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Changes: Zero Point Energy Field Manipulator

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{{Cleanup}}
  
{{Cleanup}}
 
{{Weapon Infobox
  
{{Weapon Infobox
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| image=[[File:Gravity Gun.jpg|250px|Default]] [[File:Gravity Gun super.jpg|250px|Supercharged]]
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| image=<gallery>Gravity Gun.jpg|Regular
  ⚫
Gravity Gun super.jpg|Super
  ⚫
</gallery>
 
| name= Zero Point Energy Field Manipulator
  
| name= Zero Point Energy Field Manipulator
 
| affiliation= [[Resistance]]
  
| affiliation= [[Resistance]]
−
| damage= Varies depending on the object
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| damage= Varies depending on the object used
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| rate of fire=120 RPM
 
| accuracy= Varies
  
| accuracy= Varies
 
| range= Short to medium
  
| range= Short to medium
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*[[Alyx Vance]]
  
*[[Alyx Vance]]
 
*[[Wallace Breen]] (briefly in the ''[[Half-Life 2 storyline#Dark Energy|Dark Energy]]'' chapter)
  
*[[Wallace Breen]] (briefly in the ''[[Half-Life 2 storyline#Dark Energy|Dark Energy]]'' chapter)
  +
*[[Overwatch Elite]] (Briefly carried to Breen's desk).
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| entity=*weapon_physcannon
  
  +
*[[Dog]] (arm integration)
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*physcannon_mega_enabled 1
  
  ⚫
| entity=*<code>weapon_physcannon</code>
  ⚫
*<code>physcannon_mega_enabled 1</code>
 
}}
  
}}
   
 
{{Quote|The Zero Point Energy Field Manipulator is not a toy, Alyx!|[[Judith Mossman]]|Half-Life 2}}
  
{{Quote|The Zero Point Energy Field Manipulator is not a toy, Alyx!|[[Judith Mossman]]|Half-Life 2}}
   
−
The '''Zero Point Energy Field Manipulator''' ('''ZPEFM'''), most commonly known as the '''Gravity Gun''', is a tractor beam-type weapon that was originally designed for handling hazardous materials, but, as [[Alyx Vance|Alyx]] stated, was primarily used for heavy lifting. At its core is a substance that appears to be a [[Xen crystal]]. Introduced to the player by Alyx Vance shortly after arrival at [[Black Mesa East]], the Gravity Gun soon becomes an invaluable tool in Gordon's arsenal and is considered one of his trademark weapons.
 +
The '''Zero Point Energy Field Manipulator''', commonly known as the '''Gravity Gun''', is a tractor beam-type weapon designed for handling hazardous materials, but as [[Alyx Vance]] stated, primarily used for heavy lifting. At its core is a substance that appears to be a [[Xen crystal]]. Introduced to the player by Alyx Vance shortly after arrival at [[Black Mesa East]], the Gravity Gun soon becomes a valuable tool in [[Gordon Freeman]]'s arsenal. The Gravity Gun is considered one of Freeman's trademark weapons alongside his signature weapon, the [[crowbar]].
   
 
==Overview==
  
==Overview==
  ⚫
The Gravity Gun has two modes. The primary fire releases an energy blast that punts the targeted object with tremendous force. The gravity gun is useful for clearing out barriers and moving heavy objects. The secondary fire picks items up and holds them just ahead of the gun. These objects can then either be dropped by pressing the secondary fire button a second time or punted with the primary fire. The secondary fire can only pick up lighter objects, mainly those which Gordon himself could carry, but the prime fire is capable of punting much larger things even if the secondary fire cannot affect them. The gun cannot affect most organic material, though there are a few exceptions, such as wood.
  +
 
[[File:Alyx gravity gun first retrieving.jpg|thumb|200px|left|Alyx introduces the Gravity Gun to Gordon at Black Mesa East.]]
  
[[File:Alyx gravity gun first retrieving.jpg|thumb|200px|left|Alyx introduces the Gravity Gun to Gordon at Black Mesa East.]]
⚫
The gravity gun has two basic modes. The primary fire releases an energy blast which punts the targeted object with tremendous force. This is useful for clearing out barriers and moving heavy objects. The secondary fire picks objects up and holds them just ahead of the gun. These objects can then either be dropped by pressing the secondary fire button a second time or punted with the primary fire. The secondary fire can only pick up lighter objects, mainly those which Gordon himself could carry, but the primary fire is capable of punting much larger objects even if the secondary fire cannot affect them. The gun cannot affect most organic material, though there are a few exceptions.
  
   
−
The combination of the gravity gun's secondary and primary fire modes allow it to be used as a powerful weapon. Since it uses physics objects rather than conventional ammunition, there is virtually no limit to how many times it can be fired; however, this advantage is balanced by the need to "reload" after every shot by grabbing a new object. Depending on the object fired, the gravity gun is potentially one of the most damaging weapons in the game. Heavier objects like metal barrels and propane tanks can kill even Overwatch soldiers in a single hit, but conversely things like plastic crates and wooden pallets will do very little damage due to their lesser mass. Explosive barrels in particular are a highly devastating weapon when combined with the gravity gun, but this has the potential to backfire if the enemy shoots them while they are being held. The gravity gun is most effectively used as a short to mid-range weapon, since the physics objects it uses for ammunition are affected by gravity.
 +
The combination of the Gravity Gun's secondary and primary fire modes allow it to be used as a powerful weapon. Since it uses physics-based objects rather than conventional ammunition, there is virtually no limit to how many times it can be fired; however, this advantage is balanced by the need to "reload" after every shot by grabbing a new object.
  +
  +
Depending on the object fired, the gravity gun is potentially one of the most damaging weapons in the game. Heavier items like metal barrels and propane tanks can kill even [[Overwatch Soldier|Overwatch soldiers]] in a single hit conversely, things like plastic crates and wooden pallets will do very little damage due to their lesser mass. Explosive barrels, in particular, are a highly devastating weapon when combined with the gravity gun, but this has the potential to backfire if the enemy shoots the barrel while being held by the gravity gun.
  +
  +
The Gravity Gun is most effectively used as a short to mid-range weapon since the physics objects it uses for ammunition are affected by gravity. Because of this, the gravity gun is one of the most suitable weapons for [[Ravenholm]] before getting the [[Shotgun (HL2)|shotgun]], due to the large amounts of environmental props and the fact that ammunition is somewhat scarce there.
   
 
In addition to its use as a weapon, the secondary fire of the gun can be used to pull objects over from a distance, allowing Gordon to access supplies or other objects that would otherwise be out of reach. It can also be used to grab larger objects and hold them up as makeshift shields. Though normally unable to drag heavier objects, it proves capable of doing so in a select few areas, mainly as a way to create bridges. It should be noted that the secondary fire of the gravity gun does not automatically tractor in targeted objects. The object must be brought within a certain distance for the field to capture it, during which time it is still subject to gravity. The gun must also be constantly trained on the object to maintain the effect until it is captured.
  
In addition to its use as a weapon, the secondary fire of the gun can be used to pull objects over from a distance, allowing Gordon to access supplies or other objects that would otherwise be out of reach. It can also be used to grab larger objects and hold them up as makeshift shields. Though normally unable to drag heavier objects, it proves capable of doing so in a select few areas, mainly as a way to create bridges. It should be noted that the secondary fire of the gravity gun does not automatically tractor in targeted objects. The object must be brought within a certain distance for the field to capture it, during which time it is still subject to gravity. The gun must also be constantly trained on the object to maintain the effect until it is captured.
   
  +
[[File:Strider Buster held.jpg|thumb|right|200px|[[Magnusson Device]] being held by the Gravity Gun.]]
⚫
In addition to its primary uses, the gravity gun can be used in more esoteric ways. [[Manhack]]s, [[City Scanner]]s and [[Shield Scanner]]s can all be held and punted by the gun; the former, in particular, can be held by the gun for use as a makeshift chainsaw. All three are heavy enough to deal significant damage if punted, and will be destroyed if punted into a nearby wall. However, if punted over greater distances, they will stabilize their flight. It can also be used to grab [[Hopper Mine]]s and remove [[Rollermine]]s from vehicles, holding them safely. Hopper Mines grabbed in such a manner will automatically switch to recognize the player and their allies as friendly when planted again, while a Rollermine held with the gravity gun will be reprogrammed by Alyx, if she's around, to attack hostile targets instead of friendlies. Both types of mine can also be punted into enemies directly. [[Combine Sentry Gun]]s can also be manipulated by the gun.
  
  +
  ⚫
In addition to its primary uses, the Gravity Gun can be used in more esoteric ways. [[Manhack]]s, [[City Scanner]]s, and [[Shield Scanner]]s can all be held and punted by the gun; the former, in particular, can be held by the gun for use as a makeshift chainsaw. All three are heavy enough to deal significant damage if punted and will be destroyed if punted into a nearby wall. However, if punted over greater distances, they will stabilize their flight. It can also be used to grab [[Hopper Mine]]s and remove [[Rollermine]]s from vehicles, holding them safely.
  +
  +
Hopper Mines grabbed in such a manner will automatically switch to recognize the player and their allies as friendly when planted again, while a Rollermine held with the gravity gun will be reprogrammed by Alyx, if she's around, to attack hostile targets instead of friendlies. Both types of mine can also be punted into enemies directly. [[Combine Sentry Gun]]s can also be manipulated by the gun.
   
 
Though the gun cannot affect most organic matter, [[Headcrab]]s and [[Antlion]]s are vulnerable to the primary fire. Three punts from the primary fire will kill any headcrab. Antlions are harder to kill in this manner, but being hit by the gun causes them to flip over, exposing their weaker undersides.
  
Though the gun cannot affect most organic matter, [[Headcrab]]s and [[Antlion]]s are vulnerable to the primary fire. Three punts from the primary fire will kill any headcrab. Antlions are harder to kill in this manner, but being hit by the gun causes them to flip over, exposing their weaker undersides.
   
−
==Dark Energy Field Manipulator==
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==Dark Energy Field Manipulator (Super Gravity Gun)==
  +
[[File:D3 citadel 030116.JPG|thumb|left|200px|The Gravity Gun being transformed.]]
⚫
When exposed to the [[Confiscation Field]] in the [[Citadel]], the Gravity Gun is "supercharged" rather than being vaporized as other weapons are. It also shorts out the field in the process. Once supercharged, the Gravity Gun emits blue light rather than orange, quakes in Gordon's hands, and creates small bolts of energy across its muzzle. Its powers are vastly enhanced, enabling it to manipulate objects of far greater mass than it could normally, as well as pull and repel them with greater force. Its most significant enhancement, however, is its ability to manipulate organic matter. Any [[Overwatch Soldier]] punted by it is instantly killed, and their body retains a charge that will kill others if it strikes them. If grabbed by the gun's secondary fire, they are likewise killed. It also has the side effect of vaporizing any weapons the soldiers were carrying.
  
  +
  ⚫
When exposed to the [[Confiscation Field]] in the [[Citadel]], the Gravity Gun is "supercharged" rather than being vaporized as other weapons are. It also shorts out the field in the process. Once supercharged, the Gravity Gun emits blue light rather than orange, quakes in Gordon's hands, and creates small bolts of energy across its muzzle. Its powers are vastly enhanced, enabling it to manipulate objects of far greater mass than it normally could as well as pull and repel them with greater force. Its most significant enhancement, however, is its ability to manipulate organic matter. Any [[Overwatch Soldier]] punted by it is instantly killed, and their body retains a charge that will kill others if it strikes them. If grabbed by the gun's secondary fire, they are likewise killed. It also has the side effect of vaporizing any weapons the soldiers were carrying.
   
−
The first time the Gravity Gun is supercharged is in ''[[Half-Life 2]]'''s thirteenth chapter, ''[[Half-Life 2 storyline#Our Benefactors|Our Benefactors]]'', when Gordon's pod deposits him into a Confiscation Field and remains so until the end of the game. During this time, Gordon's [[HEV Suit]] also becomes 'supercharged' to the point of harboring 200% energy, and power chargers restore Gordon's health as well. At the start of ''[[Half-Life 2: Episode One|Episode One]]'', it is no longer supercharged, but becomes charged again after Gordon and Alyx re-enter the Citadel to stabilize the [[Citadel Core|core]] when Gordon accidentally enters another Confiscation Field. It remains supercharged until Gordon reactivates the core's containment field, at which point the Gravity Gun reverts to its normal state.
 +
The first time the Gravity Gun is supercharged is in ''[[Half-Life 2]]''<nowiki>'</nowiki>s twelfth chapter, ''[[Half-Life 2 storyline#Our Benefactors|Our Benefactors]]'' when Gordon's pod deposits him into a Confiscation Field and remains so until the end of the game. During this time, Citadel power chargers restore Gordon's health and boost energy to 200% as well. At the start of ''[[Episode One]]'', it is no longer supercharged (yet the chargers keep the effect from the first game's citadel) but becomes charged again after Gordon and Alyx re-enter the Citadel to stabilize the [[Citadel Core|core]] when Gordon accidentally enters another Confiscation Field. It remains supercharged until Gordon reactivates the core's containment field, at which point the Gravity Gun reverts to its normal state.
   
 
==Behind the scenes==
  
==Behind the scenes==
  ⚫
[[File:Eli proto physics.jpg|thumb|right|200px|Concept art for the early "prototype physics manipulator" being held by Eli Maxwell.]]
⚫
*As heard in sound files featured in the playable [[Half-Life 2 Beta|''Half-Life 2'' Beta]] files, Eli was to explain to Gordon at Black Mesa East that the Gravity Gun's "grand daddy" was used to manipulate hazardous materials in the Combine's portal reactors, suggesting the Gravity Gun uses Combine technology.<ref name="HL2Bpf">Playable [[Half-Life 2 Beta|''Half-Life 2'' Beta]] files</ref>
  
   
  ⚫
*As heard in sound files featured in the playable [[Half-Life 2 Beta|''Half-Life 2'' Beta]] files, Eli was to explain to Gordon at Black Mesa East that the Gravity Gun's "granddaddy" was used to manipulate hazardous materials in the Combine's portal reactors, suggesting the Gravity Gun uses Combine technology.<ref name="HL2Bpf">Playable [[Half-Life 2 Beta|''Half-Life 2'' Beta]] files</ref>
⚫
*Exactly how the Gravity Gun works is unknown, but some conclusions can be made. It is possible it uses a Xen crystal, as the emitter is almost identical to a sample being studied in [[Eli Vance|Eli]]'s lab in Black Mesa East. When the gun is supercharged by a Confiscation Field, [[Overwatch Voice|Overwatch]] describes it as a "counter-resonant singularity device". Because of this, it probably contains negative mass, or exotic mass. Negative mass is believed, by scientists, to have inverted gravity and repel normal mass instead of attracting it. The gravity gun may possibly control the gravity attribute of the crystal, making it able of both attracting and repelling objects. How the weapon should be able to concentrate the gravitational force at a single object is, however, unknown.
  
   
  ⚫
*Exactly how the Gravity Gun works is unknown, but some conclusions can be made. It is possible it uses a Xen crystal, as the emitter is almost identical to a sample being studied in [[Eli Vance|Eli]]'s lab in Black Mesa East. When the gun is supercharged by a Confiscation Field, [[Overwatch Voice|Overwatch]] describes it as a "counter-resonant singularity device". Because of this, it probably contains negative mass or exotic mass. Negative mass is believed, by scientists, to have inverted gravity and repel normal mass instead of attracting it. The gravity gun may possibly control the gravity attribute of the crystal, making it able of both attracting and repelling objects. How the weapon should be able to concentrate the gravitational force at a single object is, however, unknown.
⚫
* In physics, zero-point energy is a quantum mechanical phenomenon where the lowest of a system has non-zero energy. This has been measured, for instance, in the Casimir Effect, where it was shown the "empty space" is not in fact empty and that quantum fluctuations are real. There have been various hoax claims of ways to harness zero-point energy but no known successes. Zero-point energy does not violate any laws of physics.
  
   
  ⚫
*In physics, zero-point energy is a quantum mechanical phenomenon where the lowest of a system has non-zero energy. This has been measured, for instance, in the Casimir Effect, where it was shown the "empty space" is not in fact, empty and that quantum fluctuations are real. There have been various hoax claims of ways to harness zero-point energy but no known successes. Zero-point energy does not violate any laws of physics.
⚫
==Trivia==
  
  +
  +
==Related achievements ==
  +
  +
{{Achievement
  +
| icon =Hl2 get gravitygun.png
  +
| name =Zero-Point Energy
  +
| description=Get the Gravity Gun in [[Black Mesa East]].
  +
| value =5
  +
}}
  +
{{Achievement
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| icon =Hl2 beat ravenholm noweapons.png
  +
| name =Zombie Chopper
  +
| description=Play through [[Ravenholm]] using only the Gravity Gun.
  +
| value =25
  +
}}
  +
  ⚫
== Trivia==
  +
  ⚫
*The Gravity Gun was originally called the "Zero-Point Gun".<ref name="HL2Bp">Playable [[Half-Life 2 Beta|''Half-Life 2'' Beta]]</ref> In ''[[Episode Two]]'', the HUD calls it a "Zero-Point Energy Gun"
 
*The Gravity Gun appears to be quite heavy, as [[Alyx Vance]] and other characters that attempt to use the gun have some trouble lifting it. It also has significant recoil, as demonstrated when Alyx uses it to punt a door away. With his HEV suit, Gordon Freeman can use the device with ease.
  
*The Gravity Gun appears to be quite heavy, as [[Alyx Vance]] and other characters that attempt to use the gun have some trouble lifting it. It also has significant recoil, as demonstrated when Alyx uses it to punt a door away. With his HEV suit, Gordon Freeman can use the device with ease.
  +
*Alyx states that she found the Gravity Gun "handy for clearing minefields." She may be referring to [[Hopper Mine|Hopper Minefields]], such as the ones encountered in chapter [[Anticitizen One]]. However, punting Hopper mines does not actually do anything.
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*The Gravity Gun bears a vague resemblance to the [[Anti-Mass Spectrometer]] from ''[[Half-Life]]'', as well as a much more pronounced resemblance to the [[Aperture Science Handheld Portal Device|Portal Gun]] from the spinoff ''[[Portal]]''. The gun was actually seen inside a lab in [[Aperture Science Enrichment Center]] prior to [[GLaDOS]] killing its inhabitants.<ref name="P2LR">''[[Portal 2: Lab Rat]]''</ref>
  
  ⚫
*In ''Episode One'', during the sequence where the supercharged Gravity Gun is used, enemies killed by Alyx will still lose their weapons as if hit by the Gravity Gun. This is likely intentional, as the purpose of the Gravity Gun destroying enemy weapons is to prevent the player from taking them during the sequence.
−
*The supercharged Gravity Gun can be activated in normal use by entering the console command "physcannon_mega_enabled 1", which is now available in every ''Half-Life'' game that runs on The Orange Box engine (As of the May 26, 2010 update). As long as the player possess the supercharged Gravity Gun either from using the console commands or when exposed to the [[Confiscation Field]] in the [[Citadel]], any weapon used by the Combine will disintegrate.
  
  +
−
**If this console command is enabled, the NPC's weapon will disappear, even outside Citadel, regardless what weapon it is.
  
  ⚫
[[File:Aperture Science Gravity Gun.png|thumb|right|200px|As seen in the [[Aperture Science Enrichment Center]], in ''[[Portal 2: Lab Rat]]''.]]
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*When dying with the supercharged Gravity Gun, it disintegrates.
  
  +
⚫
*In ''Episode One'', during the sequence where the supercharged gravity gun is used, enemies killed [[Alyx's Gun|by]] Alyx will still lose their weapons as if hit by the gravity gun. This is likely intentional, as the purpose of the gravity gun destroying enemy weapons is to prevent the player from taking them during the sequence.
  
  ⚫
*The Gravity Gun bears a vague resemblance to the [[Anti-Mass Spectrometer]] from ''[[Half-Life]]'', as well as a much more pronounced resemblance to the [[Aperture Science Handheld Portal Device|Portal Gun]] from ''[[Portal]]''. The gun was actually seen inside a lab in [[Aperture Science Enrichment Center]] prior to [[GLaDOS]] killing its inhabitants.<ref name="P2LR">''[[Portal 2: Lab Rat]]''</ref>
⚫
*Using console commands or exploits, if the player picks up a [[APC|Combine APC]] or a [[Scout Car]] using the Dark Energy Gravity Gun, the game will either slow the framerate down dramatically, or crash the game. The muscle car should not be picked up due to faults in the physics engine<!-- Please don't use "spazz", it's not a very encyclopedic term :P -->.
  
  ⚫
*When the player dies wielding the supercharged Gravity Gun, it disintegrates.
−
*The Gravity Gun is present in ''[[Garry's Mod]]'' as a starting tool. However, it cannot be supercharged by any means. If the player enters a Confiscation Field, all weapons will be destroyed as normal, except the Gravity Gun which just sits on the ground. To get around this, the player can use several console commands which control the behavior of the weapon such as "physcannon_pullforce". These commands are native to the [[Source|Source engine]]; they can increase (or decrease) the power of the weapon to meet the supercharged version, however it still won't affect people. This might be intentional, as the supercharged Gravity Gun's skin is used by the [[Physgun]] or Physics Gun, a [[Half-Life 2 Beta|beta]] weapon resurrected in ''Garry's Mod'' as an integral tool.
  
  ⚫
*In the book "''The Areas of my Expertise''" by John Hodgman, the Gravity Gun was briefly mentioned while naming types of sword canes.
−
*The film ''[[Wikipedia:District 9|District 9]]'' features an alien weapon influenced by the Gravity Gun, built into a powered armor suit. It is able to pick up almost anything, including a pig, and hurl it with incredible force. It appears to have a much stronger field since it is able to stop bullets in flight, collecting and holding them just ahead of the muzzle, somewhat similar to a zero point energy field. It apparently also possesses some means of dictating the flight path of objects it launches, as it seen scattering a mass of bullets it has collected and simultaneously hitting several people standing in different positions around the room.
  
  +
*Using the developer console, the player can augment the Gravity Gun's power.
⚫
*When shooting any invincible NPC with the supercharged Gravity Gun the corpse spawns, but the NPC remains unaffected.
  
  +
**The supercharged Gravity Gun can be activated in normal use by entering the command "<code>physcannon_mega_enabled 1</code>". If this command is enabled, any NPC's weapon will disintegrate when they die, even outside the [[Citadel]], regardless of what weapon it is.
⚫
*The Gravity Gun was originally called the Zero-Point Gun.<ref name="HL2Bp">Playable [[Half-Life 2 Beta|''Half-Life 2'' Beta]]</ref>
  
  ⚫
**If the player picks up a [[APC|Combine APC]] or a [[Scout Car]] using the supercharged Gravity Gun, the game will either slow the framerate down dramatically or crash. The muscle car should not be picked up due to faults in the physics engine.
⚫
*In the book "The Areas of my Expertise" by John Hodgman, the Gravity Gun was briefly mentioned while naming types of sword canes.
  
  ⚫
**When attacking any invincible NPC with the supercharged Gravity Gun the corpse spawns, but the NPC remains unaffected.
−
*It appears that [[Aperture Science]] had a Zero-Point Energy Field Manipulator; one can be seen on a table in ''[[Portal 2: Lab Rat]]'' along with a [[charger]].
  
−
*In ''[[Half-Life 2: Episode Two|Episode 2]]'', the HUD calls it a "Zero-Point Energy Gun"
  
   
 
==Gallery==
  
==Gallery==
  +
===Models===
−
<gallery widths=140 position=center captionalign=center hideaddbutton=true><!--- DO NOT ALTER THESE CODES --->
  
  +
{{Gallery|
⚫
File:Eli proto physics.jpg|Concept art for the early "prototype physics manipulator" being held by Eli Maxwell.
  
  +
Gravity Gun.jpg {{!}} Worldmodel.
⚫
File:Gravity Gun hud icon.svg|HUD icon, a vector glyph used in-game through the font "HalfLife2.ttf".
  
  ⚫
Gravgun viewmodel.jpg {{!}} Viewmodel.
⚫
File:Gravity Gun.jpg|Worldmodel.
  
  ⚫
Gravity Gun hud icon.svg {{!}} HUD icon, a vector glyph used in-game through the font "HalfLife2.ttf".
⚫
File:Gravgun viewmodel.jpg|Viewmodel.
  
−
File:Gravity Gun super.jpg|Supercharged worldmodel.
 +
Gravity Gun super.jpg {{!}} Supercharged worldmodel.
−
File:Gravgun super viewmodel.jpg|Supercharged viewmodel.
 +
Gravgun super viewmodel.jpg {{!}} Supercharged viewmodel.
  +
Leaked 2002 Viewmodel.jpg {{!}} The Leaked 2002 Viewmodel of the Gravity gun.
−
File:Gravity gun first stored.jpg|The Gravity Gun stored in its cupboard at Black Mesa East.
  
  +
}}
⚫
File:Alyx gravity gun first buttons.jpg|Alyx opening the Gravity Gun's cupboard.
  
  +
===Screenshots===
−
File:Gravity_gun.jpg|Alyx showing Gordon the Gravity Gun.
  
  +
{{Gallery|
−
File:Alyx gravity gun first waiting.jpg|Alyx waiting for Gordon to take the Gravity Gun.
  
−
File:D3 citadel 030116.JPG|The Gravity Gun being transformed.
 +
Gravity gun first stored.jpg {{!}} The Gravity Gun stored in its cupboard at Black Mesa East.
−
File:D3 citadel 030166.JPG|Killing Combine soldiers with the transformed Gravity Gun.
 +
Alyx gravity gun first buttons.jpg {{!}} Alyx opening the Gravity Gun's cupboard.
  ⚫
Alyx gravity gun first waiting.jpg {{!}} Alyx waiting for Gordon to take the Gravity Gun.
⚫
File:Darkenergy.jpg|Holding an [[Energy Ball]] in front of Combine soldiers with the transformed Gravity Gun.
  
  +
D3 citadel 030166.JPG {{!}} Killing Combine soldiers with the transformed Gravity Gun.
⚫
File:D3 breen 010009.jpg|The Gravity Gun being taken away by an Overwatch Elite before [[Wallace Breen|Breen]]'s office.
  
  ⚫
Darkenergy.jpg {{!}} Holding an [[Energy Ball]] in front of Combine soldiers with the transformed Gravity Gun.
−
File:D3 breen 010000.jpg|The Gravity Gun being held by the Overwatch Elite.
  
  ⚫
D3 breen 010009.jpg {{!}} The Gravity Gun being taken away by an Overwatch Elite before [[Wallace Breen|Breen]]'s office.
⚫
File:D3 breen 0100225.JPG|Wallace Breen talking to an Advisor with the Gravity Gun on the floor.
  
−
File:Strider Buster held.jpg|Magnusson Device being held by the Gravity Gun.
 +
D3 breen 010000.jpg {{!}} The Gravity Gun being held by the Overwatch Elite.
  ⚫
D3 breen 0100225.JPG {{!}} Wallace Breen talking to an Advisor with the Gravity Gun on the floor.
⚫
File:Aperture Science Gravity Gun.png|The Gravity Gun in the [[Aperture Science Enrichment Center]], as seen in ''[[Portal 2: Lab Rat]]''.
  
  +
}}
⚫
</gallery>
  
   
−
==List of appearances==
 +
==List of appearances ==
 
{{Imagecat|Zero Point Energy Field Manipulator images}}
  
{{Imagecat|Zero Point Energy Field Manipulator images}}
   
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*''[[Half-Life 2: Episode Two]]''
  
*''[[Half-Life 2: Episode Two]]''
 
*''[[Portal]]'' {{Gf}} {{Nc}}
  
*''[[Portal]]'' {{Gf}} {{Nc}}
−
*''[[Portal 2: Lab Rat]]''
 +
*''[[Portal 2: Lab Rat]]'' {{Nc}}
−
*''[[The Final Hours of Portal 2]]''
 +
*''[[The Final Hours of Portal 2]]'' {{Nc}}
  +
*[[Garry's Mod]] (Non-[[canon]]ical appearance)
   
 
==References==
  
==References==
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{{Weapons}}
  
{{Weapons}}
−
{{Resistance}}
 +
{{Resistance}}[[de:Nullpunkt-Energiefeld-Manipulator]]
−  
−  
−
[[de:Nullpunkt-Energiefeld-Manipulator]]
  
 
[[es:Pistola antigravedad]]
  
[[es:Pistola antigravedad]]
  +
[[ru:Гравитационная_пушка]]
 
[[Category:Half-Life 2]]
  
[[Category:Half-Life 2]]
 
[[Category:Weapons]]
  
[[Category:Weapons]]
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[[Category:Gravity manipulators]]
  
[[Category:Gravity manipulators]]
 
[[Category:Experimental weapons]]
  
[[Category:Experimental weapons]]
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[[Category:Half-Life 2 weapons]]

Latest revision as of 00:07, 27 January 2023

This subject is from the Combine era.
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"The Zero Point Energy Field Manipulator is not a toy, Alyx!"
―Judith Mossman[src]
 

The Zero Point Energy Field Manipulator, commonly known as the Gravity Gun, is a tractor beam-type weapon designed for handling hazardous materials, but as Alyx Vance stated, primarily used for heavy lifting. At its core is a substance that appears to be a Xen crystal. Introduced to the player by Alyx Vance shortly after arrival at Black Mesa East, the Gravity Gun soon becomes a valuable tool in Gordon Freeman's arsenal. The Gravity Gun is considered one of Freeman's trademark weapons alongside his signature weapon, the crowbar.

Overview

The Gravity Gun has two modes. The primary fire releases an energy blast that punts the targeted object with tremendous force. The gravity gun is useful for clearing out barriers and moving heavy objects. The secondary fire picks items up and holds them just ahead of the gun. These objects can then either be dropped by pressing the secondary fire button a second time or punted with the primary fire. The secondary fire can only pick up lighter objects, mainly those which Gordon himself could carry, but the prime fire is capable of punting much larger things even if the secondary fire cannot affect them. The gun cannot affect most organic material, though there are a few exceptions, such as wood.

Alyx gravity gun first retrieving

Alyx introduces the Gravity Gun to Gordon at Black Mesa East.

The combination of the Gravity Gun's secondary and primary fire modes allow it to be used as a powerful weapon. Since it uses physics-based objects rather than conventional ammunition, there is virtually no limit to how many times it can be fired; however, this advantage is balanced by the need to "reload" after every shot by grabbing a new object.

Depending on the object fired, the gravity gun is potentially one of the most damaging weapons in the game. Heavier items like metal barrels and propane tanks can kill even Overwatch soldiers in a single hit conversely, things like plastic crates and wooden pallets will do very little damage due to their lesser mass. Explosive barrels, in particular, are a highly devastating weapon when combined with the gravity gun, but this has the potential to backfire if the enemy shoots the barrel while being held by the gravity gun.

The Gravity Gun is most effectively used as a short to mid-range weapon since the physics objects it uses for ammunition are affected by gravity. Because of this, the gravity gun is one of the most suitable weapons for Ravenholm before getting the shotgun, due to the large amounts of environmental props and the fact that ammunition is somewhat scarce there.

In addition to its use as a weapon, the secondary fire of the gun can be used to pull objects over from a distance, allowing Gordon to access supplies or other objects that would otherwise be out of reach. It can also be used to grab larger objects and hold them up as makeshift shields. Though normally unable to drag heavier objects, it proves capable of doing so in a select few areas, mainly as a way to create bridges. It should be noted that the secondary fire of the gravity gun does not automatically tractor in targeted objects. The object must be brought within a certain distance for the field to capture it, during which time it is still subject to gravity. The gun must also be constantly trained on the object to maintain the effect until it is captured.

Strider Buster held

Magnusson Device being held by the Gravity Gun.

In addition to its primary uses, the Gravity Gun can be used in more esoteric ways. Manhacks, City Scanners, and Shield Scanners can all be held and punted by the gun; the former, in particular, can be held by the gun for use as a makeshift chainsaw. All three are heavy enough to deal significant damage if punted and will be destroyed if punted into a nearby wall. However, if punted over greater distances, they will stabilize their flight. It can also be used to grab Hopper Mines and remove Rollermines from vehicles, holding them safely.

Hopper Mines grabbed in such a manner will automatically switch to recognize the player and their allies as friendly when planted again, while a Rollermine held with the gravity gun will be reprogrammed by Alyx, if she's around, to attack hostile targets instead of friendlies. Both types of mine can also be punted into enemies directly. Combine Sentry Guns can also be manipulated by the gun.

Though the gun cannot affect most organic matter, Headcrabs and Antlions are vulnerable to the primary fire. Three punts from the primary fire will kill any headcrab. Antlions are harder to kill in this manner, but being hit by the gun causes them to flip over, exposing their weaker undersides.

Dark Energy Field Manipulator (Super Gravity Gun)

D3 citadel 030116

The Gravity Gun being transformed.

When exposed to the Confiscation Field in the Citadel, the Gravity Gun is "supercharged" rather than being vaporized as other weapons are. It also shorts out the field in the process. Once supercharged, the Gravity Gun emits blue light rather than orange, quakes in Gordon's hands, and creates small bolts of energy across its muzzle. Its powers are vastly enhanced, enabling it to manipulate objects of far greater mass than it normally could as well as pull and repel them with greater force. Its most significant enhancement, however, is its ability to manipulate organic matter. Any Overwatch Soldier punted by it is instantly killed, and their body retains a charge that will kill others if it strikes them. If grabbed by the gun's secondary fire, they are likewise killed. It also has the side effect of vaporizing any weapons the soldiers were carrying.

The first time the Gravity Gun is supercharged is in Half-Life 2's twelfth chapter, Our Benefactors when Gordon's pod deposits him into a Confiscation Field and remains so until the end of the game. During this time, Citadel power chargers restore Gordon's health and boost energy to 200% as well. At the start of Episode One, it is no longer supercharged (yet the chargers keep the effect from the first game's citadel) but becomes charged again after Gordon and Alyx re-enter the Citadel to stabilize the core when Gordon accidentally enters another Confiscation Field. It remains supercharged until Gordon reactivates the core's containment field, at which point the Gravity Gun reverts to its normal state.

Behind the scenes

Eli proto physics

Concept art for the early "prototype physics manipulator" being held by Eli Maxwell.

  • As heard in sound files featured in the playable Half-Life 2 Beta files, Eli was to explain to Gordon at Black Mesa East that the Gravity Gun's "granddaddy" was used to manipulate hazardous materials in the Combine's portal reactors, suggesting the Gravity Gun uses Combine technology.[1]
  • Exactly how the Gravity Gun works is unknown, but some conclusions can be made. It is possible it uses a Xen crystal, as the emitter is almost identical to a sample being studied in Eli's lab in Black Mesa East. When the gun is supercharged by a Confiscation Field, Overwatch describes it as a "counter-resonant singularity device". Because of this, it probably contains negative mass or exotic mass. Negative mass is believed, by scientists, to have inverted gravity and repel normal mass instead of attracting it. The gravity gun may possibly control the gravity attribute of the crystal, making it able of both attracting and repelling objects. How the weapon should be able to concentrate the gravitational force at a single object is, however, unknown.
  • In physics, zero-point energy is a quantum mechanical phenomenon where the lowest of a system has non-zero energy. This has been measured, for instance, in the Casimir Effect, where it was shown the "empty space" is not in fact, empty and that quantum fluctuations are real. There have been various hoax claims of ways to harness zero-point energy but no known successes. Zero-point energy does not violate any laws of physics.

Related achievements

Hl2 get gravitygun
Zero-Point Energy 5 Gscore
Get the Gravity Gun in Black Mesa East.
Hl2 beat ravenholm noweapons
Zombie Chopper 25 Gscore
Play through Ravenholm using only the Gravity Gun.

Trivia

  • The Gravity Gun was originally called the "Zero-Point Gun".[2] In Episode Two, the HUD calls it a "Zero-Point Energy Gun"
  • The Gravity Gun appears to be quite heavy, as Alyx Vance and other characters that attempt to use the gun have some trouble lifting it. It also has significant recoil, as demonstrated when Alyx uses it to punt a door away. With his HEV suit, Gordon Freeman can use the device with ease.
  • Alyx states that she found the Gravity Gun "handy for clearing minefields." She may be referring to Hopper Minefields, such as the ones encountered in chapter Anticitizen One. However, punting Hopper mines does not actually do anything.
  • In Episode One, during the sequence where the supercharged Gravity Gun is used, enemies killed by Alyx will still lose their weapons as if hit by the Gravity Gun. This is likely intentional, as the purpose of the Gravity Gun destroying enemy weapons is to prevent the player from taking them during the sequence.
Aperture Science Gravity Gun

As seen in the Aperture Science Enrichment Center, in Portal 2: Lab Rat.

  • The Gravity Gun bears a vague resemblance to the Anti-Mass Spectrometer from Half-Life, as well as a much more pronounced resemblance to the Portal Gun from Portal. The gun was actually seen inside a lab in Aperture Science Enrichment Center prior to GLaDOS killing its inhabitants.[3]
  • When the player dies wielding the supercharged Gravity Gun, it disintegrates.
  • In the book "The Areas of my Expertise" by John Hodgman, the Gravity Gun was briefly mentioned while naming types of sword canes.
  • Using the developer console, the player can augment the Gravity Gun's power.
    • The supercharged Gravity Gun can be activated in normal use by entering the command "physcannon_mega_enabled 1". If this command is enabled, any NPC's weapon will disintegrate when they die, even outside the Citadel, regardless of what weapon it is.
    • If the player picks up a Combine APC or a Scout Car using the supercharged Gravity Gun, the game will either slow the framerate down dramatically or crash. The muscle car should not be picked up due to faults in the physics engine.
    • When attacking any invincible NPC with the supercharged Gravity Gun the corpse spawns, but the NPC remains unaffected.

Gallery

Models

Screenshots

List of appearances

Imagecat The Half-Life Wiki has more images related to Zero Point Energy Field Manipulator.

References

  1. ↑ Playable Half-Life 2 Beta files
  2. ↑ Playable Half-Life 2 Beta
  3. ↑ Portal 2: Lab Rat
Imagecat Weapons
Aperture Science Animal King • Bomb • Defective Turret • Frankenturret • Hover Turret (cut) • Oracle Turret • Rocket Sentry • Sentry Turret • Turret Opera
Black Mesa Barnacle Grapple • Crossbow • Ceiling Turret • Colt Python • Crowbar • Desert Eagle • Displacer Cannon • Glock 17 • Gluon Gun • Laser Tripmine • Mark IV Thermonuclear Device • Mk 2 Grenade • MP5 • Pipe Wrench • RPG • Satchel Charge • Spore Launcher • SPAS-12 • Tau Cannon
Black Ops Flash Grenade (cut) • Glock 17 • Laser Tripmine • M2 Browning Machine Gun • M249 Squad Automatic Weapon • M40A1 Sniper Rifle • Mk 2 Grenade • Mortar • MP5 • Sentry Gun
Combine AK-47 (cut) • Autogun • Ceiling Turret • Desert Launcher (cut) • Emplacement Gun • FIM-92 Stinger (cut) • Flare Gun • GR9 (cut) • Grenade • Ground Turret • Guard Gun (cut) • Headcrab Shell • Heavy Shotgun • HK-707 (cut) • Hopper Mine • Hopwire Grenade (cut) • Hunter-Chopper Bomb • Immolator (cut) • Incendiary Rifle (cut) • Jaytest (cut) • Laser Tripmine • Launcher (cut) • Manhack • MK3A2 Grenade • MP5K (cut) • MP7 • MP7 (cut) • Overwatch Sniper Rifle • Overwatch Standard Issue Pulse Rifle • Pulse Minigun • Pulse SMG • Pulse weapons • Rollermine • Sentry Gun • Shotgun • Sniper Rifle (cut) • SPAS-12 • Stun Baton • Suppression Device • USP Match • XM29 OICW (cut)
HECU Combat Knife • Desert Eagle • Dam Turret • Double Turret • Dynamite • Glock 17 • Land Mine • Laser Tripmine • M198 Howitzer • M2 Browning Machine Gun • M202A1 FLASH • M249 Squad Automatic Weapon • M40A1 Sniper Rifle • Minigun (cut) • Mk 2 Grenade • MP5 • RPG • Satchel Charge • Sentry Gun • SPAS-12
Resistance Alyx's Gun • Brickbat (cut) • Colt Python • Crossbow • Crowbar • Flare Gun (cut) • Ice Axe (cut) • Magnusson Device • Molotov Cocktail (cut) • Pheropods • Physgun (cut) • RPG • Ravenholm traps • Socket Wrench (cut) • Tau Cannon • Zero Point Energy Field Manipulator
Race X Shock Roach • Spore Launcher
Xen Black Hole Gun (cut) • Ceiling Turret • Grenade • Hivehand • Sentry Cannon • Snark • Snark Mine
Other Annabelle • AK-47 (cut) • AR3 • Harpoon (cut) • Magnet Gun (cut) • Penguin • Pulse Shield (cut) • Roller Wand (cut) • S.L.A.M • Sticky Launcher (cut) • Vortex Hopwire (cut) • Zero Point Generator (cut) • Weapons and items in Deathmatch Classic • Weapons cut from Half-Life 2
Imagecat The Resistance
Leaders / key members Barney Calhoun • Odessa Cubbage • Gordon Freeman • Isaac Kleiner • Arne Magnusson • Eli Maxwell (cut) • Helena Mossman (cut) • Judith Mossman • Odell (cut) • Russell • Vance (cut) • Alyx Vance • Eli Vance
Minor members All-Knowing Vortigaunt • Animal (cut) • Consoling Couple • Dog • Father Grigori • Griggs • Johanson (cut) • Lamarr • Laszlo • Leon • Mambridge (cut) • MIRT • Nigel (cut) • Olga • Peters (cut) • Sandy • Sheckley • Skitch (cut) • Unidentified deaf character (cut) • Uriah • Victory Mine Vortigaunt
Weapons Alyx's Gun • Brickbat (cut) • Colt Python • Crossbow • Crowbar • Flare Gun (cut) • Ice Axe (cut) • Magnusson Device • Molotov Cocktail (cut) • Pheropods • Physgun (cut) • RPG • Ravenholm traps • Tau Cannon • Zero Point Energy Field Manipulator • Socket Wrench (cut)
Vehicles Airboat • Borealis (cut) • C-130 (cut) • Jet Ski (cut) • Jalopy (cut) • Mil Mi-8 • Muscle Car • Scout Car • Submarine (cut) • V-22 Osprey (cut)
Technology Car battery • Communication • Antlion Detector • Dog • EMP Tool • Fire Extinguisher (cut) • Generator trailer • Drawbridge • Retinal scanner • Supply Crate • Teleportation • Television • Transponder • White Forest rocket
Locations Black Mesa East • Bridge Point • Dock 137 • Kleiner's Lab • Lighthouse Point • New Little Odessa • Radio Tower • Ravenholm • Shorepoint Base • Station 1 • Station 6 • Station 7 • Station 8 • Station 9 • Station 12 • Station 21 • Underground Railroad • Victory Mine • Vortigaunt Camp • White Forest • The White Forest Inn • See cut locations
Other Conscripts (cut) • Lambda logo • Vortigaunt • Vance (cut) • Citizen • Children • Lamarr
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