Visualization commands.
| enabled | type b | Omittable : default value = 1 |
| verbosity | type s | Omittable : default value = warnings |
| PVname | type s | Omittable : default value = world | |
| system | type s | Omittable : default value = ATree |
| physical-volume-name | type s | Omittable : default value = world |
| theta-deg | type d | Omittable : default value = 0 | |
| phi-deg | type d | Omittable : default value = 0 | |
| pan-right | type d | Omittable : default value = 0 | |
| pan-up | type d | Omittable : default value = 0 | |
| pan-unit | type s | Omittable : default value = cm | |
| zoom-factor | type d | Omittable : default value = 1 | |
| dolly | type d | Omittable : default value = 0 | |
| dolly-unit | type s | Omittable : default value = cm |
| graphics-system-name | type s | Parameter candidates : DAWNFILE OGLIX OGLSX VRML1FILE VRML2FILE | |
| pixels | type i | Omittable : default value = 600 |
| logical-volume-name | type s |