Armature with Spline IK Constraint animation problem I've created a track with skeletal animation. I have a bone, that has Spline IK constraint, which target is bezier curve. This bezier curve has curve modifier, which target is also bezier. All I need is export animation of this track working into fbx for UE4, but after inserting keyframes, nothing happens. I also notices, that locaton and translation of bones changes only visualy after I move the Spline IK's bezier curve. I' ve tried many of variations, but nothing helps. 

And this is what I have in UE. 
It has a gap and it is something like skewed. It is the best I have achieve
If the track is made from pieces parented to bones:


Select all track pieces
Object > Animation > Bake Action
Check all the boxes and hit OK
Now the animation is baked and should export without problems.


If the track is single piece deformed by Armature modifier:


You will have to bake the animation of bones (same as above but bake to Pose)
Or convert it into Shapekey animation with this script. This will also export fine.