gistfile1.txt

if ( group.userData.bones !== undefined ) {

	armature = group

	var bones = createBones( armature, group.userData.bones )

	armature.updateMatrixWorld()
	armature.userData.skeleton = new THREE.Skeleton( bones, undefined, true )
	
	console.debug( 'skeleton', armature.userData.skeleton )

	skeletonHelper = new THREE.SkeletonHelper( armature )
	skeletonHelper.material.fog = false
	// skeletonHelper.layers.set( LAYER.HELPERS )
	scene.add( skeletonHelper )

	if ( scene.animations && scene.animations.length !== 0 ) {

		mixer = armature.userData.mixer = new THREE.AnimationMixer( armature )
		console.log( 'mixer', mixer )

		const animation = scene.animations ? scene.animations[ 0 ] : null
		console.log( 'animation', animation )

		action = mixer.clipAction( animation ).play()
		console.log( 'action', action )

	}

}

======================================

// Copied fropm SkinnedMesh constructor
function createBones ( object, jsonBones ) {

	const bones = [];

	var bone, gbone;

	// create bones from json bone data
	for ( var b = 0, bl = jsonBones.length; b < bl; ++ b ) {

		gbone = jsonBones[ b ];

		bone = new THREE.Bone();
		bone.name = gbone.name
		bone.position.fromArray( gbone.pos )
		bone.quaternion.fromArray( gbone.rotq )
		if ( gbone.scl !== undefined ) bone.scale.fromArray( gbone.scl );

		bones.push( bone )

	}

	// set parent relations
	for ( var b = 0, bl = jsonBones.length; b < bl; ++ b ) {

		gbone = jsonBones[ b ]

		if ( gbone.parent !== -1 && gbone.parent !== null && bones[ gbone.parent ] !== undefined ) {

			bones[ gbone.parent ].add( bones[ b ] )

		} else {

			object.add( bones[ b ] )

		}

	}

	return bones

}