Hero's skill aquire algorithm

[crypt47]

Your question

My personal fun is to beaf up heroes with the skills I like. I often replay the game if lousy skill drops. I would like to know if the order of the skills is pregenerated on some point (seeding) or there is a way to influence the game engine to produce another skill? Thanks.

Additional info

No response

[oleg-derevenetz]

The order of skills depends on the initial map seed (which is generated when the new game is started) and pre-defined for a given hero. See this method for details and comments:

fheroes2/src/fheroes2/heroes/heroes.cpp

Lines 2170 to 2201 in 4fd43fb

	Heroes::HeroSeedsForLevelUp Heroes::GetSeedsForLevelUp() const
	{
	/* We generate seeds based on the hero and global world map seed
	* The idea is that, we want the skill selection to be randomized at each map restart,
	* but deterministic for a given hero.
	* We also want the available skills to change depending on current skills/stats of the hero,
	* to avoid giving out the same skills/stats at each level up. We can't use the level field for this, as it
	* doesn't change when we level up several levels at once.
	* We also need to generate different seeds for each possible call to the random number generator,
	* in order to avoid always drawing the same random number at level-up: otherwise this
	* would mean that for all possible games, the 2nd secondary
	* skill would always be the same once the 1st one is selected.
	* */
	uint32_t hash = world.GetMapSeed();
	fheroes2::hashCombine( hash, _id );
	fheroes2::hashCombine( hash, _race );
	fheroes2::hashCombine( hash, attack );
	fheroes2::hashCombine( hash, defense );
	fheroes2::hashCombine( hash, power );
	fheroes2::hashCombine( hash, knowledge );
	for ( int skillId = Skill::Secondary::PATHFINDING; skillId <= Skill::Secondary::ESTATES; ++skillId ) {
	fheroes2::hashCombine( hash, GetLevelSkill( skillId ) );
	}
	HeroSeedsForLevelUp seeds;
	seeds.seedPrimarySkill = hash;
	seeds.seedSecondarySkill1 = hash + 1;
	seeds.seedSecondarySkill2 = hash + 2;
	seeds.seedSecondarySkillRandomChoose = hash + 3;
	return seeds;
	}

[crypt47]

Yes, I see. The only way to change upcomming choice is to upgrade hero skills without raising experience. It's a pitty that choice doesn't necessarily include one skill that was already selected before.

[ihhub]

Moving this to the discussion section.

[crypt47]

@oleg-derevenetz regarding my previous question in this topic. I think, maybe I'll manage to patch the game a bit for myself. Could you point me to the header file where secondary skill's IDs are defined? Which method can I use to check if the current hero is a player or a computer?

[oleg-derevenetz]

Please see the src/fheroes2/heroes/skill.h for skill IDs and isControlAI() method of Heroes class (ultimately inherited from the Control class) to check if a hero is controlled by AI or not.

[crypt47]

Thank you, I removed for a player MYSTICISM, EAGLE_EYE, SCOUTING and ESTATES as these skills needs to be beefed up to be of any interest. I also removed NECROMANCY as I don't play for undeads. I also tried to put a condition so that already acquired skills will grow up, but for some reason it didn't work. https://github.com/ihhub/fheroes2/blob/master/src/fheroes2/heroes/skill.cpp#L774

if ( skill.Level() == Level::NONE && skill.Skill() == Skill::Secondary::MYSTICISM ) { blacklist.insert( Skill::Secondary::MYSTICISM ); }