RigModels.com is baded on ThreeJS, you may use their programmings by reading website HTML/JS:
Useful links:
https://rigmodels.com/3d.php?view=MCRH01YX820KXIMJ6N1FF4HIP&ee=&mobileuser=0
https://rigmodels.com/3d_LOD.php?view=MCRH01YX820KXIMJ6N1FF4HIP