H-Anim Future Work and Outreach 2014

(Our meeting today is hosted by Myeong Won Lee and the Web3D Korea Chapter. Thank you - ham sa ham ni dah!)

Overview. Lots of activity continues to gradually proceed in H-Anim. These lists of suggested steps can help us stay organized and productive.

= Best practices

• Composition of partial behaviors
  • Additive (e.g. waving + sitting down)
  • Superposition(e.g. waving + walking)
• Inline and IMPORT/EXPORT conventions
  • LOA by LOA versions?

= Build Behavior Libraries

• Static position/posture poses
• Corresponding Displacer nodes

Examples

Examples are always a powerful way to show whether the specification is working or needs improvement.

Additional Examples Needed

• Anatomically correct human
• Animals
• Cartoon charchers (humanoid but not human)
• Conversion of BVH examples
• Skin (we will add Joe's examples, as they are tested)
• Clothing

There are a lot of things we will build - humans are complex! An independent archive may be needed, separate from the X3D Basic Examples Archive.

Human Skeleton

• Modified over years by Joe Williams and Damon Hernandez, origin uncertain
• Modified DEC 2013 by Joe Williams and Don Brutzman, checked into Medical examples at
  • http://www.web3d.org/x3d/content/examples/Basic/Medical
  • http://www.web3d.org/x3d/content/examples/Basic/Medical/BonesAllSkeleton.x3d
  • http://www.web3d.org/x3d/content/examples/Basic/Medical/SkeletonCompleteNoNormals.x3d
• Individual geometry files for each segment in human body, independently loadable
• Define how to change size to match a given body

Korean Characters

• prepared by MWL and students, excellent cartoon characters
• Joints/Segments and skin, H-Anim compliant, LOA?
• TODO add to Basic archives, find/review prior list of requested fixes

H-Anim Specification

• LOA 5 for all remaining animatable joints in human body? Discussion please
• Names for additional Joints, Segments, Sites
• Problem: how to we handle wrist joints as a directed acyclic graph (DAG) structure?
  • Physiology is different, apparently a mesh
  • Nevertheless each bone can only be in one position/orientation at a time
  • Thus a scene graph can show correct results, even if forces are complex
• We care most about the position/orientation of each bone
  • Typically we think of angle relationships between multiple bones
  • End result is what matters: position/orientation of each bone
  • Perhaps we should use the name "pseudo Joint" when this is a mismatch (such as carpal bones in wrist)

Medical considerations

• Confirm all names are anatomically accurate. Either change names or create new lists of names or create correspondences tables, to note how this works
• Joint, Segment and Site are also natural/logical/essential places to hang metadata and annotations

Tools

BVH Converter

• Algorithm needs to be documented, can we finish our blog entry?
• MWL's C++ code, described in slides, final fixes needed
• DPB to consider writing corresponding Java code

MWL H-ANIM Editor

• What is the name of this tool please?
• Can we announce availability?
• Excellent and novel capabilities - TODO list
• Can produce sophisticated animations

X3D Decorator

• New, under development
• XSLT stylesheet can follow "decorator pattern" to modify scene graphs
  • Converts .x3d to a modified .x3d
• Current support for canonical form, omitting default values, url corrections, minor fixups
• TODO add support for H-Anim
  • remove geometry from Joints/Segments/Sites
  • Add/replace geometry to Joints/Segments/Sites

X3D Schematron Validation

• X3D Schematron includes numerous validation rules
  • TODO list them?
• Are asymmetry warnings helpful?
• Still need rules for skin
• Lists of additional joint, segment, site names

Other stuff

• List of all non-animating joints in the body?