[x3d-public] X3D minutes 3 MAR 2022: announcements, SpotLight default values, NurbsSweptSurface NurbsSwungSurface found in FreeWrl, planning X3DOM WebXR

Wed Apr 13 12:00:57 PDT 2022

NURBS SWEPT & SWUNG
http://dug9.users.sourceforge.net/web3d/tests/NURBS/specs
http://dug9.users.sourceforge.net/web3d/tests/NURBS/specs/swept2_translate.png
http://dug9.users.sourceforge.net/web3d/tests/NURBS/specs/swept2_full.png
http://dug9.users.sourceforge.net/web3d/tests/NURBS/specs/swung2.png
Swept translate - like Piegl & Tiller, x-section is kept facing same
direction, so extruded volume collapses when trajectory goes orthogonal to
face normal
Swept full - Doug modification to maintain extruded volume by rotating
profile to stay orthogonal to trajectory curve.
http://dug9.users.sourceforge.net/web3d/tests/NURBS/specs/nurbsswept.x3d
http://dug9.users.sourceforge.net/web3d/tests/NURBS/specs/nurbsswung.x3d

Online search for diagrams from The NURBs Book, Piegl & Tiller

https://www.semanticscholar.org/paper/The-NURBS-Book-Piegl-Tiller/dfb4e8bc558d52bc1b806aea33a178f964bdf0b2/figure/39

- Figure 10.11 Translational sweeping a) Trajectory and sectional curves

https://www.semanticscholar.org/paper/The-NURBS-Book-Piegl-Tiller/dfb4e8bc558d52bc1b806aea33a178f964bdf0b2/figure/40

- (Figure 10.11 continued) b) swept surface

https://www.semanticscholar.org/paper/The-NURBS-Book-Piegl-Tiller/dfb4e8bc558d52bc1b806aea33a178f964bdf0b2/figure/37

- Figure 10.1 profile and trajectory curves for swung surface

https://www.semanticscholar.org/paper/The-NURBS-Book-Piegl-Tiller/dfb4e8bc558d52bc1b806aea33a178f964bdf0b2/figure/52

- 10.2 swung surface a) Control net;

https://www.semanticscholar.org/paper/The-NURBS-Book-Piegl-Tiller/dfb4e8bc558d52bc1b806aea33a178f964bdf0b2/figure/53

- (10.2 swung surface continued) b) no weights c) weights applied

On Fri, Mar 4, 2022 at 10:19 AM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> Attendees: Anita Havele, Michalis Kamburelis, Vince Marchetti, Nicholas
> Polys, Dick Puk, Doug Sanden, Don Brutzman.
>
>
>
> Wow, another super-productive meeting.  Thanks to everyone for an intense
> 70-minute session.  Details follow.
>
>
>
> *From:* Brutzman, Donald (Don) (CIV)
> *Sent:* Thursday, March 3, 2022 11:04 PM
> *To:* X3D Public Mailing List (x3d-public at web3d.org) <x3d-public at web3d.org
> >
> *Cc:* brutzman at nps.edu
> *Subject:* X3D agenda 3 MAR 2022: announcements, Mantis issues,
> NurbsSweptSurface NurbsSwungSurface, planning
>
>
>
> 1.       Regular Friday meeting Friday 08-0900 pacific, call information
> follows.  All inputs and participation welcome.
>
>
>
> Videoconference Connectivity:
>
>    -
>    https://us02web.zoom.us/j/81634670698?pwd=a1VPeU5tN01rc21Oa3hScUlHK0Rxdz09
>    - https://zoom.us/j/148206572  Password 483805
>    - https://www.web3d.org/member/teleconference-information
>
>
>
> 2.       A lot of great things are happening!  Announcements welcome.   8)
>
>
>
>    - https://www.web3d.org/x3d4
>    - https://www.web3d.org/x3dv4-highlights
>
>
>
> We discussed plans for a webinar by Michalis on Physically Based Rendering
> (PBR) in X3D, including X3D interoperability with glTF.
>
>
>
> Steady progress has continued on x3d.py with improved duck-typing
> flexibility.  Problems remain however with the PyPi installation of x3d.py
> not working properly, troubleshooting continues.
>
>
>
> NPS has access to an interest point scan that might be of interest for
> further projects.  More details to follow next week.  Preliminary
> visualization available at
>
>
>
>    - Digital 3D Scan of Sea Land Air Military Robotics (SLAMR) Lab, NPS
>    -
>    https://gitlab.nps.edu/Savage/Spiders3dPublic/-/tree/master/videos/demonstrations/SLAMR
>
>
>
> 3.       We have a few pending Mantis issues (e.g. Spotlight default
> values) that maybe can be resolved.
>
>
>
>    - https://www.web3d.org/member-only/mantis/view_all_bug_page.php
>
>
>
>    - X3D4 Architecture
>    -
>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/Architecture.html
>
>
>
> We took yet-another tour through new examples, view3dscene showed great
> precision.  Thank you Michalis for compelling and useful screenshots.
>
>
>
> The working group achieved consensus on Spotlight default values, final
> decision:
>
> beamWidth = pi * 3 / 16
>
> cutOffAngle = pi / 4
>
>
>
> Dick and Don will propagate this change through specification,
> schema/DTD/X3DUOM, X3D tooltips, autogenerated Java/Python/Turtle
> implementations, converters and Mantis issue tracker.
>
>
>
> Hooray!   8)
>
>
>
> 4.       Problem:  I’m not sure that NurbsSweptSurface and
> NurbsSwungSurface are well defined.
>
>
>
>    - X3D4 Architecture, 27 Nurbs Component, 27.4.11 NurbsSweptSurface
>    -
>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/nurbs.html#NurbsSweptSurface
>
>
>
>    - X3D4 Architecture, 27 Nurbs Component, 27.4.11 NurbsSwungSurface
>    -
>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/nurbs.html#NurbsSwungSurface
>
>
>
>    1. Got better figures?  No actual NURBS appear to be in the figures,
>    just spines…
>    2. Got examples?
>    3. First-pass discussion: what needs to be done to improve these?
>
>
>
> Great news:  Doug Sanden showed us an example of NurbsSweptSurface and
> NurbsSwungSurface in FreeWrl.  He will share models, screenshots
>
>
>
> 5.       Planning our next meetings
>
>
>
>    1. 11 MAR 2022, achieving WebXR support for X3DOM
>
>
>    - https://www.x3dom.org
>
>
>
> X3DOM has supported WebVR in the past.  Some people are apparently working
> on adding WebXR support to X3DOM… There are some resources available, like
> a migration guide.
>
>
> https://github.com/immersive-web/webxr/blob/master/webvr-migration.md
>
>
>
> Given their importance, we are talking a look at how such efforts might
> proceed for achieving best shared results.  We will also zoom back and
> discuss overall plans for how X3DOM evolution will continue adoption of
> X3D4 features.
>
>
> Michalis asks: Binary buffers in X3D, following glTF -- already in X3DOM,
> plans to introduce it to X3D spec? Because we should at some point :)
>
>    - Binary compression is a long-standing activity in X3D, Fraunhoffer
>    work led to refinement of those capabilities?
>    - Should we add such buffers in X3D4.1, and perhaps encourage
>    implementation/evaluation in the near term as a Web3D Recommended Practice?
>
>
>
> Dick asks: It would be interesting to see an updated list of X3DOM support
> levels for each of the X3D4 components.
>
>
>
> Nicholas notes: I really liked their image based compression (POP buffers)…
>
>
>
> We will also look at MAR Working Group to see if reviving is desirable and
> possible.
>
> https://www.web3d.org/working-groups/mixed-augmented-reality-mar
>
>
>
>    1. 18 MAR 2022, do we have complete implementations of X3D Geospatial
>    Component in X3D4 and public implementations?
>
>
>
>    -
>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/geospatial.html
>
>
>
> I’ll have list of open geospatial issues ready.
>
>
>
> We will determine next steps for our collaboration with Open Geospatial
> Consortium (OGC).  For example, should we pursue 3D tiles?  Any other OGC
> recommendation of high value?
>
>
>
> Any interest in working on OGC GeoPose for HAnim? (Numerous links follow,
> some are OGC member only)
>
>    - http://www.geopose.org
>    -
>    https://gisuser.com/2020/01/ogc-announces-the-creation-of-new-geopose-standards-working-group
>    -
>    https://github.com/opengeospatial/GeoPoseGuides/blob/main/reviewers_guide/pdf/geopose-reviewers-guide.pdf
>    - https://portal.ogc.org/files/?artifact_id=100082
>    -
>    https://github.com/opengeospatial/GeoPoseGuides/blob/working-draft/GeoPose-Reviewers-Guide.pdf
>    - https://github.com/opengeospatial/GeoPoseGuides/issues
>
>
>
> 6.       Michalis gave us a quick look at Khronos Certification Program.
> Interesting good topic for future discussion.  See his recent email for
> further details.
>
>
>
>    - https://www.khronos.org/3dcommerce/certification
>    - https://www.khronos.org/3dcommerce/certification/certified-viewers
>    - https://github.com/KhronosGroup/3DC-Certification
>    - https://github.khronos.org/3DC-Sample-Viewer
>
>
>
> 7.       As ever: no Web3D Consortium member-only information is included
> in these public minutes.
>
>
>
> and…   wait for it again…   Have Fun With X3D!     Or else.  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
>
>
> _______________________________________________
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> x3d-public at web3d.org
> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>
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