[x3d-public] Explorations of Mocap formats. BVH conversions to X3D with X3D-Edit

[GPU Group]

Looks interesting. A few months ago I sniffed around a bit on that cmu site
and found .bvh, although it was hard to find.
http://mocap.cs.cmu.edu/resources.php
- a few BVH links on this page, to:
https://sites.google.com/a/cgspeed.com/cgspeed/motion-capture

<https://sites.google.com/a/cgspeed.com/cgspeed/motion-capture>Here's more
from web searching:
https://github.com/BandaiNamcoResearchInc/Bandai-Namco-Research-Motiondataset/tree/master

- collection of bvh animations, several styles of walking, and
walking-turning, arm raising
- free for research and personal use
- I'm using a few of these for testing, and bvhacker reads them and edits
and trims them
(bvhacker editing issue: not sure how to change the x y z rx ry rz on just
one one frame, seems to apply to all frames;
Could/should the trim controls for the slidebar could be changed so set the
slidebar and hit button StartTrim move to end of editing and hit EndTrim,
and then when editing only edit frames between startTrim and endTrim?)
- Y-Up

https://centralsource.com/blender/bvh/files.htm
- from blender
- blender can import Y-UP bvh, but > Motion Capture .bvh only exports Z-Up.
I had trouble converting to Y-Up.
Hypothesis: if you import Y-UP and export Z-UP 3 times, you'll be back to
Y-UP.
- would be nice if someone modified the io_anim_bvh/export_bvh.py to
optionally export Y-UP

-Doug



On Sun, Sep 3, 2023 at 3:14 PM John Carlson <yottzumm at gmail.com> wrote:

> CMU's Mocap File Database:
>
> Carnegie Mellon University - CMU Graphics Lab - motion capture library
> <http://mocap.cs.cmu.edu/>
>
> Files are in amc, c3d and tvd, so you have to convert.
>
> I'll try this:
>
> thcopeland/amc2bvh: Convert ASF/AMC motion capture files to BVH motion
> capture files. (github.com) <https://github.com/thcopeland/amc2bvh>
>
> Git for Windows doesn't have make, trying cygwin.
>
> installed gcc-core
>
> ran make.  warnings,but there's an executable:
>
> $ ./amc2bvh 56.asf 56_03.amc -o 56_03.amc.bvh
> $ ./amc2bvh 56.asf 56_06.amc -o 56_06.amc.bvh
> $ ./amc2bvh 56.asf 56_07.amc -o 56_07.amc.bvh
>
> So far so good.  Now to try X3D-Edit.
>
> BVH import is worked, files are translated.
>
> Now to validate!
>
> QA Log:
>
> Performing DTD validation...
> Checking file:/C:/Users/john/amc2bvh/56_03.amc.x3d...
> Attribute value "Bvh56_03.amc_hip" of type ID must be unique within the
> document.
> Attribute value "Bvh56_03.amc_thigh" of type ID must be unique within the
> document.
> Attribute value "Bvh56_03.amc_wrist" of type ID must be unique within the
> document.
> Attribute value "Bvh56_03.amc_hand" of type ID must be unique within the
> document.
> XML DTD validation: fail!
>
> Performing X3D schema validation...
> Checking file:/C:/Users/john/amc2bvh/56_03.amc.x3d...
> Attribute value "Bvh56_03.amc_hip" of type ID must be unique within the
> document.
> Attribute value "Bvh56_03.amc_thigh" of type ID must be unique within the
> document.
> Attribute value "Bvh56_03.amc_wrist" of type ID must be unique within the
> document.
> Attribute value "Bvh56_03.amc_hand" of type ID must be unique within the
> document.
> XML schema validation: fail!
>
> Other than that, good!  Now to try to view (not inside X3D-Edit)
>
> Sending Zip under another cover for investigation of why BVH
> import creates duplicate IDs.
>
>
> Looks good though!
> [image: image.png]
>
>
>
>
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