FBX Animations don't support disconnected bones

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#1

I am trying to import a rigged animation from Blender to Roblox, using FBX.

The armature contains a root bone, and a child bone which is disconnected. When viewing the animation in Roblox the disconnected bone becomes re-attached to the root bone for some reason.

This does not happen when the FBX is viewed in other software (Windows 3D viewer, F3d, various online viewers).

See this video for an example of the problem: https://i.imgur.com/QCxztKF.mp4

Is there a way to avoid the bone being connected by Roblox?

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#2

If anyone can link to tips for using FBX I’d appreciate it.

So far the caveats I’ve found are:

  • don’t animate the root bone
  • all bones must have something weighted to them, or they get ignored
  • armatures using quaternions are more reliable than eulers
  • include a keyframe for scale at the default value somewhere

The lack of support for disconnected bones suggests that it’s not possible to use armatures to move an object in the way I want, shown in the video.

Can anyone suggest a workaround?