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
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RPG Drop Rate, random math function?
2 answers
✓ Accepted answer
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)
Loot = {
Loot1 = 1;
Loot2 = 3;
Loot3 = 10;
ReallyFarTooCommonLoot = 1000;
}
Then, we can generate that table into an array of values:
newLoot = {}
for k,v in next, Loot do
for i=1, v do
newLoot[#newLoot+1] = k
end
end
Loot = newLoot;
And then we can randomly select an entry from that loot table array.
Drop = Loot[math.random(#Loot)]
And now you have your chosen drop, with a weighted chance of selection.
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.
local items = {"common","common","common","common","uncommon","common","common",
"common","common","uncommon","rare"}
Then say whatever happens, and they are going to get the item
local items = {"common","common","common","common","uncommon","common","common",
"common","common","uncommon","rare"}
local chosen = items[math.random(1,#items)] -- gets a random one from the list
print(chosen)
Then just if the item is common then whatever, elseif it is uncommon then whatever, elseif it is rare then whatever.
local items = {"common","common","common","common","uncommon","common","common",
"common","common","uncommon","rare"}
local chosen = items[math.random(1,#items)] -- gets a random one from the list
print(chosen)
if chosen == "common" then
--Do whatever you want
elseif chosen == "uncommon" then
--Do whatever
elseif chosen == "rare" then
--Do whatever
end
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I've come back to this answer 2 years later to provide a caveat: Whilst this answer is incredibly simple, it's actually terribly poorly memory optimised. That said, it should be sufficient for most people nonetheless.