three.js skinned mesh bug

some bugs when skinned mesh origin is not visible by camera or light leads to clipping of shadow or mesh itself

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/87/three.min.js"></script>
<input type="button" value="clipped shadow" onclick="pos(-40, 40, -40)"/>
<input type="button" value="clipped mesh" onclick="pos(-20, 20, -20)"/>
<input id="cullbtn" type="button" value="toggle culling (on)" onclick="toggle()"/>

JavaScript

var json = '{ "normals":[-5.32907e-15,-1,2.98023e-08,1.06581e-14,1,-2.98023e-08,1,4.47034e-08,2.83122e-07,-2.83122e-07,-7.45059e-08,1,-1,-1.3411e-07,-2.23517e-07,2.38419e-07,1.78814e-07,-1], "faces":[33,0,1,2,3,0,0,0,0,33,4,7,6,5,1,1,1,1,33,0,4,5,1,2,2,2,2,33,1,5,6,2,3,3,3,3,33,2,6,7,3,4,4,4,4,33,4,0,3,7,5,5,5,5], "uvs":[], "skinIndices":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], "skinWeights":[0,0.987523,0,0.999995,1,0,0,1,0,0.999996,0,1,0,1,0,0.999996], "bones":[{ "pos":[0,0,-0], "parent":-1, "rotq":[0.707107,0,-0,0.707107], "name":"Bone", "scl":[1,1,1] }], "influencesPerVertex":2, "metadata":{ "normals":6, "bones":1, "uvs":0, "generator":"io_three", "faces":6, "type":"Geometry", "version":3, "vertices":8 }, "animations":[{ "fps":24, "length":3.29167, "hierarchy":[{ "parent":-1, "keys":[{ "pos":[0,0,-0], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0 },{ "pos":[0.401199,-1.41827e-05,-0.0904806], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.0416667 },{ "pos":[1.61402,-5.94237e-05,-0.368285], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.0833333 },{ "pos":[3.64092,-0.000135782,-0.841523], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.125 },{ "pos":[6.46499,-0.000244535,-1.51553], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.166667 },{ "pos":[10.0445,-0.000385899,-2.39165], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.208333 },{ "pos":[14.3083,-0.00055924,-3.46595], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.25 },{ "pos":[19.1524,-0.00076289,-4.72809], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.291667 },{ "pos":[24.4403,-0.000994044,-6.1607], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.333333 },{ "pos":[30.0075,-0.00124877,-7.7394], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.375 },{ "pos":[35.67,-0.00152218,-9.43385], "rot":[0.707107,0,-0,0.707107], "scl":[1,1,1], "time":0.416667 },{ "pos":[41.2372,-0.0018087,-11.2096], "rot":[0.707107,0,-0,0.707107],...