"+ 2 accuracy" etc. Can anyone quantify?

[MythTrip]

I see "+2 melee" , +2 accuracy etc for some equipment bonuses. Can anyone scale this? What does +2 refer to? Is this a lot of melee bonus, or a little?

Need a sense of what this is to judge if a piece of equipment is a bargain or a rip off.

[Doombringer]

+1 = 5%

[your.sheepy]

Each +/-1 accuracy is 5%. The game only do accuracy in step of 5%, so those +2.5% accuracy of odd gunnery is wasted.

Also, when you are actually on the field, the whole thing is reversed: those weapons may now give you -2 to hit which actually mean +10% accuracy, while indirect fire is +3 which means -15% accuracy.

Easy and simple, yes?

[MythTrip]

So on the the field a -1 is actually +5% accuracy? Does this have to do with original die roll system, where lower number is better?

[your.sheepy]

Yeah, just remember the attack is rolled on a twenty-sided die. With hard-coded min hit chance (5%) and max hit chance (95%). I haven't played BattleTech but it's exactly like D&D (third edition up) and other d20 clones.

Well, the real picture is a lot more fancy than that. But I'll keep it simple here.

[Wantoomany]

Table top Battletech used 2d6 not a d20.

[DROPbear]

Its more a less trying to replicate TT dice rolls.

For example; +3 hit = 36% hit chance, +1 hit = 85% chance.

Tldr the hit chance does follow linear scaling.

[Sam Look]

Originally posted by your.sheepy:

Yeah, just remember the attack is rolled on a twenty-sided die. With hard-coded min hit chance (5%) and max hit chance (95%). I haven't played BattleTech but it's exactly like D&D (third edition up) and other d20 clones.

Well, the real picture is a lot more fancy than that. But I'll keep it simple here.

Has the D20 thing actually been stated anywhere by the developer?
My understanding is the 5% rounding is just a UI thing.

[your.sheepy]

Originally posted by Sam Look:

Has the D20 thing actually been stated anywhere by the developer?
My understanding is the 5% rounding is just a UI thing.

Well, since you asked. No, it's not a UI thing.

The "target" shot difficulty is hardcoded, in ToHit.GetUMChance. It will add 2.5% before flooring off to 5%, so the real target number always come in step of 5%. The code also caps the range to 5% - 95%.

Now that you have a hit chance, an attack roll is rolled. It is then "corrected" with a curve that make high rolls higher and low rolls lower. After that, if you missed the last shot, a streak breaker bonus is applied (the higher the last shot's chance, and the higher the miss streak, the higher the bonus). The final number is compared with the chance.

I have made a mode that can already fine tune the roll correction and streak breaker, with an independent log to verify the numbers.

https://www.nexusmods.com/battletech/mods/242

I am also working on an update that controlls the hit chance part, for example to remove the stepping, change the min/max cap, allow bonus to increase accuracy beyond the base, and/or to change how modifiers are applied.

https://github.com/Sheep-y/BattleTech_Mods/releases

I won't link to the 58000 srm I tested before starting the mod, which also comfirms that those +2.5% gunnery stats are wasted without modding.