Damage Formulas 101

Skunk · 2017-07-28T16:33:52+0900

Please note: A discussion has already been started about different things you can do with these formulas so please direct those comments and question to the appropriate thread. https://forums.rpgmakerweb.com/index.php?threads/rmmv-damage-formula-ideas-and-help.47099/ A link to the list of script equivalents of event commands https://forums.rpgmakerweb.com/index.php?threads/rpg-maker-mv-script-call-list.46456/ Damage Formulas 101 MV Edition You probably wondered how to make a skill do more damage against enemies with a state, or heal more if player has a state, or deal exactly half of enemy's HP. And so on. All of that and more can be done through custom damage formula. Basics: Type - sets what does the formula damage or heal. None - Nothing, no damage will be dealt. HP Damage - HP will be damaged MP Damage - MP will be damaged HP Recover - HP will be restored MP Recover - MP will be restored HP Drain - Deals damage to enemy HP and restores that much HP for attacker MP Drain - Deals damage to enemy MP and restores that much MP for attacker Element - Sets which element to use. Normal attack - means will use same element as weapon. Variance - How will damage fluctuate. E.g. If skill formula says it deals 100 damage and variance is 20%, the skill will deal between 80 and 120 damage. Critical - Can skill critically hit, dealing increased damage by 300%. And now, the actual fun part - formulas! It decides how much damage will opponent take or ally will heal. Let's dissect one of basic formulas that come with RPG Maker MV - Fire 100 + a.mat * 2 - b.mdf * 2 What do things like a and b mean? a - attacker b - defender So if Actor Glasses were to cast Fire on a Slime. a would be Glasses and b would be Slime. Meaning the takes double of Glasses mat (Magic Attack) parameter and subtracts double of Slime's mdf (Magic Defense) parameter and adds that to the 100 in the beginning ofthe formula. E.g. Glasses has 100 mat and Slime has 20 mdf. If we were to convert fomula using those numbers, we'd have - 100 + 100*2 - 20*2, after calculation we see with those parameters Fire would deal 260 damage if there were no variance. But only last number in the formula deals damage. If you had 2 lines of formula. (semicolon ; tells where line ends for the program) E.g. a.atk; a.atk*2 Only a.atk*2 would be calculated for damage. Are there more letters other than a and b for the formulas? Yes. There are variables. Which are used like this: v[ID]. ID - index of the variable. So you could have a skill that gets stronger the higher variable is. E.g. v[10] * 2 - b.def * 3 Is there a way to make skill even more complex, e.g. if some variable is over 100, deal extra damage? Yes, in that case we can use if else statements. How if else statement looks: Code: Code (Text): if (statement) { formula1; } else { formula2; } But how to write it to the damage formula? It only has 1 line! Just write everything together~ Code (Text): if (statement) { formula1; } else { formula2; } E.g.: Code (Text): if (v[10] > 100) { a.atk*4 - b.def*2 } else { a.atk*2 - b.def*2 } Which can be shortened to this if you're using only 1 line of formula. Code (Text): if (statement) formula1; else formula2; E.g.: Code (Text): if (v[10] > 100) a.atk*4 - b.def*2; else a.atk*2 - b.def*2; And you can shorten it even further using ternary operator (my favorite one): statement ? formula1 : formula2; E.g.: Code (Text): v[10] > 100 ? a.atk*4 - b.def*2 : a.atk*2 - b.def*2; Symbols for statements: > - more than = more than or equal to 100 ? 1000 : 100; (If variable 10 is more than 100, it'll deal 1000 damage, else it'll only deal 100) v[10] == 100 ? 1000 : 100; (If variable is 100 or more, it'll deal 1000 damage, else it'll only deal 100) v[10] 50 && v[11] >== 25 ? 1000 : 100; (If variable 10 is more than 50 and variable 11 is 25 or more, it'll deal 1000 damage, else it'll only deal 100) v[10] > 50 || v[11] > 50 ? 1000 : 100; (If variable 10 is more than 50 or variable 11 is more than 50 then it'll deal 1000 damage, it'll only deal 100) v[10] !== 100 ? 1000 : 100; (If variable 10 is not equal to 100, it'll deal 1000 damage else it'll only deal 100) What about parameters to use for a and b? Here's a whole list of them: Current: (All flat numbers, e.g.: 900, 999, 11) level - current level (Actor only by default) hp - current hp mp - current mp tp - current tp Params: (All flat numbers, e.g.: 1337, 7331, 156) mhp - max hp mmp - max MP atk - attack def - defence mat - magic attack mdf - magic defence agi - agility luk - luck XParams: (All decimal numbers symbolizing pe…

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Started by Skunk Jul 28, 2017, 07:33 AM 281 posts Page 7 of 15 View original ↗

Overkill24

#121 Feb 17, 2021, 04:20 PM Source

bgillisp said:
Cut it out everyone. I don't care who started it, I'm ending this. Return to debates on damage formulas please.
Just saw the post. Will do.
ScorchedGround

#122 Feb 17, 2021, 04:22 PM Source

Zacyiia said:
I am starting to think those plugins you claimed to have made are not your work.

Zacyiia said:
So not only are you a liar and a slanderer, but possibly a thief as well? How Awful.

These are some GRAVE accusations.

And I just want to let you know that looking at this conversation from the outside, you are actually looking like a complete jerk right now.

Disregarding any information given and just saying "Yanfly said so, read it again for the sixth time please", does not look like someone who is willing to accept he may be in the wrong after all. But you accused TheoAllen of this.

Instead of disspelling the statements @TheoAllen gave you (Like you wanted him to do with Yanflys article), you just attacked his person to wash over the fact that he is trying to explain that this only affects Auto-Battle.

I can only say that I have read yanflys article some time ago and was scared sh*tless because I use a lot of mechanics in my damage formula. So I immediately did some extensive testing.

And so far nothing ever broke because of it. So it really seems that it only effects the Auto-Battle trait on actors. Like TheoAllen wanted to explain.

Also, going back to the weight-based decision making for enemies, I don't really know the code behind it, but experience tells me that it REALLY is the only determining factor for enemy decision-making.

This obviously includes additional factors apart from weight (like MP costs, use conditions etc.), but the AI could not care less which skill produces the highest number, they don't even care about elemental resistances or state immunities and such.

And lastly, you could have done some research of your own and then you would know that TheoAllen is a very credible member of the community and dragging his reputation through the mud because you are a sore loser is not good. And as he already suggested, you could always search for other sources to confirm any type of information.

Obviously, you should not take any word he says for granted, but neither should you do that for Yanfly or anyone else for that matter, so your suspicions are justified, you just neglect to actually confirm anything for yourself.

Okay now I'll excuse myself, have a great day everyone. Let's just leave it at that.

Edit: Reading through this reply again, I noticed that I sounded pretty rude towards you @Zacyiia and I apologize for that. I did not have any "ill intent" or desire to attack you. But reading through your conversation with TheoAllen I could not sit still.

Now, I do not know TheoAllen personally (obviously) and as such, the following statement is made purely off of observation;
I believe that the reason you perceived TheoAllen as "rude" and "having a superiority complex" is because he is by nature (or atleast on this forum) very blunt and honest. He does not actively try to not hurt anyones feelings. And as such he does not hold back any knowledge or opinion he has.
I personally like that but as we could see it can lead to some unfortunate circumstances.
Cyberhawk

#123 Feb 17, 2021, 04:47 PM Source

Couldn't have said it any better.
I never did try putting mechanics in the dmg formula myself.
Probably will have some inquires when I get back to my MV project at some point. So it's good to know this thread is here.
Skunk

#124 Feb 17, 2021, 07:19 PM Source

Woah... would be nice if people could focus on the topic instead of using this thread as a place to flex your egos.
Madam_Detective

#125 Feb 17, 2021, 08:14 PM Source

Let me chime in a bit...

I believe that the reason you perceived TheoAllen as "rude" and "having a superiority complex" is because he is by nature (or atleast on this forum) very blunt and honest. He does not actively try to not hurt anyones feelings. And as such he does not hold back any knowledge or opinion he has.
I personally like that but as we could see it can lead to some unfortunate circumstances.

Spoiler
I don't know him very well, either. But while I haven't been getting any "rude" replies from him, I can say that I've seen some, let's say, very questionable posts from him. Some of them seemed to have a hostile tone in them. It was as if he was trying to exert his intelligent and superiority over someone else to stroke his ego. I've seen the same attitude from high schoolers and other not-so-nice places on the internet, so it bugged me when I saw that from him. Not that I want to throw shades at anyone, to be clear. And the other guy could have handled the situation better as well.

"It's not what you say, but how you say it."

I don't know if the rudeness was done on purpose or if there were some communication issues. I believe a sign of a mature person is being able to express yourself and convey your opinions without figuratively taking the piss out on everyone else. That goes for ~~both of you~~ all of us. Worst case scenario, just block each other and move on. I'm not good at communicating, either, and someone told me I was often being passive-aggressive. We talked and sorted out our misunderstanding. So don't anyone take what I said personally.
If Theo still wanna argue, 1v1 Yanfly somewhere else and let everyone see.

On the subject at hand: our games are not the same and we all have different ways of doing things. Just because one way works for you doesn't mean it must work for everyone else and vice versa. The players won't know any of these behind-the-scenes methods. What they care about is if the game is playable. Do whatever suits you, as long as you can release a functional game. You wanna put mechanics in the damage formula? I don't care if you do. I wouldn't know. No one would know. If your game works, cool. If it has issues, well, you know better than to leave that crap in there.
Skunk

#126 Feb 17, 2021, 09:33 PM Source

Ok, that should be quite enough.
If you guys want to discuss the intricacies of who is right and wrong, or who is smarter than who.. Take it to your inbox.
This thread was designed for people to learn, and the forum is designed for people to read and learn... not wade through a BD contest between developers.
Admin already asked you guys to stop, and the admin was ignored.
Which speaks volumes of the issue at hand.
Shaz

#127 Feb 17, 2021, 10:53 PM Source

[mod]For the second time, let's drop it. Back to the topic please.[/mod]
epson777341

#128 Feb 18, 2021, 03:59 AM Source
Iqus said:
You can do

Code:
let sum = 0; for (i = 10; i < 78; i++){ if (user.isStateAffected(i)) sum += 1; }
To only check for those states you have lined up.
That works! Thanks so much, huge load off my mind.
Iqus

#129 Feb 18, 2021, 09:07 AM Source

epson777341 said:
That works! Thanks so much, huge load off my mind.
Another option, and one which can be used with non-consecutive states, is just making an array containing all IDs. I would recommend doing this instead.
Solar_Flare

#130 Feb 27, 2021, 11:13 PM Source
For an example of how to do that:
JavaScript:
[3, 5, 12].reduce((_, state) => _ || a.isAffected(state), false)
Or more verbose and maybe easier to understand:
JavaScript:
let sum = 0; for(i of [3, 5, 12]){ if(user.isStateAffected(i)) sum += 1; }
SoaringDreams

#131 Mar 12, 2021, 06:15 PM Source

Hi again,

I'm working on a skill that ideally function off conditions with states.

EX:
Player: has to cast Fire, gains state (1)
Player: has sword Skill 1, on hit does regular base damage of 30, but if user has state(1), it will add state(2) to user.
Player: sword Skill 1 continued. When user has state(2) will deal base damage of 80.

so
a.isStateAffected(164) ? a.atk + 80 - b.def : a.atk + 30 - b.def; a.isStateAffected(159) ? a.addState(164) : a.atk + 30 - b.def; a.atk + 30 - b.def

so Im trying to get this entire line of code in one formula to function correctly.
Cryogenic

#132 Apr 2, 2021, 03:43 AM Source

Hi Folks,

Trying to set up a skill (spell-like attack) that deals hp damage then has a chance to repeat the attack. Not really sure where to start.
GradiustheFox

#133 Apr 3, 2021, 01:15 AM Source

I'm trying to create something way more ambitious than my brain is capable of, and doing so in likely the clumsiest way possible; I want this character to have a Mix-style attack where they use up to three items and each one alters the attack they end up doing. I think I can muddle my way through it using common events and variables, but is there a way to set the ELEMENT of an attack in the course of the damage formula?
(My planned method is to have a webwork of Select Item options add numbers to a set of variables, which I'll throw together when the attack actually goes off)
Indinera

#134 Apr 8, 2021, 08:40 PM Source

if (b.isStateAffected(x)) tests if the target is affected by a given state, is there a way to test if a target is affected by a given buff/debuff?
Trihan

#135 Apr 8, 2021, 08:51 PM Source

Indinera said:
if (b.isStateAffected(x)) tests if the target is affected by a given state, is there a way to test if a target is affected by a given buff/debuff?
isBuffAffected and isDebuffAffected.
Indinera

#136 Apr 8, 2021, 08:53 PM Source

Thanks!
I suppose it needs to be isBuffAffected(x) to test a specific buff, right?
ScorchedGround

#137 Apr 8, 2021, 08:56 PM Source

@Indinera
I assume you just put in the ID of the parameter that is affected by the buff/debuff.

0-MaxHP,
1-MaxMP,
2-ATK,
3-DEF,
4-MAT,
5-MDEF,
6-AGI,
7-LUK
Indinera

#138 Apr 8, 2021, 08:59 PM Source

ScorchedGround said:
@Indinera
I assume you just put in the ID of the parameter that is affected by the buff/debuff.

0-MaxHP,
1-MaxMP,
2-ATK,
3-DEF,
4-MAT,
5-MDEF,
6-AGI,
7-LUK

Yep. If you'd like to test if a given target has a buff (any buff), is it possible without using || 8 times?
Trihan

#139 Apr 8, 2021, 09:10 PM Source

if ([0, 1, 2, 3, 4, 5, 6, 7].some(param => b.isBuffAffected(param)))
Indinera

#140 Apr 9, 2021, 07:39 AM Source
Is this written alright? I made a skill that:
* does 250 + 4*normal attack if spellcaster HP are less than 30%
* does 4*normal attack if HP are less than 50%
* does normal attack otherwise

So it has a double condition which I'm wondering if I wrote OK.
Code:
c=a.atk-b.def; a.hpRate()<0.5? (a.hpRate()<0.3? 250+4*c:4*c) : (a.atk-b.def);