[x3d-public] Linear programming

[John Carlson]

Note: This email does not discuss linear programming.

So X3DJSAIL has some linear algebra support, see:

https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/sai/Matrix4.html

There are also lower dimension/order classes.

As you can see, transpose, identity, multiply and converting from Transform
fields.

Following up from Joe’s message:

Ideally, there would be some way to rotate HAnim joints and recompute joint
centers along with zeroing rotations.  Maybe I haven’t looked deep enough.
The best place to look for this may be a design tool.  I’ve tried to do the
matrix multiplication on my own, but I was dealing with 11GB HAnim files
which slowed me down too much.

On Tue, Feb 13, 2024 at 5:17 PM John Carlson <yottzumm at gmail.com> wrote:

> Others have good suggestions.  I suggest looking at the SFMatrix field
> types for any linear algebra transformations, either in SAI or and SAI
> package.  I haven’t looked, preferring to develop my own, mostly alpha code
> for converting X3D JSON to STL.
>
> I think linear programming is out of scope for X3D. Maybe look at FX3D,
> FVRML or a Wolfram product.
>
> I’m not aware of packages which “reduce complexity” of X3D, but you can
> borrow my JSON to STL and matrix JavaScript, just be aware that it’s not
> fully tested.  Tools like X3DOM and X_ITE might have full matrix libraries,
> because they do rendering, which effectively reduces complexity.  I’m not
> aware that X3DJSAIL or X3DPSAIL have full matrix libraries in order to
> reduce complexity, but there may be STL extensions that I am unaware of.
>
> So it’s really a matter of figuring out what programming language you want
> to use.
>
> Other places to look for matrix transformations include Three.JS and pygfx.
>
> Above all, in X3D, you can’t just “set a position” of a sphere without
> using a transform, so reducing complexity is pretty hopeless unless you
> convert to triangles.
>
> John
>
> On Tue, Feb 13, 2024 at 11:48 AM Konstantin Smirnov via x3d-public <
> x3d-public at web3d.org> wrote:
>
>> Thanks a lot
>> I wanted to use some engine that solves linear programming connected with
>> equations and scenes.
>> Then reduces the complexity.
>> At last I found some articles. They use matrix transformations. Also I
>> use interval math engine.
>> Good to see some new X3D versions at work.
>>
>> вт, 13 февр. 2024 г. в 20:06, Brutzman, Donald (Don) (CIV) <
>> brutzman at nps.edu>:
>>
>>> Hi Konstantin, thanks for your question.
>>>
>>>
>>>
>>> May I suggest that offline creation or modification of X3D scenes is a
>>> good way to proceed when the problem space is unconstrained.
>>>
>>>
>>>
>>> The following two libraries are reasonably mature and can be used with
>>> other programs for generating X3D models.  They are designed to exactly
>>> match the X3D Architecture with strongly typed node and field
>>> relationships.  Strong typing for careful construction means that it is
>>> relatively hard to produce an invalid model.  Careful authoring with useful
>>> values remains a critical skill, of course.
>>>
>>>
>>>
>>>    - X3D Java Scene Access Interface Library (X3DJSAIL)
>>>    - X3D Java Scene Access Interface Library (X3DJSAIL) supports
>>>    programmers with standards-based X3D Java interfaces and objects, all as
>>>    open source.
>>>    - https://www.web3d.org/specifications/java/X3DJSAIL.html
>>>
>>>
>>>
>>>    - X3D Python Scene Access Interface Library (X3DPSAIL)
>>>    - The x3d.py Python X3D Package supports programmers with Python
>>>    interfaces and objects for standards-based X3D programming, all as open
>>>    source.
>>>    - https://www.web3d.org/x3d/stylesheets/python/python.html
>>>    - https://pypi.org/project/x3d
>>>
>>>
>>>
>>> If further refinements are desired at run time, then the first step is
>>> still to figure out what the basic scene structure might be.  Adding a
>>> Script node with ECMAScript source can then produce further modifications
>>> to the designed scene at run time, perhaps in response to user interaction.
>>>
>>>
>>>
>>> Good luck with your work.
>>>
>>>
>>>
>>> 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 *Konstantin
>>> Smirnov via x3d-public
>>> *Sent:* Tuesday, February 6, 2024 10:09 AM
>>> *To:* X3D-Public <x3d-public at web3d.org>
>>> *Cc:* Konstantin Smirnov <konstantin.e.smirnov at gmail.com>
>>> *Subject:* [x3d-public] Linear programming
>>>
>>>
>>>
>>> If I want to include linear programming equations for scene optimizing,
>>> computing, how their complexity can be reduced?
>>>
>>> Automated integrated script for solving linear programming combined with
>>> scene plotting
>>>
>> _______________________________________________
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>>
>
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