

if table order is not waranteed then dont return a value at that point. Instead, store the value and keep iterating

Meanwhile python

I can confirm that, it was brutal and at the end I must use tutorial!

i saw the text "programming rarity is harder than you think" no its not i made a system right after i saw it to show and it was easy . for all devs that struggle : if you struggle with a rarity system , dont give up (BTW : If something is 1% of 100 % in 1000 drops i got ONLY 9 of them)

Oh my glorious king ByteBlox are you going to do the thug shaker i have been waiting for so long

ill be honest, i never considered this hard as i knew for a long time how weight/cost works for randomization

instead store a value of numbers that it has to be greater than and generate a random number from 1-100 store it as randomValue or something then loop through from legendary to common (must be in that order to ensure your probobabilties are acurate) checking if the value of each is greater less than randomValue so you would start to check if it was 100 (only number it could generate greater than 99) and go on untill 0

why not something along the lines of "for [generic item here] : generate number 1 through X, and if that number is 1, give [generic item here]"?

its easier to make common 100 - all of the other raritys. if you do that its seamless when implementing new raritys into the game

sol's rng dev gonna call himself a developer after he realizes people will think coding rng is hard

wouldn't it be easier to do something like a random number event happen via player and then make a series of if elseif statements? like are there any downsides to doing it like so? Sorry if its a dumb question, just curious :))

i still see myself as a new dev and i expected to be flabbergasped by the complexity of this script for it to just be extremely easy

You could make a rarity system like he did and make it work by just making it check the first number in the table and if a number is less than the Random number it will get the table index of the rarity and add one to that and check the rarity of the one above the current rarity if that one is equal to or less thAn aswell, if it is less than then it will go to that rarity and check the same until it ends on 1 rarity. If the rarity is not less than the number it will check the next rarity. Bassically just if one number is wrong then go up if one number is right then check the next one if it’s also right and if the next one is wrong it will select the current number. If the number above is right, it will go to that one and check agian.

As a game developer there's several ways around this. Well I use unreal engine so it might be different for Roblox.

1:25 I've never programmed anything on "Roblox" before, but here's probably what I'd do in this situation, create a bunch of pets, none of them are intentionally favored, they are all on equal footing, you'll store on the server a quantity of each of these pets, every day increase the number of every pet by a fixed amount, such as 100 though it depends on how many people are playing your game, each time someone buys it decrease the number of pets, the cost of each pet depends on the number of those pets left compared to the other pets, with it being impossible to buy a pet that is out of stock entirely. Any pet that has far fewer left than all the other pets will get categorized as rare or legendary until it no longer has less than the other pets, you can add sparkles or something to these special pets, you can probably also make it possible to sell pets back if you want to make things more interesting, though it may be best to have a time limit on how long you can have the pet before losing the ability to sell it.

i actually use set {_num} to random integer between 1 and 1000 if {_num} is between 1 and 100: do something its about 10% cause 1/1000 is 0.001 which is 0.1% 10 is 1% 100 is 10% and 1000 is 100% so yeah

theres a better way to do it to have it guarantee a certain rarity based on luck and it can support numbers up to 1e308. I have my own pseudo number generator that doesnt use roblox’s random library though. Personally this method is better than weights

I had to make an item that gives you one of 7 items with equal odds, plus one that has a 2% chance of spawning I did it by putting all of them except the rare item in a table, then I made a random number generator that picks a number from 1 to 100, if the result is above 98 then it picks the rare item, else it picks one of the random common items

5:53 - What happens if they do not sum up to 100?

hey byte, I was thinking to buy your course but idk what I can learn and what I can do with your course, I'll be able like, to make a... simple game of combat, or maybe an advanced?

if i heard you right then this rarity technique is not precise and could be unfair (not sure tho) is there a way to perfectly sort the rarities so its always very precise the same and fair?

what about just taking a random number, between 1-100, then if it is greater or equal to 100, it is legendary, elif it is greater or equal to 85 it is epic and so on?

well guided ❤

on box open generate number 1-10 case 1-5 common pick from common list case 6-8 rare pick from rare list case 9-10 legendary pick random from legendary list thank you very cool

Please make a tutorial on how to level up your Scriptingan I have been stuck on third tomoe for a year now

Can you do it by picking a number 1 to 100 and then like if number is 1 then return legendary and if the number is 2-20 it will return epic and so on?

well what can i say? i was just thinking on how i could make a rarity system for my crate opening system. thanks

You just did a 100k players game congrats

pls make an RNG game where the better rarity you have, the better you are than everyone, for example if you have a better rarity you might be faster or get weapons or maybe even admin powers

scripting a rarity system is easy tbh, the real difficulty is scripting a LUCK system inside the rarity one

Is this actually 1% chance on legendary? I think it's even less? The way you retrieve the object makes me a little confused on the actual percentage. Also this method brings me a lot of memories about greedy programming problems, like the backpack greedy problem.

What software are you using to code this in?

Ah he used chatgpt for this

Screw it, low tier items are ultra rare like a bee in alaska and high tier items are like rocks in a quarry.

I am pretty sure that sols rng devs don't try to loop through 1 billion

But how do you make luck potions? What even does luck

I'm no expert but in python id use randint to generate and intiger from 1-100 then put those values to be a random item (For example, if the intiger is 1-80 its commonn, if I get 81-90, its rare, etc.)

all you need is knowing basic statistics and use random numbers

I did this same code in 6 minutes using only 40 lines without watching the tutorial using only one script, and made it also go between multiple items in each rarity. Programming rarity is easier than you think.

Why don't you just check for the rarity weight alone?? for rarity,weight in module.rarities do if randomNum

The system I would use would be something like: Local rarities = { Common = {prob = 1/2} Uncommon = {prob = 1/4} Rare = {prob = 1/8} } Local function getranditem(table) number = math.random() for i in pairs(table) do cumalprob = cumalprob + i.prob if number

Just get a random generated number from 1 to 100 pick 1 number and done u got a 1% rarity

that feels kinda icky even tho you got a 1 on the random number you only have a 1/4 chance of actually getting the legendary

orrr ‘hey chat gpt. make me a rarity system.’ or even better ‘teach me how to make a rarity system’

Don’t know anything about scripting but this video was entertaining

i hate it when my pets have spikes and machine guns attached to them, it happens every time

or you can do this if math.Random(1, your chance) == 1 then --what to do end

I thought it was going to be simple and it was somehow even simpler than I anticipated... this is like, babies first coding class

Once I made a Priority System to spawn ores. It worked pretty well.

Wait what? Adding rarities is hard? Man… I guess it is hard then… felt simple for me, but idk, maybe because I read a rarity thing a few years ago, and it’s just engrained in my mind now.

Now I get why you think coding this is hard, and I agree.

i feel so intelligent after i correctly predicted what you did

This is overly complicating such a trivial matter for no reason

Being this early is criminial.. also ur vids r really good.. keep up the good work!!

It could be easily fixed using table.sort and and an ipairs loop tho

you are an inspiration byteblox

Couldn’t you just put a value in each part and get a table and the bigger the number the amount of copies will be added to the table? (And then obviously choose a random part from the table)

1:21 ah yes ,common,undead ,twilight and archangel

I missed the part where this was supposed to be difficult

I have coded a rarity system after 1 year of programming lol on my own

What does AAA game mean? Does it mean that when someone gets good stuff they say “AAAAAAAAAAAA!!!!!!!”?

you don't need to make your rarity weights total up to 100, but instead just do math.random(1, [sum of all your weights]) for your random number instead of 1 - 100.

4 mins this time lol still good luck tho i dont even have notifications on i just hoped on my home page lol

pls be my Math teacher 🙏 ur explanation is so goodd

not gonna lie I thought when you said it is muuuuuch harder I thought that it was but it's exactly how python works

Me at 8th grade " so basicallly you can give me kitusne fruit right :D"

Video title: programming rairity is harder than you think Video: *T A B L E S .*

Can you do admin commands

Maybe use: local rarity = 0.01 -- put how rare you want it to be if math.random() < rarity then -- do something end