[Fallout 2] What is the formula for avoiding Random Encounters?

Discussion in 'Fallout RPG Gameplay & Tech' started by Sduibek, Dec 5, 2013.

  1. Sduibek

    Sduibek Creator of Fallout Fixt Moderator Modder

    Oct 27, 2010
    Does anyone know the actual equation or formula used in Fallout 2 engine for calculating whether an encounter can be avoided?

    I've found resources saying it's a roll against Outdoorsman and the Motion Sensor gives a +20% to the roll, but not much more detail than that.
     
    Last edited: Jan 4, 2019
  2. Svankensen

    Svankensen First time out of the vault

    May 5, 2012
    I believe that your travel speed is dependant on your outdoorsman skill. That means that you will still get fewer encounters with higher outdoorsman, meaning its safer to travel with a higher skill. At least i always raise my outdoorsman to very high levels before doing Navarro when i play (Hardcore), but then again you may be right.
     
  3. JimTheDinosaur

    JimTheDinosaur Vault Dweller
    Modder

    Mar 17, 2013
    Outdoorsman doesn't change travel speed, but even if it did it wouldn't reduce the amount of random encounters you get anyway, as it's processor speed (I think) that decides encounter frequency, not game time.
     
  4. Sduibek

    Sduibek Creator of Fallout Fixt Moderator Modder

    Oct 27, 2010
    Not sure about Fallout 2, but yeah Fallout 1 checks each certain number of "ticks" whether to load an encounter or not. Unfortunately it's hard-coded so it's pretty hard to figure out the equation without being able to read Assembly. Cubik2k's utility says default is 65 ticks, so I assume that means 6.5 seconds? I believe in Fallout 1 it's a flat value not based on CPU speed. From my experience it is dependent on Luck and that's about it.
     
    Last edited by a moderator: Dec 5, 2013
  5. Sduibek

    Sduibek Creator of Fallout Fixt Moderator Modder

    Oct 27, 2010
  6. Darek

    Darek is currently unavailable

    Jan 7, 2008
    I'm pretty sure Per Jorner wrote something about this, but his Fallout Guide seems to be down.
    Anyway, from my own experience I think it works something like this...

    The game takes your Outdoorsman skill (or a party member if any of theirs is higher), adds + 20 to that if you have the motion sensor (will add the bonus to a party member even if it's in your back pack). The sum will be capped off at 95 if the total exceeds that. Then it will subtract the encounter difficulty (between 0 and 70 depending on map tile), and what is left is your chance to avoid an encounter.

    I'm sure you already know the following bit, but just to be clear. :) If you look in WORLDMAP.TXT you can see that the world map is divided into 20 tiles (each containing 42 map squares). At the top of each tile section you will find the 'encounter_difficulty' for that set of map squares.

    So let's say you have Outdoorsman at 95 (with or without the motion sensor) and you are running around in a tile with an encounter difficulty of 0, you will have a 95% chance to avoid trouble. If you are in the toughest areas however (difficulty 70), you will only have a 25% chance to skip the encounter. The Outdoorsman skill (+ motion sensor) obviously has to be higher than the encounter difficulty, or there is no chance at all.

    Your trusty old car also comes with it's own built in encounter skipping system. But unfortunately for you it only works half the time. So if you are driving around in the car and you first fail the Outdoorsman check, the car will do a 50/50 roll (not a skill check), and if you pass, you can skip the encounter.

    Also, you get experience points for avoiding an encounter with the help of your Outdoorsman skill, but you get none from the car check. I suppose the logic is that it takes no skill to just put your foot down and accelerate away. Either that or the devs just forgot the XP (It's not like that kind of thing hasn't happened before). :lol:
     
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  7. Sduibek

    Sduibek Creator of Fallout Fixt Moderator Modder

    Oct 27, 2010
    Awesome, thanks! Also it's nice to see you again :D

    Just to clarify - even at outdoorsman 300% you'd still only have 25% chance to choose to avoid encounters in those difficult areas? That's a shame.
     
    Last edited: Jan 6, 2019
  8. Darek

    Darek is currently unavailable

    Jan 7, 2008
    Hello, been a while. :grin:

    Yeah you are correct. Because of the 95 cap, a too high Outdoorsman skill is pretty useless.
    That extra 50% roll check from the car does up the probability to 62.5% in your example though, so there is that.
     
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  9. Sduibek

    Sduibek Creator of Fallout Fixt Moderator Modder

    Oct 27, 2010
    Apparently the experience received for avoiding an encounter is 100XP + encounter zone difficulty (0XP to 70XP). That seems like a lot!
     
  10. Darek

    Darek is currently unavailable

    Jan 7, 2008
    Minus your Outdoorsman skill and Motion Sensor, again capped at 95. So the higher your skill, the less XP you get.

    The maximum XP you can get is 99, but that only happens when you have a 1% chance to pass the check.
    The minimum XP is 5% (in an area with an encounter difficulty of 0), but goes up proportionally with the encounter difficulty (with encounter difficulty 70 the minimum XP is 75).
     
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  11. Sduibek

    Sduibek Creator of Fallout Fixt Moderator Modder

    Oct 27, 2010
    Thanks!