How is crit damage applied?

[TheSimurghDidIt]

I'm looking over the skill trees and the like for the last 30 minutes or so of the download, and I'm seriously considering making an assassin multiclass character (though I've heard it's a little underpowered.)

 

But reading over everything, it occurred to me that I don't actually have any clue how exactly damage works. I assume most percentages are additive. I'm like 90% sure they are. But it occurs to me that crit damage might be an exception, and something I read sort of implies that it works somewhere along the lines of (1 + damage multiplier% + damage multiplier% + damage multiplier%) x (1 + crit multiplier% + crit multiplier% + crit multiplier%)

 

Is that correct? Or is crit multiplier just another damage multiplier that gets added to the others? Is there somewhere I can read how specifically damage is calculated? It'll make a pretty big difference in how I build things.

[nstgc]

Crit also adds along with all other damage modifiers that I know of. So far things stack like they did in PoE1.

[Boeroer]

Ctit is an additive weapon base damage modifier.

 

But a crit also raises your overall PEN by 50% which often leads to overpenetration, thus doing additional +30% additive damage.

[nstgc]

Ctit is an additive weapon base damage modifier.

 

But a crit also raises your overall PEN by 50% which often leads to overpenetration, thus doing additional +30% additive damage.

Or, more significantly, penetrating when an attack might not have (-75% ==> -0% is a huge leap)