Originally Posted by
daelyn
Anything that affects critical damage only is additive with Surge (as Bleedout under the new system would be). Anything that affects total damage (as Bleedout is currently bugged to) is multiplicative with the base damage. Ie. if we have an effect that deals 100 damage and we have 10% crit for 50% damage, and we had two effects, one that increased total damage by 30% and one that increased crit damage by 30%, we have:
Base damage = 100 * (1 + Crit * Surge) = 100 * (1 + 0.1 * 0.5) = 100 * 1.05 = 105 damage
With 30% damage = (100*1.3) * (1 + Crit * Surge) = 130*1.05 = 136.5 damage
With 30% crit damage = 100 * (1 + Crit * (Surge + 0.3)) = 100 * (1 + 0.1 * (0.5 + 0.3)) = 100 * (1 + 0.1 * 0.8) = 100 * 1.08 = 108 damage
You can easily test this in-game with crit damage increasing talents.
On a side note, if it looks odd, multiplying average non-crit damage by (1 + Crit * Surge), with crit being your percentage crit change and surge being the portion of your crit modifier greater than 100% (ie. if your crit multiplier is 162%, Surge in this case would be 62%), gives you your averaged damage including crits. You can actually prove this with a little algebra starting from the more intuitive equation:
AverageDamage = NonCritAvg * Crit * (1 + Surge) + NonCritAvg * (1 - Crit)