| drag left/right | xz rotation |
| drag up/down | yz rotation |
| shift+drag left/right | xw rotation |
| shift+drag up/down | yw rotation |
| alt+shift+drag left/right | xy rotation |
| alt+shift+drag up/down | zw rotation |
| - | |
| To get a handle on this, see the construction example. | |
| Red | First axis pair |
| Green | Second axis pair |
| Blue | Third axis pair |
Rotations:
{
"xy": 0,
"xz": 0,
"xw": 0,
"yz": 0,
"yw": 0,
"zw": 0
}