RPG Drop Rate, random math function?
If I were to per-say kill a mob, and I had a 20% chance of getting a uncommon item, how would I go about scripting that? I was thinking creating a random number from 1-5 and if it landed on 3 you would get the item. Is there a better more efficient and detailed way to do this? There are no videos on free models or guides or anything about random drop rates so I'm a little stuck and that's the only thing I can think of
2 answers
Weighted selections
So, you want to make loot tables? Too bad, I'm telling you anyway. Loot tables are simple enough - Consider a table where every key is the unique loot, and every value is the probability of it being dropped (relative to the others)
1 | Loot = { |
2 | Loot1 = 1; |
3 | Loot2 = 3; |
4 | Loot3 = 10; |
5 | ReallyFarTooCommonLoot = 1000; |
6 | } |
Then, we can generate that table into an array of values:
1 | newLoot = {} |
2 | for k,v in next, Loot do |
3 | for i=1, v do |
4 | newLoot[#newLoot+1] = k |
5 | end |
6 | end |
7 | Loot = newLoot; |
And then we can randomly select an entry from that loot table array.
1 | Drop = Loot[math.random(#Loot)] |
And now you have your chosen drop, with a weighted chance of selection.
0
This is just an idea on how you could go about doing this
So you could use a random number and have a table and based on the random number, one of the items in the table is chosen.
1 | local items = {"common","common","common","common","uncommon","common","common", |
2 | "common","common","uncommon","rare"} |
Then say whatever happens, and they are going to get the item
1 | local items = {"common","common","common","common","uncommon","common","common", |
2 | "common","common","uncommon","rare"} |
3 | local chosen = items[math.random(1,#items)] -- gets a random one from the list |
4 | print(chosen) |
Then just if the item is common then whatever, elseif it is uncommon then whatever, elseif it is rare then whatever.
01 | local items = {"common","common","common","common","uncommon","common","common", |
02 | "common","common","uncommon","rare"} |
03 | local chosen = items[math.random(1,#items)] -- gets a random one from the list |
04 | print(chosen) |
05 | if chosen == "common" then |
06 | --Do whatever you want |
07 | elseif chosen == "uncommon" then |
08 | --Do whatever |
09 | elseif chosen == "rare" then |
10 | --Do whatever |
11 | end |
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