_numFaces = input.UnpackUShort();
_faces = new Face[_numFaces];
for (int i = 0; i < _numFaces; i++)
_faces[i].Indices = new short[] { input.UnpackShort(), input.UnpackShort(), input.UnpackShort() };
if (_hasWeights)
{
_numSkinJoints = input.UnpackUShort();
_skinJoints = new String[_numSkinJoints];