### Hit Probability

Posted:

**Sat May 03, 2008 7:58 am**This topic is not really modding-related, bit I've decided to put every BotF info thread into this forum, for better clearness and easier search

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The file tevent.txt, which itself seems to be triggered by the F11 cheat, contains tactical detail about every shot fired during tactical combat. It also lists a "Hit Probability" for each shot.

The formula for the hit probability turned out to be very simple:

(rounded to a whole percent number, rounding is exact, not simple cutting)

with

ATK: beam accuracy (also called "attack level") of attacker (including crew experience bonus)

DEF: defense level of target (including crew experience bonus)

If the result is smaller than 0.0%, then it's set to 0.0%.

The result can be greater than 100.0%, which is unusual for a "probability".

Although the "Hit Probability" is always rounded to a whole number, it's displayed with one decimal place, like "74.0%" or "82.0%" or "206.0%".

However, the actual chance to hit the target doesn't seem the same as the "Hit Probability", although the name would imply this. What I've observed so far:

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The file tevent.txt, which itself seems to be triggered by the F11 cheat, contains tactical detail about every shot fired during tactical combat. It also lists a "Hit Probability" for each shot.

The formula for the hit probability turned out to be very simple:

**[Hit Probability in percent] = ATK - DEF - ( 0.01 * [distance between attacker and target] )**(rounded to a whole percent number, rounding is exact, not simple cutting)

with

ATK: beam accuracy (also called "attack level") of attacker (including crew experience bonus)

DEF: defense level of target (including crew experience bonus)

If the result is smaller than 0.0%, then it's set to 0.0%.

The result can be greater than 100.0%, which is unusual for a "probability".

Although the "Hit Probability" is always rounded to a whole number, it's displayed with one decimal place, like "74.0%" or "82.0%" or "206.0%".

However, the actual chance to hit the target doesn't seem the same as the "Hit Probability", although the name would imply this. What I've observed so far:

- Shots with a Hit Prob. of more than 100% sometimes missed, but only if the target was outside of the maximum beam weapon range.
- On the other hand, shots at targets beyond the maximum beam weapon range sometimes hit.
- Generally quite a lot of shots with a Hit Prob. close to 100% still miss, maybe it has something to do with the maximum beam weapon range.
- Shots with a Hit Prob. of 0.0% never hit.
- The actual damage seems to depend on the Hit Probability, at least to some extent.
- The actual damage sometimes varies in identical situations (random value involved?).
- A beam that hits never does 0 damage. Maybe some (or all) misses in tevent.txt are just hits that do 0 damage.
- It's likely that the "Evade" command also has some influence.