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Final Fantasy IV Research & Development / HP Damage Algo
« on: March 20, 2008, 11:43:37 AM »
Refer to this thread for the start of my idea, but it wasn't fully fleshed out - http://slickproductions.org/forum/index.php?topic=390.0
This thread is an appendix to the magic algo, since the majority of that has an impact depending on resistances...
Onto the algo...
HP Power (HP attack based on caster) = Caster's Current HP
HP Power (HP attack based on target) = Target's Max HP
Base HP Spell Power = Whatever is normally listed in the spell power slot
Base HP Absorb Spell Power = Whatever is normally listed next to the spell power data (**default: 100/Base HP Spell Power)
****Base HP Spell Hit Rate = Whatever is normally listed in the hit rate slot
**Note: Not sure if that always have to be defined like that, but it is there anyways...
****Note: Make sure to subtract 128 if it uses the boss bit
HP Spell Power Elemental Modifier (HP attack based on target):
Target is Weak to Element, HP Spell Power = 2
Target is Resistant to Element, HP Spell Power = 10
**Target is Immune to Element, HP Spell Power = 10
**Target Absorbs Element, HP Spell Power = Base HP Spell Power * -1
Unapplicable, HP Spell Power = Base HP Spell Power
HP Spell Power Elemental Modifier (HP attack based on caster):
Target is Weak to Element, HP Spell Power = Base HP Spell Power * 2
Target is Resistant to Element, HP Spell Power = Base HP Spell Power / 2
**Target is Immune to Element, HP Spell Power = Caster's Current HP
**Target Absorbs Element, HP Spell Power = Base HP Spell Power * -1
Unapplicable, HP Spell Power = Base HP Spell Power
**Note: In the SNES version, Immunity has precedence over Absorb. In the GBA version, Absorb has precedence over Immunity.
HP Based Damage Bonus:
HP attack based on target, HP Damage Bonus = 0
HP attack based on caster, HP Damage Bonus = (Caster's Current HP/ HP Spell Power * rand (100, 150) / 100) % 256
Basic Formula - Includes Weakness, Resistance, and Immunity (SNES and GBA versions):
Absorb Formula (SNES version):
Use Base HP Absorb Spell Power and plug that into the general magic algo as the Base Spell Power: http://slickproductions.org/forum/index.php?topic=329.0
Absorb Formula (GBA version):
If the spell is single targeted...
HP Absorb Spell Power = Base HP Absorb Spell Power * 3/2
Target's Magic Defense = 0
Target's Magic Evade = 0
Plug in HP Absorb Spell Power into the general magic algo as the Base Spell Power: http://slickproductions.org/forum/index.php?topic=329.0
Note: This isn't really known quite yet...
If the spell is multitargeted...
Damage = Base HP Power / HP Spell Power + HP Damage Bonus
This thread is an appendix to the magic algo, since the majority of that has an impact depending on resistances...
Onto the algo...
HP Power (HP attack based on caster) = Caster's Current HP
HP Power (HP attack based on target) = Target's Max HP
Base HP Spell Power = Whatever is normally listed in the spell power slot
Base HP Absorb Spell Power = Whatever is normally listed next to the spell power data (**default: 100/Base HP Spell Power)
****Base HP Spell Hit Rate = Whatever is normally listed in the hit rate slot
**Note: Not sure if that always have to be defined like that, but it is there anyways...
****Note: Make sure to subtract 128 if it uses the boss bit
HP Spell Power Elemental Modifier (HP attack based on target):
Target is Weak to Element, HP Spell Power = 2
Target is Resistant to Element, HP Spell Power = 10
**Target is Immune to Element, HP Spell Power = 10
**Target Absorbs Element, HP Spell Power = Base HP Spell Power * -1
Unapplicable, HP Spell Power = Base HP Spell Power
HP Spell Power Elemental Modifier (HP attack based on caster):
Target is Weak to Element, HP Spell Power = Base HP Spell Power * 2
Target is Resistant to Element, HP Spell Power = Base HP Spell Power / 2
**Target is Immune to Element, HP Spell Power = Caster's Current HP
**Target Absorbs Element, HP Spell Power = Base HP Spell Power * -1
Unapplicable, HP Spell Power = Base HP Spell Power
**Note: In the SNES version, Immunity has precedence over Absorb. In the GBA version, Absorb has precedence over Immunity.
HP Based Damage Bonus:
HP attack based on target, HP Damage Bonus = 0
HP attack based on caster, HP Damage Bonus = (Caster's Current HP/ HP Spell Power * rand (100, 150) / 100) % 256
Basic Formula - Includes Weakness, Resistance, and Immunity (SNES and GBA versions):
Code: [Select]
//skip loop if using the GBA version...
while (Spell Multiplier > 0)
{
if(Target's Magic Defense Multiplier == 0)
{
Success = true
break;
}
while(Target's Magic Defense Multiplier > 0)
{
Target's Magic Defense Multiplier--;
if (rand(0, 99) > HP Spell Hit Rate) || (rand(0, 99) < Target's Magic Evade))
{
break;
}
}
Spell Multiplier--;
}
if (Success) //only applies to SNES version
{
Damage = Base HP Power / HP Spell Power + HP Damage Bonus
}
Absorb Formula (SNES version):
Use Base HP Absorb Spell Power and plug that into the general magic algo as the Base Spell Power: http://slickproductions.org/forum/index.php?topic=329.0
Absorb Formula (GBA version):
If the spell is single targeted...
HP Absorb Spell Power = Base HP Absorb Spell Power * 3/2
Target's Magic Defense = 0
Target's Magic Evade = 0
Plug in HP Absorb Spell Power into the general magic algo as the Base Spell Power: http://slickproductions.org/forum/index.php?topic=329.0
Note: This isn't really known quite yet...
If the spell is multitargeted...
Damage = Base HP Power / HP Spell Power + HP Damage Bonus