Originally posted by Artfunkel:

I've pushed a branch which integrates Action Slots into the import and export process. It's a core change to the addon so I'd appreciate some testing before I release it.

https://github.com/Artfunkel/BlenderSourceTools/tree/action_slots

Not sure about Python or Git? Download the code[github.com] and copy the io_scene_valvesource folder to %appdata%\Blender Foundation\Blender\4.4\scripts\addons.

Seems to work just fine, at least in my use case.

Armature and keyframes will import but the keyframes are empty and don't deform the model at all.

:/

https://gofile.io/d/iIgzTD
Here

I'm trying to deal with TF2 player animations. In this case, it's for Demoman's grenade launcher.

When compiling the source animation with Crowbar it correctly animates the cylinder and barrel when reloading or firing, but when imported the weapon_bone's are missing from teh rig, and when exported via Blender Source Tools with no modification the animation comes out 70kb lighter and the gun is no longer animated when recompiled with the new animation.

What I noticed is that some animations import fine with these bones intact, for example Spy's revolver animations are correctly imported but are still about 10kb lighter than the source file when exported. Maybe some other stuff getting lost too?

Unfortunately I do not have Maya so I cannot test these with Valve's official tools. :/