[x3d-public] [x3d] Spec Comment by dougsanden on 19774-2: HAnim Motion Capture

Don Brutzman brutzman at nps.edu
Wed May 27 07:14:36 PDT 2020


[cc: x3d-public]

Doug, thanks for this work.  It is interesting to consider that we might be able to map the HAnim specification's Motion object more effectively into X3D4 than the baseline HAnimMotion approach.

[1] HAnim 2 Specification, Parts 1 and 2
     https://www.web3d.org/documents/specifications/19774/V2.0/index.html

[2] Humanoid Animation (HAnim): Motion Data Animation, Concepts
     https://www.web3d.org/documents/specifications/19774-2/V2.0/MotionDataAnimation/MotionDataAnimation.html
     https://www.web3d.org/documents/specifications/19774-2/V2.0/MotionDataAnimation/Concepts.html

[3] Humanoid Animation (HAnim) 19774-2 part 2: clause 6 HAnim motion data animation using Motion objects
     https://www.web3d.org/documents/specifications/19774-2/V2.0/MotionDataAnimation/MotionNodes.html

[4] Extensible 3D (X3D) 4.0 Tooltips: HAnimMotion
     https://www.web3d.org/x3d/content/X3dTooltips.html#HAnimMotion

[5] Web3D Mantis: view issues
     https://www.web3d.org/member-only/mantis/view_all_bug_page.php

TODO: Mantis issue needed.

Wondering, might you present this issue during Friday morning's X3D Working Group teleconference?  Discussion would help, interested attendees welcome.  If you like we can record video too - whatever works.  Thanks for considering these possibilities.

v/r Don

On 5/27/2020 5:40 AM, Spec Feedback wrote:
> -- Submitter indicates that this comment may be public: *Yes* --
> 
> Comment on 19774-2: HAnim Motion Capture - V1.0
> 4.4.4 mapping and Motion
> 
> 
> -----------------
> In previous comments I proposed having a split of Motion into MotionPlay and
> MotionData/MotionDataFile nodes. With MotionDataFile and downloaing .bvh
> mocap motion capture files off the internet, there are 2 issues
> 1. mapping of joint names
> 2. accumulating rotations over skipped/ignored joints
> This comment is For issue#1, joint name mapping. In a previous comment I
> enumerated ways to map:
> 1. compiled in common name mappings
> 2. geometrical mapping
> 3. explicit name mapping
> This comment is for method #3 explicit name mapping.
> Currently: in our HH HAnimHumanoid we can name each joint whatever we want.
> And in the Motion.joints field, we need to use the same naming scheme. The
> Motion node and HH are in the same scene file and a single scene author would
> author both nodes.
> Proposed: for the split MotionData/MotionDataFile it will be handy to have
> some way to re-use motions downloaded off the internet with multiple x3d
> scenes without having to with name lookup permutations for each combination
> of HH and MotionDataFile.
> One way to add consistency / universality is to map HH names to a consistent
> benchmark naming scheme, and same with downloaded bvh.
> And one way to do that is with a field or node for mapping to LOA1, LOA2,
> LOA3 standard joint names.
> - each HH would have this mapping field/node to get from scene-authored joint
> names to standard LOA names
> - and each Motion, MotionData, MotionDataFile would also have a mapping from
> its joint names to standard LOA names.
> Then the code would do 2 lookups when matching joints to motions:
> 1. HH name to standard LOA name
> 2. standard LOA name to MotionData joint name
> This 2=step process would allow different HH to be paired with different
> MotionDataFile/MotionData without the scene author needing to redo naming for
> each permutation - they would do mappings for each once.
> -----------------
> 
> Submitted on Wednesday, 2020,  May 27 - 6:40am
> by dougsanden (dougsanden )
> IP: 75.159.18.239
> 
> See: https://www.web3d.org/node/1694/submission/4018
> _______________________________________________
> x3d mailing list
> x3d at web3d.org
> http://web3d.org/mailman/listinfo/x3d_web3d.org

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



More information about the x3d-public mailing list