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

[John Carlson]

In particular, I'm looking for a skipping motion animation, if you're
poking around..I found three on CMU, here: Carnegie Mellon University - CMU
Graphics Lab - motion capture library <http://mocap.cs.cmu.edu/>, but
they're part of a collection, and I'll have to figure out how to separate
the BVH, AMC or X3D.

Thanks!

John

On Sun, Sep 3, 2023 at 5:23 PM GPU Group <gpugroup at gmail.com> wrote:

> 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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