[x3d-public] Seed for a project

Sun Aug 13 06:23:00 PDT 2023

I am thinking SAI could be a good way to do this.

On Sun, Aug 13, 2023 at 8:14 AM John Carlson <yottzumm at gmail.com> wrote:

> Good question about BVH!  I am proposing a new mocap format that doesn’t
> need a hierarchy, and can do streaming, graph or grid data.
>
> S:structure of data, G for grid, H for tree, D for D for DAG, C for cycles
> V: name or id of structure
> F: from joint name and/or id
> T:to joint name and/or id
> O: out name
> B:out data (beginning)
> I: in name
> E:in data  (ending)
> .
> .
> .
> etc.
>
> The animation is done like:
> J:Joint id or name
> C:Joint class or type (may change)
> A:Joint alias or DEF (optional)
> X:X location, unit (unit may be defaulted, no unit for scaling)
> Y:Y location, unit (ditto)
> Z:Z location, unit (ditto)
> T:frame or time, unit (ditto)
> .
> .
> .
> etc.
>
> -V: remove structure
>  -J: remove joint
> -F: from joint name and/or id
> -T: to joint name and/or id
>
> To remove joint, bones or routes.
>
> Later, I will provide 4 data points per joint over time, for impact
> simulator I/O grid
>
> J: Joint, as above
> U:up data
> D:down data
> R:right data
> L:left data
>
> Plus ways to remove data by adding a - in front or behind the label and a
> leading or a trailing + to add data
>
> This needs to be generalized. Think how to do hypergraphs. More verbose
> would be an option,  IDK, i don’t want to reinvent a document format.
>
> Obviously inspired by Katy’s format!
>
> Contributions welcome.
>
> John
>
>
>
> On Sun, Aug 13, 2023 at 6:24 AM Joe D Williams <joedwil at earthlink.net>
> wrote:
>
>> Why concern about BVH?
>>
>>
>>
>> -----Original Message-----
>> From: John Carlson <yottzumm at gmail.com>
>> Sent: Aug 12, 2023 7:48 PM
>> To: GPU Group <gpugroup at gmail.com>
>> Cc: X3D Graphics public mailing list <x3d-public at web3d.org>
>> Subject: Re: [x3d-public] Seed for a project
>>
>>
>> I guess the best way to do the translations and rotations in BVH is from
>> the root to the extremities?  Get segments close to root, then work down
>> the tree.
>>
>> What about multiple parents in the DAG?  How is this resolved?  As
>> separate children?
>>
>> I’m pretty sure BVH is a tree?  Anyone know?
>>
>> John
>>
>> On Sat, Aug 12, 2023 at 12:00 PM GPU Group <gpugroup at gmail.com> wrote:
>>
>>> > 1) provide a way to convert X3D nodes and ROUTEs to BVH with
>>> animation.  This will require converting routes/segments over time to
>>> translations and rotations. Help is requested.
>>> One fuzzy idea: use the nodes and routes to animate, and capture the
>>> animation at a choke point in the web3d browser. A good choke point is
>>> where the browser applies BVH animations to the HAnim. In freewrl there are
>>> a few spots where it calls update_jointMatrixFromMotion() and in theory
>>> there could be another call there update_MotionFromJointMatrix() which goes
>>> the other way, converting a joint matrix into a bvh motion for recording to
>>> a file, with frame timestamp.
>>>
>>>
>>>
>>> On Sat, Aug 12, 2023 at 10:14 AM John Carlson <yottzumm at gmail.com>
>>> wrote:
>>>
>>>
>>>> Here's the seed for a Java (possibly X3D-Edit) project. A graph/grid
>>>> editor.
>>>>
>>>> https://github.com/coderextreme/impact.dir/tree/master/impactVL
>>>>
>>>> I was thinking of adding:
>>>>
>>>>  JSON/XML/VRML/BVH/MediaPipeHolistic/JavaSerialized/OpenUSD  I/O,
>>>> beyond native.
>>>>
>>>> There seems to be a slight issue with input right now, at least with
>>>> the sort* input files in Impact.java
>>>>
>>>> Make a copy of a file externally before modifying in the tool, there's
>>>> no way to save to another file currently in Impact.java.
>>>>
>>>> The goals are:
>>>>
>>>> 1) provide a way to convert X3D nodes and ROUTEs to BVH with
>>>> animation.  This will require converting routes/segments over time to
>>>> translations and rotations. Help is requested.
>>>>
>>>> 2) provide a way to visualize ROUTEs with Java (anyone else have
>>>> something?)
>>>>
>>>> 3)  provide different naming convention for different I/O
>>>>
>>>> 4) take input from MediaPipe Holistic (Python) and convert to BVH.
>>>>
>>>> 5) provide a way to debug X3D events in Java.
>>>>
>>>> There are already 2 different visualizations. I hope to add more.  One
>>>> (Cell4x4) is based on Jed Donnelly's graphics (see images folder) scanned
>>>> from his Impact project (hence the name). I would like to use this with
>>>> permission, but I haven't heard from him.  The Java is mine, based on his
>>>> original idea (not his or other's code).
>>>>
>>>> Note that I haven't tested the Cell.java program much recently.
>>>> Impact.java is what Jed called the "Flow" or "Floweth" language, but his
>>>> idea was to create a textual language.  But a challenge is making the 2
>>>> visualizations to work together.  The textual language will be implemented
>>>> in X3D/BVH. I don't have a reason to create a new language, nor do I want
>>>> to.
>>>>
>>>> Note that I already have the idea for "Inlines" or expanding nodes into
>>>> another window.  I'm not sure how well it's implemented.  I'm not sure
>>>> about I/O of nested nodes right now.
>>>>
>>>> This seems like a lot of fun, and maybe even useful, as opposed to X3D
>>>> JSON.
>>>>
>>>> Ant and Makefiles provided.  Not gradle. Too many garbage files to
>>>> worry about iwith gradle--I'm not sure why they have all of them. If
>>>> someone wants to provide maven or gradle, that would be cool. Ant is okay
>>>> in Git for Windows.  If I have to fall back to Makefiles, I can use Cygwin.
>>>>
>>>> Any problems, file an issue with
>>>> https://github.com/coderextreme/impact.dir/issues.  There's one
>>>> waiting for you to close, Jed.
>>>>
>>>> John
>>>>
>>>>
>>>>
>>> _______________________________________________
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>>>
>>>
>>
>
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