func (ushortComponent) PutVec3(b []byte, v [3]uint16) {
    binary.LittleEndian.PutUint16(b, v[0])
    binary.LittleEndian.PutUint16(b[2:], v[1])
    binary.LittleEndian.PutUint16(b[4:], v[2])
}