HaveSpell(0) and Spell(LastSeenBy(Myself),0)

[pro5]

IF
Allegiance(Myself,ENEMY)
See(ThirdNearest([ENEMY]))
HaveSpell(0)
!Range(LastSeenBy(Myself),10)
THEN
RESPONSE #100
	Spell(LastSeenBy(Myself),0)
END

BG2 fixpack changes some of such blocks in original Bioware scripts, so I assumed they were meaningless or erroneous. But now I'm looking through some scripts in other mods, and find blocks like this (so someone used them on purpose). Can anyone knowledgable explain, how it works (if it works)?

[CamDawg]

Let's say I write a baf file like this:

 

IF
Allegiance(Myself,ENEMY)
See(ThirdNearest([ENEMY]))
HaveSpell(SPELL_FOO)
!Range(LastSeenBy(Myself),10)
THEN
RESPONSE #100
	Spell(LastSeenBy(Myself),SPELL_FOO)
END

 

When WeiDU goes to compile this, it will look for SPELL_FOO in spell.ids. If found, it'll substitute the numerical value for it (as the engine only understands the numerical value). If not it'll simply use zero, resulting in the code you've posted. These are usually caused by typos in spell references prior to compilation.

[pro5]

Hmm, I see. Thanks for explaining.

 

But why would they then be in a mod's BAF file which hasn't yet been compiled or decompiled by WeiDU? Weird.

[CamDawg]

Could be a myriad of reasons--they're using an entry that isn't present by default, it's just a normal typo, etc. Some of them can also be intentional:

 

IF
SpellCast([PC],0)
!GlobalTimerNotExpired("SpellsBad","GLOBAL")
Global("BribedCowled","GLOBAL",0)
GlobalLT("CowledWarning","GLOBAL",7)
THEN
RESPONSE #100
	CreateCreatureObjectDoor("COWENF2",LastTrigger,0,0,0) // Cowled Enforcer
	SetGlobalTimer("SpellsBad","GLOBAL",300)
END

 

^^ This block, present in every Athkatla (outdoor) area script, summons the Cowled Wizards when you cast spells. In his case, SpellCast([PC],0) will pick up any mage spell cast by a PC.

[Avenger]

HaveSpell(0) is most likely a result of decompiled script with bad IDS.

In that case, a bug.

 

It was probably a HaveSpellRES...