Hologram (Fallout: New Vegas)

Holograms are three dimensional projections in the Sierra Madre in 2281.

Gameplay attributes
In general, holograms are hostile to the Courier. Some particular holograms are vendors, so they are not hostile and can be traded with. They do not accept bottle caps as currency; instead they must be bartered with using other items, prominently pre-War money. Otherwise, holograms can be found patrolling the Sierra Madre Casino as security measures. When a hologram detects an intruder, it will turn yellow for a short period. This is the cautionary color and is telling the intruder to back off. If the intruder doesn't comply it turns red and begins to fire upon them.

Holograms boast a highly damaging beam of energy as their only attack. Holograms cannot be damaged, practically speaking. Though they have a finite amount of hit points, they have a special regeneration ability, which replenishes the hit points they lose instantly. Holograms usually patrol on a pre-programmed path and will not stray off of it. Careful examination of this path can make it easier to avoid confrontation. Additionally, there are hologram transmitters that can be turned off in order to get rid of them.

Hologram (security)
This version of the hologram is the main security version. They appear in the Villa clinic and in the Sierra Madre Resort & Casino. It appears to be wearing Sierra Madre security armor. The emergency defense system activated these holograms when the bombs dropped, and they are still actively patrolling. It best to avoid being seen by these holograms, or to find their emitters and disable them. The security holograms can disguise themselves as other holograms, so watch out.

Hologram (male)
These are generic friendly male holograms.

Hologram (female)
Generic friendly female holograms. There are multiple copies of this non-player character in varying states of completion - some bleed when shot, can be spoken to, or carry holographic laser pistols instead of using the standard hologram head laser.

Starlet hologram
Hand-sculpted by a Big MT physicist, the starlet holograms all have the appearance of Vera Keyes. Unlike security holograms, Vera Keyes holograms don't always attack the Courier, the exceptions being the hologram in Vera's room, and the executive suites. Outside the Sierra Madre Resort & Casino, there's an additional starlet hologram, featured very prominently, in the central non-functioning Villa fountain.

Hologram vendor
Throughout the Sierra Madre there are several vendors from which to buy various items, such as food and drinks. Vendor locations include the Casino cashier's cage, and the cafe. This type of hologram will ignore attacks, and will not turn hostile towards the Courier.

Although they have no bottle caps (being pre-War tech), the vendors carry large quantities of pre-War money which you can use to barter with them.

Dean Domino hologram
The Dean Domino hologram is a stage-performing hologram found in The Tampico theater at the Sierra Madre Resort & Casino. During the quest Curtain Call at the Tampico, the hologram of Dean Domino will perform the song "Something's Gotta Give", on the Tampico stage. After the song, he will receive some applause from hologram spectators, and subsequently disappear from the stage.

Behind the scenes

 * Programmers of the security holograms were directly influenced by the motion picture The Day the Earth Stood Still for the hologram's hostile stance.

Bugs

 * When seeing a hologram and then quickloading the game, the hologram's color can go dark. They still flicker, but they won't be blue anymore, and it may be hard to see them. Only way to fix this is to open console click on the hologram till the hologram non-player character's ref. ID shows up and type "resurrect".
 * Rarely, they can be killed with gas bomb, frag grenade or C4 and give 10-20 xp.

Appearances
Holograms appear in the Fallout: New Vegas add-ons Dead Money and Old World Blues.