Alexander Gavrilov
de662e7cd3
NLA strips support using the keyframe values in a variety of ways: adding, subtracting, multiplying, linearly mixing with the result of strips located below in the stack. This is intended for layering tweaks on top of a base animation. However, when inserting keyframes into such strips, it simply inserts the final value of the property, irrespective of these settings. This in fact makes the feature nearly useless. To fix this it is necessary to evaluate the NLA stack below the edited strip and correctly compute the raw key that would produce the intended final value, according to the mode and influence. Differential Revision: https://developer.blender.org/D3927