AnimationNode.blend_input time parameter is ignored when not seeking.

[Pshy0]

Tested versions

• Reproducible in 4.3.dev6, 4.3.beta1, 4.3.beta3, 4.3.rc1, 4.3.stable, 4.4.dev3
• Even more broken in 4.1.4**, 4.2.1.stable**, 4.2.2**
• Not reproducible in 4.2.stable, 4.3-dev4, 4.3-dev5
• Not reproducible in 4.1.3.stable*, 4.1.4-rc1*, 4.1.4-rc2*, 4.1.4-rc3*

*: Mesh is broken in this version. **: This version is even more broken, animation reverses when not seeking. Mesh is also broken

System information

Godot v4.3.stable - Ubuntu 24.04.1 LTS 24.04 - X11 - Vulkan (Forward+)

Issue description

AnimationNode.blend_input has a time parameter which advance the connected input node when passing seek == true. When connected to an AnimationNodeAnimation, passing seek == false, the time parameter is ignored, the connected node not only does not advance, but the time parameter has no effect.

https://github.com/user-attachments/assets/ba88b9b3-cc3a-42c1-9396-f1cb8a32b13c

Steps to reproduce

In the MRP:

• Open Main.tscn - Select the AnimationTree - Tab into the AnimationTree editor - Select AnimationNodePass
• In the inspector, uncheck force_seek, and modify additional_blend_input_time to observe that the time parameter has no effect.

Minimal reproduction project (MRP)

mrp-non-seeking-blend_input.zip

[Pshy0]

Not reproducible in 4.1.4-rc3, 4.2.stable, 4.3-dev5, so this is a regression. Ill try other versions.

[Pshy0]

This is what happens in 4.2.1 and 4.2.2 The cube is supposed to have plain faces, so more is broken. The animation plays in reverse in those versions when not seeking: https://github.com/user-attachments/assets/bcf5e34c-b90d-47a6-9297-d0bbb00b022e

[matheusmdx]

Bisecting points to #87171 as the culprit, @TokageItLab

[TokageItLab]

This is not a regression, but rather a compatibility breakdown due to a major change in the time progression algorithm.

As I have written elsewhere, gdscript lacks struct and therefore lacks the information to pass time information from gdscript to animation node. So, as soon as struct is implemented, we plan to implement an API to handle this correctly, but I think there is no currently a way to make this work correctly

(blend_input() must return NodeTimeInfo and pass it to chained AnimationNodes, but only double values can be returned in gdscript)