Question about % chance to get items

[Arcsol]

I have a doubt regarding percentage chance to get items. I was wondering if I have for example 3 items, each with a chance to be obtained, should have a certain "hierarchy" or order so it works properly. If you don't understand what I mean I'll post a trigger example:

• Chance to get items
  • Events
    • Unit - A unit Acquires an item
  • Conditions
  • Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Random percentage) Less than or equal to 10.00
      • Then - Actions
        • Hero - Create Item A and give it to Hero
      • Else - Actions
        • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
          • If - Conditions
            • (Random percentage) Less than or equal to 35.00
          • Then - Actions
            • Hero - Create Item B and give it to Hero
          • Else - Actions
            • Hero - Create Item C and give it to Hero

So that's how I do my % to get items: from the lowest to highest chance. Is this a good and reliable way? Does the order matter?

 

[MGCǂSpectre]

I think you should make the ranges more clearly

By choosing =< 35 that also covers from 0 to 35 while your first and second also cover that range. say from 0 to 10 they overlap as this range for both. It should be either =<10 for the first, =<35 and >10 for the second condition /less than 35 greater than 10/. This would create the 2 items if your % gets from 1 to 10 as it meets both conditions

 

[Ramza]

Why don't you use Item Tables (Advanced)?

I think you should make the ranges more clearly

By choosing =< 35 that also covers from 0 to 35 while your first and second also cover that range. say from 0 to 10 they overlap as this range for both. It's either from 1-10 from 11-35

No, no. Look at the ''If, Then, Else'' actions. The 35% is from the 90% that is left from the first ''If, Then, Else'' action.

Now you've got a 10% change to get item A, 31.5% chance to get item B, and 58.5% chance to get item C.

 

[Arcsol]

I never used item tables but as far as I know they're used to assign them when killing creeps right? That's not the use want, It's kind of a spell which has chance to create certain items.

Now you say my second item has 21.5% chance, why exactly? The whole percentage you said sums up to 60% but I want it to be 100% ... a little more clarification please?

 

[Ramza]

Well, the first item has a 10% chance to drop.

If - (Random percentage) Less than or equal to 10.00
Then - Give Item A
Else - Here you set a new ''If, Then Else''. So if the random number is between 11-100, it will pick this action.

Item B has a 35% chance to drop, of the 90% it's got left from the first ''If, Then, Else'' action. So, 0.90 * 35 = 31.5 (made a typo in my last post).

Item C: 100 - 10 - 31.5 = 58.5% chance to drop.

 

[Arcsol]

Now I understand better. So I'm pretty bad at maths, how do I make my exact percentages (Make it actually 35%)?

 

[Pharaoh_]

Switch the "Less than or Equal to" to "Equal to", but seriously, that's 1%; even in chances, you can't predict them, that's why they are called chances.

 

[Ramza]

This, for example:

• Actions
  • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    • If - Conditions
      • (Random integer number between 1 and 100) Less than or equal to 30
    • Then - Actions
      • Hero - Create Item A and give it to Hero
    • Else - Actions
      • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        • If - Conditions
          • (Random integer number between 1 and 100) Less than or equal to 50
        • Then - Actions
          • Hero - Create Item B and give it to Hero
        • Else - Actions
          • Hero - Create Item C and give it to Hero

Now both item B and C have a 35% chance to drop.

If you set the first integer condition to 33 instead of 30, all 3 items have 1/3 chance to drop.

 

[Arcsol]

I got lost again :S What difference does it make the 'Less than' removed? And 1% of what? I don't want to predict the chance, I want the item to be exactly 35% chance to be obtained.

Sorry for making such trouble u.u

EDIT:

I suppose the problem you mentioned comes with the (Random percentage) so your suggestion makes it 30, 50 and 20% chance respectively, right?

 

[Ramza]

I got lost again :S What difference does it make the 'Less than' removed? And 1% of what? I don't want to predict the chance, I want the item to be exactly 35% chance to be obtained.

Sorry for making such trouble u.u

EDIT:

I suppose the problem you mentioned comes with the (Random percentage) so your suggestion makes it 30, 50 and 20% chance respectively, right?

With that trigger, it's 30%, 35%, and 35%. You take the 50% of the 70% that's left from the first action. Do you see what I mean?

So, 50% of 70 is 35 for item B and C.

It's not 100 - 30 - 50. It's 100 - 30 - (0.5*70).

 

[Tr!KzZ]

Just don't put the itemdrop stuff in other if-then-else cases.. When you're putting your if-then-else into another if-then-else then the chances are influenced by the other if-then-else order.. so put them next to each other in a row, not within each other..

• action:
• Actions
  • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    • If - Conditions
      • (Random integer number between 1 and 100) Less than or equal to 30
      • Then - Actions
        • Hero - Create Item A and give it to Hero
      • Else - Actions
        • Do Nothing
  • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    • If - Conditions
      • (Random integer number between 1 and 100) Less than or equal to 50
    • Then - Actions
      • Hero - Create Item B and give it to Hero
      • Else - Actions
        • Do Nothing

This way all items have real % chances to drop. With real I mean from 100, so when you enter a number of 50 then u'll have a drop chance of 50%,
and not 31,5% or whatever, due to complex if-then-else orders.. For a smaller chance than 1% you have to use such boxed if-then-else orders..
like 1% from the first and 50% from the next, and you'll have 0,5% item drop chance.

Oh, but you have to use the above mentioned drop methods for items that should only be dropped when a certain other item should not get dropped.
Like: Item A get's dropped, so don't drop Item B or C, and the other way round.. while Item A was not dropped, Item B or C have a chance to get dropped.

 

[Arcsol]

I get it now. Thanks a lot, I'm good to go

EDIT:

Just don't put the itemdrop stuff in other if-then-else cases.. When you're putting your if-then-else into another if-then-else then the chances are influenced by the other if-then-else order.. so put them next to each other in a row, not within each other..

action:

• Actions
• If (All Conditions are True) then do (Then Actions) else do (Else Actions)
• If - Conditions
• (Random integer number between 1 and 100) Less than or equal to 30
• Then - Actions
• Hero - Create Item A and give it to Hero
• Else - Actions
• Do Nothing
• If (All Conditions are True) then do (Then Actions) else do (Else Actions)
• If - Conditions
• (Random integer number between 1 and 100) Less than or equal to 50
• Then - Actions
• Hero - Create Item B and give it to Hero
• Else - Actions
• Do Nothing

This way all items have real % chances to drop. With real I mean from 100, so when you enter a number of 50 then u'll have a drop chance of 50%,
and not 31,5% or whatever, due to complex if-then-else orders.. For a smaller chance than 1% you have to use such boxed if-then-else orders..
like 1% from the first and 50% from the next, and you'll have 0,5% item drop chance.

I'm not making an item-drop system. And that way, both chances may trigger at the same time (unless I add Skip Remaining Actions for each 'Then'), but Ramza already explained what I need already, thanks for the help though