The result of 360 degree cubic panorama player looks like this. Type keys to rotate/zoom the panorama image.
"s" home position
"a" rotate left
"d" rotate right
"w" rotate up
"x" rotate down
"-" zoom in
"+" zoom out

実行するとこんな感じで表示されます。キーボードを使って回転させます。

I should do the following thins to fix issues or enhance usability.　次のような点を改善しなければなりません。
1. Rotate -90 degree of the initial image
2. Use mouse rather than keyboard
3. Fix bugs of rotation
4. Limit the FOV not to show black portion