[x3d-public] got Three.js and X3D?
Brutzman, Donald (Don) (CIV)
brutzman at nps.edu
Mon Feb 20 22:39:28 PST 2023
Thanks John, your suggestions pretty closely match mine. Workflow seems
external to X3D4 pathways, typically performed offline. It seems sensible
to avoid intermediate-format conversions if possible, since that offers more
potential for "lost in translation" conversion problems.
Please note that X3D4 specification only supports glTF loading and
rendering, not .obj files. Specification excerpts follow:
* X3D4 Architecture, Networking component, 9.4.2 Inline
*
https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/
components/networking.html#Inline
* The run-time system can support any number of 3D model resource
types as long as those follow the abstract model definition (see
2.[RFC2077]), provide a registered content type ( e.g., model/x3d-xml,
model/gltf-bin, model/stl, etc.), and can be determined with some form of
content negotiation (see 2.[RFC2616]). The run-time system must support at
least one X3D type ( e.g., model/x3d-xml) but can also support and negotiate
any number of X3D encodings and (optionally) non-X3D representation formats.
Support for loading glTF assets (see 2.[GLTF]) also requires support for
Shape component level 2 and Lighting component level 4.
* X3D4 Architecture, Networking component, Table 9.3 - Networking
component support levels
*
https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/
components/networking.html#t-supportLevels
* Level 4, prerequisites Core 1 and Grouping 1, Nodes/Features and
Support:
Model support
Support for glTF models in Inline nodes, in .gltf (model/gltf+json) and .glb
(model/gltf-binary) formats.
Requires support for Shape component level 2 and Lighting component level 3.
Minimum required glTF support:
* transformation hierarchy,
* meshes,
* physical materials,
* loading of external binary data referenced from .gltf files ( e.g.,
for vertex coordinates).
* X3D4 Architecture, Clause 2 Normative references
*
https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/
references.html#GLTF
* GL Transmission Format (glTF) Specification, The Khronos Group,
Version 2.0, 2021.
* https://github.com/KhronosGroup/glTF/tree/master/specification/2.0
Careful scrutiny of the prose above should reveal that we do not forbid
browser support for other formats. A premier example browser which not only
loads and displays numerous formats but typically can also save back out as
X3D or VRML:
* Castle Game Engine, view3dscene 4.2.0
* view3dscene is a viewer for many 3D model formats: glTF, X3D, VRML,
Collada, 3DS, MD3, Wavefront OBJ, STL and (2D) Spine JSON and sprite sheets
(in CGE, Cocos2d, Starling XML formats).
* 4.2. Converting to X3D
* https://castle-engine.io/view3dscene.php#section_converting
Our master list of conversion and import/export tools follow. Additions and
updates always welcome, anything else out there that anyone wants to
recommend?
* X3D Resources: Conversions and Translation Tools
*
https://www.web3d.org/x3d/content/examples/X3dResources.html#Conversions
* X3D Resources: Export and Import by Applications
* https://www.web3d.org/x3d/content/examples/X3dResources.html#Export
Have fun with Castle Game Engine view3dscene! 8)
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: John Carlson <yottzumm at gmail.com>
Sent: Monday, February 20, 2023 6:01 PM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
Cc: X3D Public Mailing List (x3d-public at web3d.org) <x3d-public at web3d.org>
Subject: Re: [x3d-public] got Three.js and X3D?
My tendency would be to go from X3D to glTF or COLLADA to glTF and then load
glTF into three.js. Also x3d to OBJ looks like a thing with aopt.
I believe both OBJ and glTF are supported by X3d4.
OBJ is native to three.js
If you find a tessellation library in all of this, that would good to know.
John
On Mon, Feb 20, 2023 at 5:47 PM Brutzman, Donald (Don) (CIV)
<brutzman at nps.edu <mailto:brutzman at nps.edu> > wrote:
Three.js is an independently developed Javascript library. Wondering about
relationship (if any) for X3D use. Some X3D folks have used it in the past
but am not seeing any common ground at
* https://threejs.org/docs/#manual/en/introduction/Loading-3D-models
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fthreejs.o
rg%2Fdocs%2F%23manual%2Fen%2Fintroduction%2FLoading-3D-models&data=05%7C01%7
Cbrutzman%40nps.edu%7C81a7bda9219a40c17d3108db13af7543%7C6d936231a51740ea919
9f7578963378e%7C0%7C0%7C638125416555828348%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiM
C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sd
ata=Mka63OvSlaulJZnB%2BXUZsDq51AB%2BIdgXIUOqvRJDbpM%3D&reserved=0>
Searching a little more, found some older posts:
* https://github.com/dividab/three-x3d-loader
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.co
m%2Fdividab%2Fthree-x3d-loader&data=05%7C01%7Cbrutzman%40nps.edu%7C81a7bda92
19a40c17d3108db13af7543%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C6381254
16555828348%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJB
TiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=8NTGzV3KouU72GIkYSnPzG%2FwL
NabVN21np1ZBcKiA%2Fk%3D&reserved=0>
*
https://stackoverflow.com/questions/20810737/importing-x3d-files-into-three-
js
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstackover
flow.com%2Fquestions%2F20810737%2Fimporting-x3d-files-into-three-js&data=05%
7C01%7Cbrutzman%40nps.edu%7C81a7bda9219a40c17d3108db13af7543%7C6d936231a5174
0ea9199f7578963378e%7C0%7C0%7C638125416555828348%7CUnknown%7CTWFpbGZsb3d8eyJ
WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C
%7C&sdata=aLRG4vceNU9S867SdbkZ8y5dJ1oQ2tVn5B3kczmofPI%3D&reserved=0>
Apparent overlap: capability for loading glTF models.
Just curious, thanks for all opinions. If there is something worth
including on X3D Resources, will add it.
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman at nps.edu
<mailto: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 <http://faculty.nps.edu/brutzman>
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