Difference between revisions of "Strength weight"
Buddy23Lee (talk | contribs) (Attribute -> game mechanic. Added appropriate category) |
(added formulas. dived and referenced the convoluted source. then did some algebra to get the formulas in a hopefully more palatable form (doesn't this wiki need Tex?) I leave it to other editors to decide whether this is horribly overdone or inaccurate) |
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Generally in Crawl, heavier weapons benefit more from [[strength]] than from [[dexterity]], and also tend to require more strength to use properly. '''Strength weighting''' (abbreviated "str weight") is a game mechanic that determines relatively how much a character's strength and dexterity affect a given weapon's damage output. | Generally in Crawl, heavier weapons benefit more from [[strength]] than from [[dexterity]], and also tend to require more strength to use properly. '''Strength weighting''' (abbreviated "str weight") is a game mechanic that determines relatively how much a character's strength and dexterity affect a given weapon's damage output. | ||
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Almost all weapons fall somewhere in-between the two extremes. The weighted average of strength and dexterity affects both damage potential and [[to-hit]], the former being affected more by strength and the latter being affected more by dexterity. Thus, note that that even 0% and 100% strength weightings don't imply that either stat has no effect: more dexterity always implies better to-hit and more strength always implies higher per-hit damage. A 50% str weight still implies that dexterity has a bigger effect than strength on to-hit, and conversely with strength and damage. | Almost all weapons fall somewhere in-between the two extremes. The weighted average of strength and dexterity affects both damage potential and [[to-hit]], the former being affected more by strength and the latter being affected more by dexterity. Thus, note that that even 0% and 100% strength weightings don't imply that either stat has no effect: more dexterity always implies better to-hit and more strength always implies higher per-hit damage. A 50% str weight still implies that dexterity has a bigger effect than strength on to-hit, and conversely with strength and damage. | ||
| + | |||
| + | == Formulas and source == | ||
| + | [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/itemprop.cc#L163 In the source] | ||
| + | strength weight fractions are represented by integers from 0 to 10, representing 0% to 100% respectively. In the formulas below, '''W''' denotes strength weight as a fraction, ie. W=0.0 for quickblade and W=1.0 for giant club. | ||
| + | === Melee === | ||
| + | In the 0.12 source, melee damage is calculated a bit differently for | ||
| + | [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/melee_attack.cc#L5274 monsters] | ||
| + | and player characters. Player damage potential is | ||
| + | [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/melee_attack.cc#L5367 based on weapon base damage] and, among other things, | ||
| + | [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/melee_attack.cc#L1606 amplified by a stat value] | ||
| + | which is taken as a | ||
| + | [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/melee_attack.cc#L5494 blend between the player's Str and Dex]: | ||
| + | |||
| + | <tt>'''Melee damage blended stat''' = 0.5×Str + 0.5(W×Str + (1-W)Dex)</tt> | ||
| + | |||
| + | Stats are blended [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/melee_attack.cc#L5149 similiarly for to-hit] | ||
| + | but conversely to damage calculations, dexterity counts twice as heavily towards to-hit as strength does: | ||
| + | |||
| + | <tt>'''Melee to-hit blended stat''' = 0.5×Dex + 0.5(W×Str + (1-W)Dex)</tt> | ||
| + | |||
| + | === Launchers === | ||
| + | The [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/throw.cc#L1346 code for player-fired missile] | ||
| + | damage and to hit is even harder to decypher than for melee weapons. Strength and dexterity | ||
| + | [https://gitorious.org/crawl/crawl/source/3fb7fd9f23f7f93a1e85b39c3ba46f27e91505f3:crawl-ref/source/throw.cc#L545 primarily affect] | ||
| + | the launcher "speed". "Speed" is a misnomer though: it means the amount of in-game time taken to fire a shot, not the rate at which shots are fired. Roughly: | ||
| + | |||
| + | <tt>'''Turns taken''' = ( launcher_base_attack_delay_percentile - player_skill×(W×Str + (W-1)×Dex)×4/25 ) / 100</tt> | ||
[[Category:Game mechanics]] | [[Category:Game mechanics]] | ||
Revision as of 17:06, 17 September 2013
Generally in Crawl, heavier weapons benefit more from strength than from dexterity, and also tend to require more strength to use properly. Strength weighting (abbreviated "str weight") is a game mechanic that determines relatively how much a character's strength and dexterity affect a given weapon's damage output.
A given str weight value can be viewed as a quotient expressed as a percentage; the "amount of effect" that strength has on a weapon, divided by the total amount of effect that strength and dexterity together have on it. So a str weight of 100% (such as with a giant club) implies that strength is all that really matters when using it. Conversely, 0% (eg. quick blade) implies that strength has a very small effect on how well a weapon performs.
Almost all weapons fall somewhere in-between the two extremes. The weighted average of strength and dexterity affects both damage potential and to-hit, the former being affected more by strength and the latter being affected more by dexterity. Thus, note that that even 0% and 100% strength weightings don't imply that either stat has no effect: more dexterity always implies better to-hit and more strength always implies higher per-hit damage. A 50% str weight still implies that dexterity has a bigger effect than strength on to-hit, and conversely with strength and damage.
Formulas and source
In the source strength weight fractions are represented by integers from 0 to 10, representing 0% to 100% respectively. In the formulas below, W denotes strength weight as a fraction, ie. W=0.0 for quickblade and W=1.0 for giant club.
Melee
In the 0.12 source, melee damage is calculated a bit differently for monsters and player characters. Player damage potential is based on weapon base damage and, among other things, amplified by a stat value which is taken as a blend between the player's Str and Dex:
Melee damage blended stat = 0.5×Str + 0.5(W×Str + (1-W)Dex)
Stats are blended similiarly for to-hit but conversely to damage calculations, dexterity counts twice as heavily towards to-hit as strength does:
Melee to-hit blended stat = 0.5×Dex + 0.5(W×Str + (1-W)Dex)
Launchers
The code for player-fired missile damage and to hit is even harder to decypher than for melee weapons. Strength and dexterity primarily affect the launcher "speed". "Speed" is a misnomer though: it means the amount of in-game time taken to fire a shot, not the rate at which shots are fired. Roughly:
Turns taken = ( launcher_base_attack_delay_percentile - player_skill×(W×Str + (W-1)×Dex)×4/25 ) / 100
