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PostPosted: Tue Jan 08, 2019 4:07 am 

Joined: Wed Dec 19, 2018 2:23 am
Posts: 6
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?


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PostPosted: Wed Jan 09, 2019 11:06 pm 

Joined: Wed Jan 24, 2018 7:40 pm
Posts: 9
Location: Texas
What are you trying to convey here? I am a bit lost with your thoughts.


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PostPosted: Thu Jan 10, 2019 2:56 am 

Joined: Wed Dec 19, 2018 2:23 am
Posts: 6
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


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PostPosted: Thu Jan 10, 2019 5:44 am 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2077
Location: Moscow, Russia
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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