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How ipiMocap studio creates a bvh file?
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Author:  NicoDownBeat [ Tue Jan 08, 2019 4:07 am ]
Post subject:  How ipiMocap studio creates a bvh file?

How ipiMocap studio creates a bvh file?
I'll explain: If you consider a "one-frame animation" with the Tpose in which only the hip is rotated for example:
Rx 30, Ry60, Rz 45 (degrees)
and you'll export into bvh file, you'll obtain this rotation (approximately)
Rx:-9.5 , Ry:-0.000002, Rz:20.6 (degrees)
(You can find those angles if you open the bvh file with a simply text editor).
What angles are those? Are Euler angles? or Axis angles?

Author:  margarettteS [ Wed Jan 09, 2019 11:06 pm ]
Post subject:  Re: How ipiMocap studio creates a bvh file?

What are you trying to convey here? I am a bit lost with your thoughts.

Author:  NicoDownBeat [ Thu Jan 10, 2019 2:56 am ]
Post subject:  Re: How ipiMocap studio creates a bvh file?

LOL!
Exactly what I wrote.

In ipi Mocap Studio ,consider a simply Tpose. Now select only the Hip and rotate it by a x, y, z angles. You can read these angles on the right of your screen into the poseTab. Write them down.
Now export only that frame from ipi Mocap Studio into a bvh file.
Open that bvh file with notepad.
Scroll down, under the "motion" part. You'll find the the x y z translation of the hip and then the x y z rotations of all the bones.
Obviously all rotations are 0.00000 except the hip's rotations. Those rotations' value are different from rotations value above.
Why?

Thank you

Author:  vmaslov [ Thu Jan 10, 2019 5:44 am ]
Post subject:  Re: How ipiMocap studio creates a bvh file?

Historically, different order of Euler angles is used for display on the Pose tab (XYZ) and for export to BVH (ZYX). Hence the difference in values. Our Biomech add-on is better suited for data analysis and allows to export Euler angles with various orders.

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