[x3d-public] Design patterns for HAnimHumanoid skin and apparel using HAnim2standard in X3D4

Mon Dec 26 09:49:44 PST 2022

Thanks Joe, excellent addition.  I added a warning note to X3D-Edit HAnimSite panel to remind about proper suffix, changes color to darkorange if that naming convention not observed.

*	X3D Tooltips: HAnimSite, name
*	Warning: HAnimSite name must end in '_tip' or '_view' or '_pt' suffix.
*	https://www.web3d.org/x3d/tooltips/X3dTooltips.html#HAnimSite.name

Updated node:

            <HAnimSite DEF='a_feature01_tip' name='feature01_tip'>

              <Shape DEF='SiteVisualization'/>

            </HAnimSite>

Also added Group as parent of multiple Humanoids as recommended by

*	HAnim2 Part 1, HAnim architecture, E.4 Multiple humanoids per file
*	https://www.web3d.org/documents/specifications/19774/V2.0/Architecture/Guidelines.html#MultipleHumanoidsPerFile

Checked into version control, archive update in progress.

*	X3D Example Archives: Humanoid Animation, Skin, Design Patterns Apparel Medical Skin Layers
*	https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Skin/DesignPatternsApparelMedicalSkinLayersIndex.html

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: Joseph D Williams <joedwil at earthlink.net> 
Sent: Sunday, December 25, 2022 12:31 PM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>; X3D Public Mailing List (x3d-public at web3d.org) <x3d-public at web3d.org>
Cc: h-anim at web3d.org; Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
Subject: RE: Design patterns for HAnimHumanoid skin and apparel using HAnim2standard in X3D4

In the example:

<HAnimHumanoid DEF='a.SimpleSkeleton' name='SimpleSkeleton' version='2.0'>

<HAnimJoint containerField='skeleton' name='humanoid_root' ulimit='0 0 0' llimit='0 0 0'>

<HAnimSegment name='sacrum'>

<Shape DEF='JointVisualization'/>

<Shape DEF='SegmentVisualization'/>

</HAnimSegment>

</HAnimJoint>

</HAnimHumanoid>

Under Segment, probably will use:

…

<HAnimSegment name='sacrum'>

  <Shape DEF='JointVisualization'/>

  <Shape DEF='SegmentVisualization'/>

  <HAnimSite name='feature01'>

   <Shape DEF='SiteVisualization'/>

  </HAnimSite>

</HAnimSegment>

…

And, with Site, we can use sensors and anything else. 

Thanks, 

Joe

From: Brutzman, Donald (Don) (CIV) <mailto:brutzman at nps.edu> 
Sent: Saturday, December 24, 2022 11:42 AM
To: X3D Public Mailing List (x3d-public at web3d.org) <mailto:x3d-public at web3d.org> 
Cc: h-anim at web3d.org <mailto:h-anim at web3d.org> ; Joseph D Williams <mailto:joedwil at earthlink.net> ; Brutzman, Donald (Don) (CIV) <mailto:brutzman at nps.edu> 
Subject: Design patterns for HAnimHumanoid skin and apparel using HAnim2standard in X3D4

Joe, thanks for steady efforts making progress on HAnim models.  Your latest examples are online as follows, with diagnostics and testing continuing.  At some point we will want to produce cleaned-up versions of legacy BoxMan models too.

*	X3D Example Archives: Humanoid Animation, Skin
*	https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Skin

In order to keep track of all the different ways that apparel might be included with an HAnim2 X3D4 model, we have come up with the following list of possibilities.

*	https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Skin/DesignPatternsApparelVariations.txt

   Design patterns for HAnimHumanoid presenting skin and apparel

                   using HAnim2 standard in X3D4

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

a. *Simple Skeleton*. skeleton field, simple skeleton structure, invisible or

    visualized by rendered ball-and-stick for joints, segments, sites.

b. *Simple Skeleton Mesh*. skeleton field, Shape geometry attached to segments,

   moving with skeleton but rendering is crude since no deformation occurs

   during animation if overlapping.

c. *Skin, Indexed Geometry only*. skin field, indexed Coordinate mesh with

   skinCoordIndex and weight connections at each of joint nodes for browser

   performance of smooth deformation when moving.

d. *Skin, Shape holding indexed geometry*. Allow skin field to hold Shape

   containing Appearance with Material or texture, similarly holding indexed

   mesh with skinCoordIndex connections at joints for smooth deformation 

   when moving. (Specification revision pending, Mantis 1408).

e. *Switch or LOD*. Similarly allow skin field to hold Switch or LOD, then a

   single Shape holding indexed mesh.  If agreed upon that this is extremely

   similar will require specification change resembling Mantis 1408.

f. *Synthesis*. Extra-large Coordinate mesh using duplicate points for 

   inner-volume (flesh mesh) and outer-volume (apparel mesh) geometry.  

   Likely possible with existing X3D4 specification but requires complex

   preprocessing of humanoid geometry.  Applying cloth physics likely not

   practical or possible.

g. *Apparel*. Add apparel field to future specification versions (namely

   HAnim2.1 and X3D4.1), allowing separate definition of clothing that is

   independent of skin mesh.  Likely want an MFNode array to permit multiple

   clothing layers.  Likely need to consider special cases for cloth physics.

h. *Anatomy*.  Similar to apparel field: multiple epithelial tissue layers

   for surfaces of human organs are common, often with similar construction

   about concentric center-line spine through deformable organ.  This suggests

   that an adapted Extrusion node may be more relevant than meshes.  Likely 

   will also need to consider special cases for organ physics.  Note that this

   is similar (possibly identical) rationale to preceding analysis of apparel.

also thanks to Vince and Dick for thoughtful discussions as we have proceeded.

Happy Holidays everyone!

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

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