[AnimationTree Optimizer] .blend / .glb animation interpolation error

[RickyYCheng]

Tested versions

Godot v4.2.2.stable.mono - Windows 10.0.22631 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3050 Laptop GPU (NVIDIA; 31.0.15.2698) - AMD Ryzen 7 5800U with Radeon Graphics (16 Threads) Godot v4.3.beta3.mono - Windows 10.0.22631 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3050 Laptop GPU (NVIDIA; 31.0.15.2698) - AMD Ryzen 7 5800U with Radeon Graphics (16 Threads)

System information

Windows 10.0.22631 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3050 Laptop GPU (NVIDIA; 31.0.15.2698) - AMD Ryzen 7 5800U with Radeon Graphics (16 Threads)

Issue description

The animation imported in godot is not correct. I created a simple animation using cube in blender[v3.6 lts] and make interpolation of each frame be Constant. Then convert to .glb format. Import both .blend and .glb file into godot.

To import correctly, set FPS in godot to 15, same with blender.

godot 4.2.2 linear, lost internal frames

godot 4.3-beta3 nearest, but lost internal frames

blender

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After having some test, i found that if the optimizer is turned off while importing, the Constant anim would be ok (tested in 4.3).

Result. Godot 4.3-beta3, optimizer off

Import Setting: optimizer off

Import Settings: FPS set.

Steps to reproduce

See mrp.

Minimal reproduction project (MRP)

anim_test.zip

[RickyYCheng]

I modified the mr-project and reuploaded it since I referenced a blog, which told me to set the fps of godot and blender to a same value. But it does not work.

[RickyYCheng]

I just find it out and update the content. The correct way is to turn off the Optimizer of AnimationTree.

For Godot 4.3, I dont think this internal frames should be "optimized" in Constant/Nearest mode. And for Godot 4.2.2, the engine just ignored the Constant interpolation mode and just use Linear.