How do I change the chance of reading a skill book?

[cyber 0]

I want to make reading skill books harder. how can I do that ?

[b6d4a82c15 298]

Take a look at this function from char_skill.cpp

bool CHARACTER::LearnSkillByBook(DWORD dwSkillVnum, BYTE bProb)

It's called by the server whenever you read a standard skill book (VNUM 50300).

Regarding your question: success chance is often retrieved from value0 column belonging to a given skillbook but this isn't always the case so you can use "Find all references" on LearnSkillByBook func to see how it's called.

In case of a standard skill book it seems like there's no bProb argument provided so it's hardcoded to 65%, search for this bit

int need_bookcount = GetSkillLevel(dwSkillVnum) - 20;

and you'll see

				int percent = 65;

				if (FindAffect(AFFECT_SKILL_BOOK_BONUS))
				{
					percent = 0;
					RemoveAffect(AFFECT_SKILL_BOOK_BONUS);
				}

				if (number(1, 100) > percent)
				{
(...)

But like I said before sometimes this function is also sometimes called with the second argument (bProb) provided and this is our success chance. It's often modified by special items and whatnot. 

Grand master skills obviously have a separate routine (LearnGrandMasterSkill) dedicated to chance calculation.

Edited May 5, 2024 by b6d4a82c15

[Borr 0]

On 5/5/2024 at 8:08 PM, b6d4a82c15 said:

Take a look at this function from char_skill.cpp

bool CHARACTER::LearnSkillByBook(DWORD dwSkillVnum, BYTE bProb)

It's called by the server whenever you read a standard skill book (VNUM 50300).

Regarding your question: success chance is often retrieved from value0 column belonging to a given skillbook but this isn't always the case so you can use "Find all references" on LearnSkillByBook func to see how it's called.

In case of a standard skill book it seems like there's no bProb argument provided so it's hardcoded to 65%, search for this bit

int need_bookcount = GetSkillLevel(dwSkillVnum) - 20;

and you'll see

				int percent = 65;

				if (FindAffect(AFFECT_SKILL_BOOK_BONUS))
				{
					percent = 0;
					RemoveAffect(AFFECT_SKILL_BOOK_BONUS);
				}

				if (number(1, 100) > percent)
				{
(...)

But like I said before sometimes this function is also sometimes called with the second argument (bProb) provided and this is our success chance. It's often modified by special items and whatnot. 

Grand master skills obviously have a separate routine (LearnGrandMasterSkill) dedicated to chance calculation.

the sucess rate is 35%, not 65.
 

 

On 5/5/2024 at 1:27 PM, cyber said:

I want to make reading skill books harder. how can I do that ?

where is 65 on the code highlighted by our friend, u can change by any hate u want, only remember that the code as it is check if the random number is higher then (percent) so, to get harder u should increase the percent number...

[b6d4a82c15 298]

20 hours ago, Borr said:

the sucess rate is 35%, not 65.
 

 

where is 65 on the code highlighted by our friend, u can change by any hate u want, only remember that the code as it is check if the random number is higher then (percent) so, to get harder u should increase the percent number...

Oh yeah, you're right it's actually 100-65=35, sorry