Add filter for AnimationNodeBlend3

[Daylily-Zeleen]

Befor:

blend3without_filtering.mp4

After:

blend3with_filering.mp4

Refer to this discussion.

[TokageItLab]

For consistency, it looks like Add3 needs the same fix.

[Daylily-Zeleen]

For consistency, it looks like Add3 needs the same fix.

I know that Add3 behabior is quite weird，but I still not found out the reason.

[TokageItLab]

Isn't it because of the extra REST that is added? I will send a Sub2 PR later.

[Daylily-Zeleen]

Isn't it because of the extra REST that is added? I will send a Sub2 PR later.

Yes, but it is quite complicated and I don't know how to fix it.

Will it be fixed In your Sub2 PR?

[TokageItLab]

See #76616.

[DMDoom]

Is anything happening with this? I checked these changes out in Godot 4.3 (more or less ef01922) and it works well. I see no reason why Add3 should have filtering and Blend3 not. I have not found any way to achieve the same result that Blend3 with filtering produces, and I find there are good use cases for this, e.g. blending player looking up/down with the current state machine animation — you'd only want to affect the upper body. You can do this with IK but I found this to be unnecessarily complex for my use, especially with more complicated models (not to mention SkeletonIK3D is deprecated, and skeleton modification stack was removed).