These Humanoid Animation (HAnim) example models illustrate conversion from BioVision Hierarchy (BVH) files for Character animation (such as 1.bvh). BVH files are often produced using Motion Capture (MOCAP) techniques.
The HAnim version 2.0 specifications are published and freely available:
This viewpoint slideshow is online at https://www.web3d.org/x3d/content/examples/HumanoidAnimation/MotionAnimation/viewpointSlideshow.html
Viewpoint image version history at https://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/content/examples/HumanoidAnimation/MotionAnimation/_viewpoints