[x3d-public] Over next several weeks, I will be ramping up

[John Carlson]

Thanks Michalis, I just reread and saw the NURBS to simpler things.

That will likely help!

So do we have AMF, 3MF, and binary STL output somewheres?    I have a bit
about PLY input converted to X3D source code. It looks like from the first
image, that PLY, AMF and 3MF output are not done according to the wish
list, but there's an effort in blender plugins to support PLY in/out.

I don't see anything related to AMF and 3MF. In our source code. Is it in
X3D-Edit

Vince, you're the Printing and Scanning dude. It seems like you're
indicating such outputs should be from python?   Does that mean Blender
python or OCC or both? I get it that you want to provide python in a web
page.

Can you direct me to any python code related, if not stuff already posted
by me?

It would likely impact more people if we added it as blender plugins! So
the only task for Python and X3D-Edit is to call various Blender programs
after converting to .blend or sourcing from .blend.

I would be interested in a 4D NURBS, if that is possible (see Ray Tracing
Jello?).  Does that fall under RigidBodyPhysics/ParticleSystems?

John

On Tue, Dec 20, 2022 at 10:29 AM Michalis Kamburelis <
michalis.kambi at gmail.com> wrote:

> Ah, I misread your post in haste -- you wrote "Stereo Lithography (STL)
> export converter from X3D JSON to STL". So X3D -> STL, not the other way
> around. My answer was for X3D -> STL, so not that much helpful to you,
> sorry! :)
>
> If you want to see how we do NURBS -> simpler things, it's in
>
> -
> https://github.com/castle-engine/castle-engine/blob/master/src/transform/castlenurbs.pas
> (calculate points and normals on NURBS curve / surface)
>
> -
> https://github.com/castle-engine/castle-engine/blob/master/src/scene/x3d/x3dnodes_standard_nurbs.inc
> (using above, e.g. NurbsPatchSurfaceProxy uses TNurbsSurfaceCalculator to
> generate X3D TIndexedQuadSetNode)
>
> Regards,
> Michalis
>
>
>
>
> wt., 20 gru 2022 o 17:20 John Carlson <yottzumm at gmail.com> napisał(a):
>
>> Sorry for any confusion, I’m trying to convert abstract geometry (in X3D)
>> to triangle or face meshes in ECMAScript and then to STL.  If someone has
>> done this before, how did you choose a mesh for each shape (sphere, cone,
>> cylinder, extrusion, 2D). I already know NURBS is complex, for that, but
>> I’ve not done animated NURBS, which sounds really hard, and perhaps not
>> good looking???  Has anyone animated NURBS?   Jello, anyone?
>>
>> I’m not looking to produce X3D at this point,  going from a low level
>> triangle code to abstract geometry sounds really hard, but perhaps
>> lucrative?   Isn’t this what the scanning group is doing?  Do they use
>> OpenCascade, C++, and Python?
>>
>> I’ll look at your Pascal code now.
>>
>> John
>>
>> On Tue, Dec 20, 2022 at 6:58 AM Michalis Kamburelis <
>> michalis.kambi at gmail.com> wrote:
>>
>>> STL already contains a simple list of triangles. So if by "tesselation"
>>> you mean "ability to produce triangles from more complex shapes", you don't
>>> really need it for STL :)
>>>
>>> Note that CGE, view3dscene and https://castle-engine.io/convert.php can
>>> convert STL -> X3D. The code to handle STL is really simple and you can
>>> likely adjust it for other purposes / libraries / languages :
>>> https://github.com/castle-engine/castle-engine/blob/master/src/scene/load/x3dloadinternalstl.pas
>>> .
>>>
>>> Regards,
>>> Michalis
>>>
>>> wt., 20 gru 2022 o 12:07 John Carlson <yottzumm at gmail.com> napisał(a):
>>>
>>>> [image: image.png]
>>>>
>>>> The Stereo Lithography (STL) export converter from X3D JSON to STL
>>>> looks like low hanging fruit. I just need to find some good tesselation
>>>> code in ECMAScript. I already have a basic framework. Can anyone recommend
>>>> A-Frame, Three.js, Babylon.js, Unity, X3DOM or X_ITE code for doing
>>>> tesselation, or is it built into WebGL?  Meanwhile, I will be working on
>>>> meshes and creating a project, etc.
>>>>
>>>> On Tue, Dec 20, 2022 at 4:45 AM John Carlson <yottzumm at gmail.com>
>>>> wrote:
>>>>
>>>>> Over the next several weeks, I will be ramping up for potential return
>>>>> to work, testing out CTS coping skills (laying on a different side, taking
>>>>> breaks), computer hygiene, sleeping hygiene etc.
>>>>>
>>>>> My wife has given me the thumbs up to return to work remotely.
>>>>>
>>>>> So if there's any X3D tasks, I should be able to pick some of them up,
>>>>> I will look at the wishlist.
>>>>>
>>>>> BTW, has anyone attached Gmail to GPT-3?
>>>>>
>>>>> Everyone have a merry xmas and happy new year.
>>>>>
>>>>> Thanks!
>>>>>
>>>>> John
>>>>>
>>>> _______________________________________________
>>>> x3d-public mailing list
>>>> x3d-public at web3d.org
>>>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>>>>
>>>
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