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The Summary

I imported this Blender animation to UE4 and the the skeletal mesh is all twisted up. It is just a pistol reload animation that I have been working on. The mesh is comprised of multiple parts that are joined together. At least, I believe so. The armature consists of the trigger bone, the slide bone, the barrel bone, the magazine bone, and finally, the frame bone, which is the root. I made a parent to the hand so that the mesh would move with the hand, rather than having to select all of the bones in order to move the model. I exported the model while the mesh is parented to the right hand. The animation looks fine in Blender but in Unreal Engine 4 the mesh's movement and and the mesh itself is twisted and contorted. I have all of the mesh parts joined together. It might have to do something with the bones, not the mesh parts themselves. I assigned each vertex group to a bone and the vertex groups are weight painted.

In Blender, It looks fine. enter image description here

In Unreal Engine, in the animation viewport, the mesh is twisted up.

enter image description here

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The model I was using did not have a frame bone attached I reimported a model with the frame bone attached which is also the root bone. This solved my problem, I guess this is what happens when you import to unreal engine 4 without a root bone attached to the skeleton.

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