Version: 2019.3
Obsolete public static AnimationCurve GetEditorCurve (AnimationClip clip, string relativePath, Type type, string propertyName);
public static AnimationCurve GetEditorCurve (AnimationClip clip, EditorCurveBinding binding);

説明

binding 変数に結びついている float カーブを返します。

Unity は位置カーブ、スケールカーブ、回転カーブを内部で自動結合します

Thus transform curves always get combined and their keyframes is always the union of all keyframe points. In the Editor AnimationClip's let you specify special editor curves which do not get combined, thus it lets the user edit curves in a more intuitive way.

AnimationUtility.GetObjectReferenceCurve も参照してください。