[x3d-public] BVHacker, HAnim transformation, TypeScript SAI?

Sat Aug 26 20:46:56 PDT 2023

John, it is great that you explore and do a lot of things, thank you.

Unfortunately your next message seems very puzzling to me.  Rather than
respond, let me point out some fundamental building blocks please.

a.	We have X3D 4.0 with interpolators, event passing, HAnim inclusion,
many other things.
b.	HAnim animation includes interpolator approaches (well tested) and
BVH-style HAnimMotion (only a few tests, BVHacker might be useful).
c.	We have X3D equivalently expressible in XML, ClassicVRML, binary,
Java and Python.
d.	We do not yet have, and certainly could use, a validating X3D JSON
schema and an SAI-compliant X3D ECMAScript library.

Repeating:

*	Can your work get us (d) above?
*	X3D group is not doing Microsoft TypeScript or other new languages
while upgrading standards documents, libraries and test-archive examples
thoroughly to each of our approved paths.

Focusing is good, and X3D group will stay focused on an already-large
agenda.

Again thanks and good luck with your efforts.

all the best, Don

-- 

Don Brutzman  Naval Postgraduate School, Code USW/Br        brutzman at nps.edu

Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA    +1.831.656.2149

X3D graphics, virtual worlds, navy robotics https://faculty.nps.edu/brutzman

From: x3d-public <x3d-public-bounces at web3d.org> On Behalf Of John Carlson
Sent: Saturday, August 26, 2023 2:10 AM
To: X3D Graphics public mailing list <x3d-public at web3d.org>; Holger Seelig
<holger.seelig at yahoo.de>
Subject: [x3d-public] BVHacker, HAnim transformation, TypeScript SAI?

I would like to create a way to "render" HAnim animations/transformations to
one or more X3D encodings, in particular, I would like to do this in a
headless manner (no screen involved). In particular, I would like to solve
the problem of moving the humanoid between different poses and saving them
off. I realize that many animation tools probably already do this. I know
that SFMatrix and MFMatrix SAI can do matrix multiplication (no
quaternions??) and that may be important.  But more important is making
skins and skeletons from different systems to work together. Doug
recommended BVHacker, bvhacker - home
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbvhacker.
com%2F&data=05%7C01%7Cbrutzman%40nps.edu%7Cd9e0f5e5d4b44ca8974808dba61455d6%
7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638286378509592461%7CUnknown%7C
TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%
3D%7C3000%7C%7C%7C&sdata=MjsHxXkfxI46FBjrUx67TH4NTs5PGfX50FrAftbEYy0%3D&rese
rved=0> .

I would use X3DOM or X_ITE if I could separate the rendering, X_ITE has
Browser.toJSONString(), which I may experiment a bit with, and I want to
address the skin and the skeleton separately, like rotating the skin 180
degrees, but not the skeleton.  Something like x3d-tidy or tovrmlx3d might
be used to "animate" the humanoid.  That's up to those authors.

So I think a bit about using XSLT and creating a TypeScript SAI.  I would
likely modify the X3DJSAIL XSLT that takes the X3DUOM and produces X3DJSAIL,
Python doesn't have a way to import any encoding that I know of (no
createX3D...). X3DJSAIL has X3DLoaderDOM.java, which will allow me to import
JSON as DOM which lets me use X3DJSONLD (I hope this works, otherwise I'll
be riding the XML bandwagon!). C/C++/C# SAI looks like an empty shell (I
realize there may be some DLLs).

I choose not to modify the X3DJSAIL codebase beyond the stylesheet.  I'm not
going there.  But my changes might be backported to Java.  I will attempt to
use the SaxonJS product, if it is good enough, to be able to use
x3dTo...xslt in the program. X3DJSAIL offers everything that I know I need
except for applying transforms to centers.

I chose TypeScript over JavaScript/ECMAScript because I feel the former is
closer to Java than the latter two.

No, I'm not going to read the SAI standard. I have to learn TypeScript.

If anyone knows a way to easily design XSLT (Something like XSLbyDemo), let
me know...XMLSpy?

John

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