[x3d-public] What is "loa" ?

Sat Jun 20 11:38:18 PDT 2020

https://www.web3d.org/documents/specifications/19774/V2.0/MotionDataAnimation/ExampleMocapAnimationMotionObject.html

This version of AnnexD is what I used - and it looks like an SFString 0 as
does values and jpints
WARNING - any examples from this AnnexD may need rework for web3d
-Doug

On Sat, Jun 20, 2020 at 12:21 PM Don Brutzman <brutzman at nps.edu> wrote:

> MUFTI you definitely want to be looking at the HAnim2 specifications.
>
> Web3D Consortium members are the controlling authority for X3D and HAnim
> specifications, International Standards Organization (ISO) certifies.
>
> X3D3 is simply implementing HAnim2, typically as tersely as possible so
> that there is no confusion in prose that HAnim2 is the controlling
> specification.  Please see
>
> * ISO/IEC 19774-1, HAnim2 Specifications parts 1 and 2
>    https://www.web3d.org/documents/specifications/19774/V2.0/
>
> ===============================================
> * ISO/IEC 19774-1, HAnim2 Specifications part 1
>    clause 3 Terms and definitions
>
> https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/glossary.html
>
> 3.11
>    level of articulation
>    LOA
>    degree of fidelity based on number of joints in an HAnim figure
> ===============================================
>
> also
>
> * 4.8.5 Levels of articulation
>
> https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/concepts.html#LevelsOfArticulation
>
> "Level of articulation (LOA) represents the complexity and detail of
> joints for a humanoid skeletal hierarchy, and can be used for generating
> various motions based on the joints. There are five levels of articulation:
>
>      LOA‑0 represents only the humanoid_root Joint object without an
> accompanying hierarchy, as shown in (Figure 4.3).
>      LOA‑1 represents the simplest organization and hierarchy of joints
> for a humanoid. There are 18 joints and 18 segments. Each segment has a
> joint in the hierarchy. Figure 4.4 represents LOA‑1 joints.
>      LOA‑2 consists of 71 joints and 71 segments (Figure 4.5).
>      LOA‑3 consists of 94 joints and 94 segments (Figure 4.6).
>      LOA‑4 builds on LOA‑3 by adding anatomical details of hands and feet
> (Figure 4.7). LOA‑4 consists of 148 joints and 148 segments. Hands and feet
> joints for LOA‑4 are illustrated in 4.9.3 and 4.9.4 respectively."
>
>
> * 4.9 Structure of a humanoid, 4.9.6 Hierarchy
>
> https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/concepts.html#Hierarchy
>
> * 4.9 Structure of a humanoid
>
> https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/concepts.html
>
> * Annex A (informative) Nominal human body dimensions and levels of
> articulation (LOAs)
>    Nominal human body dimensions and levels of articulation (LOAs)
>
> * A.2 Levels of articulation (LOAs)
>
> https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/BodyDimensionsAndLOAs.html#LevelsOfArticulation
>
> There is a lot of information in there that deserves careful reading.  You
> will find tables and diagrams that illustrate every joint and (bone)
> segment in the human body, along with a number of useful feature-point
> sites.  This took years of effort by many members of HAnim working group.
>
> Current work by Joe Williams, John Carlson and myself is improving
> past-legacy examples to match HAnim2 capabilities with X3D4.  We hope that
> testing and verification will help.
>
> * HumanoidAnimation X3D Examples Archive
>    https://www.web3d.org/x3d/content/examples/HumanoidAnimation
>
> * X3D Tooltips, HAnimHumanoid loa
>    https://www.web3d.org/x3d/content/X3dTooltips.html#HAnimHumanoid.loa
>
> HAnim designers hope that by identifying both HAnimHumanoid models and
> HAnimMotion animations with the LOA supported, it will be easier to
> mix/match models and animations.  Since each LOA is a strict subset of the
> next LOA, some compatibility is possible across human LOA levels.
>
> * 4.9.7 Site and Segment relationships
>
> https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/concepts.html#SiteSegmentRelationships
>
> It is not impossible to think that someday this work might even rise to
> the level of rigor needed for 3D HAnim models becoming part of medical
> records.  HAnim and X3D4 have the potential to help... everyone.
>
> Thanks for your scrutiny and helpful questions.
>
>
> On 6/18/2020 11:02 PM, John Carlson wrote:
> >
> > To answer your question, many parts of the government like to create
> acronyms.
> >
> > John
>
> Sorry John, can't blame government for this one.  (Wondering, are parts of
> the government controlling your keyboard?!)
>
> > On Fri, Jun 19, 2020 at 12:38 AM J. Scheurich <mufti11 at web.de <mailto:
> mufti11 at web.de>> wrote:
> >
> >     hI,
> >
> >     From
> >
> >
> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-WD1/Part01/components/hanim.html#HAnimMotion
> >
> >     SFInt32 [in,out] loa -1 [-1,4]
> >
> >     What does "loa" mean ? Fieldnames in X3D are often english words,
> >     but the dictionary leo.org <http://leo.org> has no results for
> "loa" 8-(
> >
> >     so long
> >     MUFTI
> 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
> http://faculty.nps.edu/brutzman
>
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