Salvage: Fix Anim Tree blending inconsistency #53903
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Co-authored-by: Marios Staikopoulos marios@staik.net
This PR is a salvage of #34134. This will break compatibility with the old NodeAdd.
Fixed #37661. And it may fixes #34694.
2021-10-17.9.17.01-1.mov
In the first blending, the translation looks strange, but this is due to a change in #53689. This requires a new implementation of blending when no track exists, separately from this PR.
The second blending also looks broken at first look, but since the similar pose is applied twice, which is the correct behavior. Moreover, this change makes the proposal godotengine/godot-proposals#2700 worthwhile in conjunction with #53765.
In other words, godotengine/godot-proposals#2700 mentioned a problem with the previous animation system which the base pose for extracting additive animations was completely fixed on import, but this has been removed by #53765. The correct extraction of additive animation can now be done by implementing NodeSub or by setting the base pose as an optional parameter in NodeAdd.