Motion Capture (MOCAP) examples using Humanoid Animation (HAnim) models illustrates conversion from BioVision Hierarchy (BVH) files for Character animation (such as 1.bvh).
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