func (ushortComponent) PutMat3(b []byte, v [3][3]uint16) {
    binary.LittleEndian.PutUint16(b, v[0][0])
    binary.LittleEndian.PutUint16(b[2:], v[1][0])
    binary.LittleEndian.PutUint16(b[4:], v[2][0])
    binary.LittleEndian.PutUint16(b[8:], v[0][1])