Amiibo drops

Drop tables

Idx	Name	Description
0	Normal
1	Normal2
2	SmallHit
3	SmallHit2
4	BigHit
5	BigHit2
6	GreatHit
7	GreatHit2

Notes on AmiiboMgr

amiibo code call AmiiboMgr::registerAmiibo^{[unofficial name]} every time an amiibo is used.

• AIDef:Action/CreateEpona calls it after Epona has been spawned.
• AIDef:AI/WolfLinkAmiibo too, after spawning Wolf Link.
• AIDef:Action/ItemAmiiboSelectDropTable registers an amiibo as soon as it is scanned.

registerAmiibo

• First, AmiiboMgr determines if it should reset its daily amiibo use history (stored in the AmiiboTouchHistory flag).
  • If less than 86400 seconds (1 day) have elapsed since the game was launched, don't do anything.^[check]
  • AmiiboMgr then computes 10000 * now.year + 100 * now.month + now.day. If the value is different from AmiiboLastTouchDate (which would mean that a day has elapsed), the AmiiboTouchHistory array is cleared.
• The amiibo UID is inserted into AmiiboTouchHistory. Only the last 100 entries are kept.
• It is also inserted into AmiiboTouchHistoryTotal. Only the last 200 entries are kept.
• Finally, AmiiboLastTouchDate is set to 10000 * now.year + 100 * now.month + now.day.

Logic

Drop rates and drop num

AIDef:Action/ItemAmiiboCreateFromDropTable (the action that is responsible for determining the drop table and spawning the drops) follows the following process:

• Get the number of times the amiibo has been scanned for the current day (using AmiiboTouchHistory): $scanCount
• Get the number of times the amiibo has been scanned (using AmiiboTouchHistoryTotal): $scanCountTotal

• Determine the drop table category to use.
  • Remain if Find_4Relic_1stClear is set
  • Parasail if IsGet_PlayerStole2 is set
  • Normal otherwise

• Calculate the "adjust rate"
  • When the amiibo has been scanned 0 to $HitRateAdjustStart times, the adjust rate is 0%.
  • This value increases linearly and reaches its maximum (100%) when the amiibo scan count is >= $HitRateAdjustEnd.
  • In practice, because HitRateAdjustStart and HitRateAdjustEnd are both set to the same value (5), the formula can be simplified: the rate is 100% if $scanCountTotal >= $HitRateAdjustEnd and 0% otherwise.

• Determine if there should be a Great Hit (RNG)
  • If $scanCount is <2, use GreatHitRate1st as the probability of getting a Great Hit.
  • If $scanCount is 2, use GreatHitRate2nd.
  • If $scanCount is 3, use GreatHitRate3rd.
  • In these three cases, if the great hit rate is >0.0, add adjustRate * (100.0 - greatHitRate) to the great hit rate.
  • Otherwise, if $scanCount is >3, the great hit rate is 0%.

• If there was no Great Hit, determine if there should be a Big Hit (no RNG)
  • If $scanCount <= 3, a Big Hit is guaranteed.
  • If $scanCount >= 4, a Big Hit will never happen.

• Determine if there should be a Small Hit (RNG)
  • If $scanCount is <2, use SmallHitRate1st.
  • If $scanCount is 2, use SmallHitRate2nd.
  • If $scanCount is 3, use SmallHitRate3rd.
  • Otherwise, if $scanCount is >3, the small hit rate is 0%.

• Determine the drop num rate
  • If $scanCount is <2, use DropNumRate1st.
  • If $scanCount is 2, use DropNumRate2nd.
  • If $scanCount is 3, use DropNumRate3rd.
  • Otherwise, if $scanCount is >3, the drop num rate is 0%.

• For each drop table ({Normal,SmallHit,BigHit,GreatHit}{,2}), calculate the actual drop num.
  • 0 if the table doesn't exist in the bdrop
  • max(1, (dropNumRate * repeatNum) / 100.0) otherwise
  • Note: For BigHit and GreatHit tables, (Remain), (Parasail) or (Normal) are appended to the table name.

• Fix the drop nums based on the RNG results

Final drop nums after RNG (note: negative values are set to 0)

	Normal	Normal2	SmallHit	SmallHit2	BigHit	BigHit2	GreatHit	GreatHit2
GH, no BH, no SH, Normal2 != 0	N - (GH+GH2)/2	N2 - (GH+GH2)/2	0	0	0	0	GH	GH2
GH, no BH, no SH, Normal2 = 0	N - (GH+GH2)	0	0	0	0	0	GH	GH2
GH, no BH, SH, Normal2 != 0	N - (GH+GH2)/2	N2 - (GH+GH2)/2	SH	SH2	0	0	GH	GH2
GH, no BH, SH, Normal2 = 0	N - (GH+GH2)	0	SH	SH2	0	0	GH	GH2
No GH, BH, no SH, Normal2 != 0	N - (BH+BH2)/2	N2 - (BH+BH2/2)	0	0	BH	BH2	0	0
No GH, BH, no SH, Normal2 = 0	N - (BH+BH2)	0	0	0	BH	BH2	0	0
No GH, BH, SH, Normal2 != 0	N - (BH+BH2)/2	N2 - (BH+BH2/2)	SH	SH2	BH	BH2	0	0
No GH, BH, SH, Normal2 = 0	N - (BH+BH2)	0	SH	SH2	BH	BH2	0	0
No GH, no BH, SH	N	N2	SH	SH2	0	0	0	0
No GH, no BH, no SH	N	N2	0	0	0	0	0	0