Editing Talk:Pain state

This article needs information on pain threshold. See Quasar's note [[Talk:Monster infighting#Pain chance check?|here]].

== 100% pain chance ==

According to Dehacked (and the respective actor's entries here on the wiki), the player and Romero's head all have 255 pain chance. This is translated to 100%. But something is wrong. As I understand, pain chance is out of 256, which would mean that 255 pain chance would translate to 99.61%, not 100%. However, if we assume that pain chance is actually out of ''255'', then that throws off every ''other'' pain chance calculation. Examples:
*Arachnotron: 128 pain chance
**(128*100)/256=50% (agrees with wiki)
**(128*100)/255=50.20% (doesn't agree with wiki)
*Mancubus: 80 pain chance
**(80*100)/256=31.25% (agrees with wiki)
**(80*100)/255=31.37% (doesn't agree with wiki)
I could go on, but you get the idea. If pain chance is really out of 256 and not 255, then the real pain% for the player and Romero's head is (255*100)/256=99.61%. --[[User:Reaper with no name|Reaper with no name]] 04:33, 31 December 2008 (UTC)

: Very sensible.&nbsp; According to the article, this is where an actor does or does not enter its pain state (from P_DamageMobj):

    if ( (P_Random () < target->info->painchance)
         && !(target->flags&MF_SKULLFLY) )
    {
        target->flags |= MF_JUSTHIT;        // fight back!
        
        P_SetMobjState (target, target->info->painstate);
    }

: Therefore, AFAICT, what "255" really means is "what fraction of the entries in m_random.c are below 255?".&nbsp; The answer is 255/256 &asymp; 99.61%.&nbsp; For "80" it would be 79/256 &asymp; 30.86%.&nbsp;&nbsp;&nbsp; [[User:Ryan W|Ryan W]] 20:18, 8 January 2009 (UTC)

== Explanation ==
Pain chance is an 8-bit variable. That's 256 possibilities, from 0 to 255. 255 = 100%.
--[[Special:Contributions/162.123.17.80|162.123.17.80]] 16:33, 9 January 2009 (UTC)Jared

: I thought about that, but according to Dehacked, the Lost Soul has 256 pain chance. That's what makes me think it's unlikely, unless Dehacked messed it up somehow. But if pain chance is out of 255, then there's going to have be a lot of recalculation for all the monster's pain %'s. --[[User:Reaper with no name|Reaper with no name]] 17:05, 12 January 2009 (UTC)

:: "A lot"?&nbsp; Surely the wiki doesn't use these numbers anywhere besides the data tables in the monster articles.&nbsp; I'll be glad to redo those myself if we can agree on what the mistake is.&nbsp; :>&nbsp;&nbsp; Our tables seem to have been added originally by [[User:CyRaptor]] who I assume is long gone.&nbsp; However, in the source code, you can read the pain chance numbers (used in the excerpt above) from info.c.&nbsp; Romero's head indeed has 255, which means that your analysis is testable: for example, one could make a custom PWAD + demo in which Romero's head is hit by a pistol shot and doesn't react.&nbsp;&nbsp;&nbsp; [[User:Ryan W|Ryan W]] 00:16, 13 January 2009 (UTC)

If we look at m_random.c, There is also no number higher than 255 in the table. The header also states:

//
// M_Random
// Returns a 0-255 number
//

== RNG results ==

Following on to the first section of this talk page, here is the ''correct'' conversion:

{| {{prettytable}}
!Pain chance value||Pain state percentage
|-
|0||0.00%
|-
|1||0.78%
|-
|2||0.78%
|-
|3||1.56%
|-
|4||1.95%
|-
|5||2.34%
|-
|6||2.34%
|-
|7||2.34%
|-
|8||2.73%
|-
|9||3.13%
|-
|10||3.13%
|-
|11||3.13%
|-
|12||3.52%
|-
|13||3.52%
|-
|14||3.52%
|-
|15||3.91%
|-
|16||4.30%
|-
|17||4.69%
|-
|18||5.47%
|-
|19||5.47%
|-
|20||5.47%
|-
|21||6.25%
|-
|22||6.64%
|-
|23||7.03%
|-
|24||7.03%
|-
|25||7.42%
|-
|26||8.20%
|-
|27||8.59%
|-
|28||8.98%
|-
|29||9.77%
|-
|30||9.77%
|-
|31||9.77%
|-
|32||10.16%
|-
|33||10.16%
|-
|34||10.55%
|-
|35||10.55%
|-
|36||10.55%
|-
|37||11.33%
|-
|38||12.11%
|-
|39||12.11%
|-
|40||12.89%
|-
|41||12.89%
|-
|42||13.28%
|-
|43||14.06%
|-
|44||14.45%
|-
|45||14.45%
|-
|46||14.84%
|-
|47||15.63%
|-
|48||16.02%
|-
|49||16.41%
|-
|50||16.80%
|-
|51||17.58%
|-
|52||17.58%
|-
|53||18.75%
|-
|54||19.14%
|-
|55||19.53%
|-
|56||19.53%
|-
|57||19.92%
|-
|58||19.92%
|-
|59||20.31%
|-
|60||20.70%
|-
|61||21.48%
|-
|62||21.88%
|-
|63||22.27%
|-
|64||23.05%
|-
|65||23.05%
|-
|66||23.05%
|-
|67||23.83%
|-
|68||23.83%
|-
|69||24.22%
|-
|70||24.61%
|-
|71||26.17%
|-
|72||26.56%
|-
|73||26.56%
|-
|74||26.95%
|-
|75||27.34%
|-
|76||28.13%
|-
|77||28.52%
|-
|78||29.69%
|-
|79||30.08%
|-
|80||30.86%
|-
|81||31.64%
|-
|82||32.42%
|-
|83||32.81%
|-
|84||32.81%
|-
|85||33.59%
|-
|86||33.98%
|-
|87||34.38%
|-
|88||34.77%
|-
|89||34.77%
|-
|90||35.16%
|-
|91||35.55%
|-
|92||35.94%
|-
|93||36.33%
|-
|94||37.11%
|-
|95||37.50%
|-
|96||38.28%
|-
|97||38.67%
|-
|98||38.67%
|-
|99||39.84%
|-
|100||39.84%
|-
|101||39.84%
|-
|102||40.23%
|-
|103||40.23%
|-
|104||40.63%
|-
|105||41.02%
|-
|106||41.02%
|-
|107||41.80%
|-
|108||42.58%
|-
|109||42.97%
|-
|110||44.14%
|-
|111||44.53%
|-
|112||44.92%
|-
|113||45.31%
|-
|114||46.48%
|-
|115||46.88%
|-
|116||46.88%
|-
|117||46.88%
|-
|118||46.88%
|-
|119||47.27%
|-
|120||47.27%
|-
|121||48.44%
|-
|122||48.44%
|-
|123||48.83%
|-
|124||49.61%
|-
|125||49.61%
|-
|126||50.00%
|-
|127||50.00%
|-
|128||50.00%
|-
|129||50.78%
|-
|130||51.17%
|-
|131||51.17%
|-
|132||51.17%
|-
|133||51.17%
|-
|134||51.17%
|-
|135||51.17%
|-
|136||51.95%
|-
|137||52.73%
|-
|138||52.73%
|-
|139||53.91%
|-
|140||54.30%
|-
|141||55.47%
|-
|142||55.86%
|-
|143||55.86%
|-
|144||56.64%
|-
|145||56.64%
|-
|146||58.59%
|-
|147||59.38%
|-
|148||59.38%
|-
|149||59.38%
|-
|150||60.16%
|-
|151||60.16%
|-
|152||60.16%
|-
|153||60.55%
|-
|154||60.55%
|-
|155||60.94%
|-
|156||60.94%
|-
|157||61.72%
|-
|158||61.72%
|-
|159||61.72%
|-
|160||62.11%
|-
|161||62.11%
|-
|162||63.28%
|-
|163||63.28%
|-
|164||64.84%
|-
|165||65.23%
|-
|166||65.63%
|-
|167||66.80%
|-
|168||66.80%
|-
|169||67.58%
|-
|170||67.58%
|-
|171||67.97%
|-
|172||68.36%
|-
|173||68.36%
|-
|174||68.75%
|-
|175||68.75%
|-
|176||69.92%
|-
|177||70.31%
|-
|178||70.31%
|-
|179||70.70%
|-
|180||70.70%
|-
|181||70.70%
|-
|182||71.48%
|-
|183||72.27%
|-
|184||72.27%
|-
|185||73.05%
|-
|186||73.05%
|-
|187||73.44%
|-
|188||73.83%
|-
|189||74.22%
|-
|190||74.22%
|-
|191||75.00%
|-
|192||75.00%
|-
|193||75.00%
|-
|194||75.39%
|-
|195||75.78%
|-
|196||76.17%
|-
|197||76.95%
|-
|198||78.52%
|-
|199||79.30%
|-
|200||79.30%
|-
|201||79.69%
|-
|202||79.69%
|-
|203||80.47%
|-
|204||80.86%
|-
|205||80.86%
|-
|206||81.25%
|-
|207||81.64%
|-
|208||81.64%
|-
|209||81.64%
|-
|210||81.64%
|-
|211||81.64%
|-
|212||82.42%
|-
|213||83.59%
|-
|214||83.59%
|-
|215||83.59%
|-
|216||83.59%
|-
|217||83.98%
|-
|218||83.98%
|-
|219||83.98%
|-
|220||84.38%
|-
|221||84.77%
|-
|222||85.16%
|-
|223||85.94%
|-
|224||86.33%
|-
|225||87.50%
|-
|226||87.89%
|-
|227||88.67%
|-
|228||89.06%
|-
|229||89.06%
|-
|230||89.45%
|-
|231||89.45%
|-
|232||89.84%
|-
|233||90.23%
|-
|234||90.23%
|-
|235||90.23%
|-
|236||90.63%
|-
|237||91.02%
|-
|238||91.41%
|-
|239||91.41%
|-
|240||92.58%
|-
|241||92.58%
|-
|242||93.36%
|-
|243||94.53%
|-
|244||94.53%
|-
|245||94.92%
|-
|246||94.92%
|-
|247||95.31%
|-
|248||95.70%
|-
|249||96.09%
|-
|250||97.27%
|-
|251||97.66%
|-
|252||98.05%
|-
|253||98.44%
|-
|254||98.83%
|-
|255||99.61%
|-
|256||100.00%
|}

I believe this is already fixed in a few monster articles.&nbsp; I will check the others sooner or later, unless someone else does it first of course.&nbsp; :>&nbsp;&nbsp;&nbsp;&nbsp; [[User:Ryan W|Ryan W]] 23:55, 20 March 2014 (UTC)

It appears that this logic carries over exactly to Heretic.&nbsp; See {{c|P_DamageMobj()}} in {{c|P_INTER.C}}, {{c|rndtable[]}} and {{c|P_Random()}} in {{c|M_MISC.C}}.&nbsp;&nbsp;&nbsp; [[User:Ryan W|Ryan W]] ([[User talk:Ryan W|talk]]) 19:24, 11 March 2016 (CST)

For Hexen, it differs: the array of numbers ({{c|M_MISC.C}} lines 139-156) now includes ''one'' occurrence of each number 0-255.&nbsp; Therefore the prior approach of dividing pain chance values by 256 actually gives correct percentages.&nbsp; Other statements look unchanged: the conditional test is line 2056 of {{c|P_INTER.C}}, and {{c|P_Random()}} is line 1251 of {{c|H2DEF.H}} (except it's now a {{c|#define}} instead of a function, which I think only matters at a low level, below such things as actor behavior).&nbsp;&nbsp;&nbsp; [[User:Ryan W|Ryan W]] ([[User talk:Ryan W|talk]]) 20:47, 11 March 2016 (CST)

[[User:Quasar|Quasar]] has corroborated on IRC that Strife behaves the same as Doom in this regard.&nbsp; (Which ought to be good enough for everyone, except {{wp|Holy Crap|Francis Griffin}}.)&nbsp; E.g. in the Strife source from Chocolate v2.2.1, see line 1380 of {{c|p_inter.c}} and lines 29-59 of {{c|m_random.c}}.&nbsp;&nbsp;&nbsp; [[User:Ryan W|Ryan W]] ([[User talk:Ryan W|talk]]) 22:07, 11 March 2016 (CST)