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Multiple roots are found in the bone hierarchy we only support single root bone blender

Hi, i have a question, i did an animation from blender and when i export the fbx document and try to import this with UE4 this error apears :s help me please, "how can i change the multiple bone to single root bone"?

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asked Oct 07 '14 at 07:59 AM in Using UE4

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3 answers: sort voted first

First, unparent your mesh to the skeleton (or this may cause crashing later when importing) alt+p, clear parent. Now, go and create a root bone if you do not already have one you want to use as root. Join all your bones together into one armature by selecting them all in object mode and pressing ctrl+j. Select the armature and go to (usually tab)edit mode, select all the bones that you ARE NOT your root bone, then finally select the root bone and press ctrl+p (make parent), and select keep offset, (assuming you dont want to move your other bones onto the root bone).

Export the armature as fbx as you where and it should work now.

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answered Oct 08 '14 at 12:07 AM

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avatar image TacoLevelDesign Jul 31 '15 at 12:29 AM

I had the exact same problem. I made a skeleton mesh in blender with armature. When I exported and imported to UE4, I got a multiple root error. I went back in blender and noticed that my IK and pole targets were not under the Root hierarchy. I selected the IK and pole targets, then selected the root bone, Ctrl-p offset. This made the root bone the parent of IK and Pole-targets. Then I went and unchecked inherit location, rotation, transformation, and connected on IKs and Pole Targets, so it didn't mess everything up. Re-exported to UE4 and works just fine.

I did all this in edit mode and didn't have to clear parents or join anything. When you make the IK and pole targets, you have to clear the parents on them to work correctly, but after that you have to re-parent them to the root as I stated above, or UE4 will think its another Root Bone.

Thanks for your help, Neurocase, you got me on the right track. :)

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I have the some error 10 minets ago:D see exapmle: Firlsty i have error, i have this bone structure: ![alt text][1] [1]: /storage/temp/36830-root1.png To fixed it i chane it like that(with some method create bone and root all to it(ctrl p -> keep offset/alt p to clear), also you can just add parent to "Hips" on my exapmle and 4 another bones to root bone, and all) ![alt text][1] [1]: /storage/temp/36841-root.png

If also dont understand see this posts https://forums.unrealengine.com/showthread.php?59548-Blender-import-error-multiple-root-bones

And also i create tutorial https://youtu.be/Pq7rOXc6ZQs )

root1.png (33.7 kB)
root.png (35.6 kB)
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answered Apr 01 '15 at 10:30 AM

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This is a solution that worked for me.alt text

First collapse every parent until it looks like this alt text

Then create a new bone, call it ROOT and put it anywhere in model space (I put mine right above the character head but it doesnt matter) then select every parent bone (Torso, Leg Control R, etc) selecting the ROOT bone last and ctrl+p in edit mode and select keep offset

alt text

SOLVED: It should now look something like this. Notice the root and everything under it. Export as FBX and there should be no problems, at least in my case.

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answered Dec 20 '18 at 07:50 AM

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