1 Nov 2022

[UnrealEngine][開發日誌] 關於GAS中FAttributeSetInitterDiscreteLevels的神坑

by | posted in: UnrealEngine, 開發日誌 | 40

最近發現GAS的Attribute初始化時那張CurveTable，在打包版本時會把多餘的資料移除，造成FAttributeSetInitterDiscreteLevels在進行初始化時會失敗，猜測這個行為是在4.23以後(2020年3月的commit)的修改。

由於CurveTable本身設計是被用來當成連續型資料使用，因此進行重覆點的移除是可以理解的，因為可以減少個存的資料量進而增進效能，只要我們可以在2點之間利用內插法取得數值就行。

但是用在GAS的Attribute初始化上就出問題了，因為在GAS中他並不被當成連續型資料使用；而是轉成離散型資料，並以CurveTable上面的點進行屬性的分群。

移除重覆點，代表我們會遺失某個等級的資訊，例如當我們某個GAS Attribute在不同的等級上的數值都沒有變化，例如1~3級的移動速度都是200，他就只會保留等級1跟等級3，中間的等級2被當成重覆資料移除掉了。

當我們對等級2的角色進行屬性初始化時，就會因為找不到該等級資料而失敗。 這個議題比較噁心的點在於，它只會在打包版本發生，因為在editor中並沒有進行移除重覆資料的動作。 這個問題解決方法有幾種：        

1. 使用ConsoleVariable把CurveTable.RemoveRedundantKeys這個預設行為關閉，但會影響所有的CurveTable，造成這項優化失效。    

int32 CVar_CurveTable_RemoveRedundantKeys = 1;
static FAutoConsoleVariableRef CVarCurveTableRemoveRedundantKeys(TEXT("CurveTable.RemoveRedundantKeys"), CVar_CurveTable_RemoveRedundantKeys, TEXT(""), ECVF_Default);

2. 重新設計AttributeSetInitter，不要離散化，而是直接用CurveTable

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