From Garry's Mod
Warning! Decimal values are for reference only! The actual value may be different between two Garry's Mod versions.
|OBS_MODE_FIXED||3||Same as OBS_MODE_CHASE, but you can't rotate the view|
|OBS_MODE_IN_EYE||4||First person cam|
|OBS_MODE_CHASE||5||Chase cam, 3rd person cam, free rotation around the spectated target|
|OBS_MODE_ROAMING||6||Free roam/noclip-alike. Does not work from GM:PlayerDeath|