Operations on Geant4 scenes.
| scene-name | type s | Omittable : default value = |
| action | type s | Omittable : default value = refresh | Parameter candidates : accumulate refresh |
| action | type s | Omittable : default value = refresh | Parameter candidates : accumulate refresh |
| scene-name | type s | Omittable : default value = all | |
| verbosity | type s | Omittable : default value = 0 |
| scene-name | type s | Omittable : current value is used as the default value. | |
| refresh-flush | type s | Omittable : default value = refresh | Parameter candidates : refresh flush |
| scene-name | type s |