MaxScript 清除超出范围的关键帧

最近在unity3d中使用魔兽世界的导出资源时，发现有些动画会有一些莫名其妙的残留帧，导致一个动作导进unity3d后的长度变成几分钟，并且很大一部分是毫无动作的，所以写了这个脚本来清除多余的帧。

Fn CleanOutRangeKeys inputObject = 
(
    startTime = AnimationRange.Start
    endTime = AnimationRange.End
    for i = 1 to inputObject.numSubs do
    (
        tempSubAnim = GetSubAnim inputObject i
        tempController = tempSubAnim.Controller
        
        if tempController != undefined do
        (
            tempKeyList = tempController.Keys
            
            outEndKeysIndex = for i = 1 to tempKeyList.Count where tempKeyList[i].Time > endTime collect i
            if outEndKeysIndex.Count > 0 do for i = 1 to outEndKeysIndex.Count do DeleteKey tempKeyList tempKeyList.count
            
            outStartKeysIndex = for i = 1 to tempKeyList.Count where  tempKeyList[i].Time < startTime collect i
            for i = 1 to outStartKeysIndex.Count do DeleteKey tempKeyList 1
        )
        if tempSubAnim.numSubs > 0 do CleanOutRangeKeys tempSubAnim
    )
)
for tempObject in Objects as Array do CleanOutRangeKeys tempObject