# Problem motion capture Blender

I’ve a problem with Blender, I have to make a feet and animate it using a .c3d file with the motion capture of the movements.

But when I try to make the armature and assign the marker to the armature and I press the play, it’s like if the joint of the bones is not connected and they move free but they follow the markers and if I connect the joint and the bones not move.

Also I have tried to make an armature with the bones connected with the key E and they didn’t move. So I need to make a joint that let the bones follow the markers with an anatomical movement.

Could someone please tell me how I can find a solution for my problem?

My .blend file can be found here:

• could you provide a .blend file to be able to have a look and help you?
– Tak
Jan 4 '17 at 4:05
• Yes! Could you provide an email adress for sending it to you!! Thanks :D :D Jan 4 '17 at 10:25
• You can upload it through blend-exchange.giantcowfilms.com then send me the link
– Tak
Jan 4 '17 at 10:27
• Ok! Perfect! This is the link :D <img src="http://blend-exchange.giantcowfilms.com/embedImage.png?bid=2461" /> Jan 4 '17 at 10:38
• is the constraints you made in this file are correct? I can't figure out what is the structure of this c3d to be able to create a proper armature, could you explain or show what is the expected result you want?
– Tak
Jan 4 '17 at 11:44

To me you will only need to Bones, one connecting the ankle with the heel and another connecting the heel with the toes.

First you need to construct the armature properly:

• Shift+A add armature, then add a bone
• Select the two markers 01, 04 to position in between, and align 3D cursor with Shift+S then Cursor to Selected, this will position the bone between the two markers.
• Then enter edit-mode of armature and select the bone and Shift+S then Selection to Cursor
• Select the markers 05, and align 3D cursor with Shift+S then Cursor to Selected
• Then enter edit-mode of armature and select the second bone and Shift+S then Selection to Cursor

The second step is adding bone constraints:

• For the first (root) bone use two Copy Location constraint with second on 50% influence to get in between position of two markers 01 and 04. Then add Damped Track to track marker 05
• For the second bone use two Damped Track constraints with second on 50% influence to get in between position of two markers 02 and 03.

Result is shown as below:

The updated .blend file can be found here:

• Maaany thaaanks!!!! :D Jan 4 '17 at 13:29
• @Yaicobr Not a problem, glad I helped :) you can upvote the answer if it was helpful ;)
– Tak
Jan 4 '17 at 13:34