[[File:Adhesion Gel 2.jpg|right|300px|Adhesion Gel in-game]]
[[File:Adhesion Gel 2.jpg|right|300px|Adhesion Gel in-game]]
'''Adhesion Gel''' was a [[gel]] type that was cut from ''[[Portal 2]]''. It did not function and was replaced by [[Reflection Gel]] in the [[Peer Review]] DLC.
'''Adhesion Gel''' was a [[gel]] type that was cut from ''[[Portal 2]]''. It did not function and was replaced by [[Reflection Gel]] in the [[Peer Review]] DLC.
== Function ==
== Function ==
Adhesion Gel can be "painted" onto surfaces like any other gel. Originally, the gel was supposed to allow the player to walk on the walls and ceiling of test chambers. However, this effect has been removed in the final game. Objects can be coated in Adhesion Gel, but there are no Adhesion Gel-coated textures for anything, so it will not render. The only remaining effect of Adhesion Gel is that objects coated in it will not slide along [[Propulsion Gel]], and vice-versa. The gel was made purple as a placeholder; a final color was never decided on, so it remains purple in the final game.
Adhesion Gel can be "painted" onto surfaces like any other gel. Originally, the gel was supposed to allow the player to walk on the walls and ceiling of test chambers. However, this effect has been removed in the final game. Objects can be coated in Adhesion Gel, but there are no Adhesion Gel-coated textures for anything, so it will not render. The only remaining effect of Adhesion Gel is that objects coated in it will not slide along [[Propulsion Gel]], and vice-versa. The gel was made purple as a placeholder; a final color was never decided on, so it remains purple in the final game.
== Problems ==
== Problems ==
According to the ''Portal 2'' developer commentary and [[The Final Hours of Portal 2]], play testers were falsely disoriented when they had to think with portals while walking on walls and ceilings, and the gel did not work correctly with portals. Valve had ultimately scrapped the gel as a result.
According to the ''Portal 2'' developer commentary and [[The Final Hours of Portal 2]], play testers were too disoriented when they had to think with portals while walking on walls and ceilings. Valve had ultimately scrapped the gel as a result.
Adhesion Gel was later replaced by [[Reflection Gel]] in the [[Peer Review]] DLC, which uses the same color as [[Conversion Gel]]. The updated gel is still not used in the game, but it is functional to redirect lasers if placed using the [[Portal 2 Authoring Tools]].
Adhesion Gel was later replaced by [[Reflection Gel]] in the [[Peer Review]] DLC, which uses the same color as [[Conversion Gel]]. The updated gel is still not used in the game, but it is functional to redirect lasers if placed using the [[Portal 2 Authoring Tools]].
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== Reimplementation in community maps ==
== Reimplementation in community maps ==
Because Adhesion Gel still partially exists in the game along with a signage texture, several community map makers have attempted to reimplement the gel using standard entities and scripts. Several other mapmakers have also created their own Adhesion Gel implementations, though most of these have not been released or no longer function.
Because Adhesion Gel still partially exists in the game along with a signage texture, several community map makers have attempted to reimplement the gel using standard entities and scripts. Most of these involve tricks with rotating the entire map around the player, while making sure physics objects like cubes still fall towards the actual floor. One example of such a map that has been publicly released is Prototype's [https://steamcommunity.com/sharedfiles/filedetails/?id=860192232 Adhesion series]. Several other mapmakers have also created their own Adhesion Gel implementations, though most of these have not been released or no longer function.
=== Examples an/or workarounds ===
* Rotating the entire map around the player, while making sure physics objects like cubes still fall towards the actual floor. One example of such a map that has been publicly released is Prototype's [https://steamcommunity.com/sharedfiles/filedetails/?id=860192232 Adhesion series].
* Literally ''stick'' the player into the floor.
* Camera angle manipulation, with using the ''stick'' workaround
== Videos ==
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== Trivia ==
== Trivia ==
* The Adhesion Gel was based on the blue "stick" paint in ''[[Tag: The Power of Paint]]'', the game which ''Portal 2''<nowiki>'</nowiki>s gel mechanics are based on.
*The Adhesion Gel was based on the blue "stick" paint in ''[[Tag: The Power of Paint]]'', the game which ''Portal 2''<nowiki>'</nowiki>s gel mechanics are based on.
* While the properties of the gel is sticky. In some maps, jumping off (default key {{Key|space}}) the gel will not disengage the player from the ''sticky'' state. This glitch can be observed and practiced in some maps where the workaround is rotating the entire map.
Adhesion Gel can be "painted" onto surfaces like any other gel. Originally, the gel was supposed to allow the player to walk on the walls and ceiling of test chambers. However, this effect has been removed in the final game. Objects can be coated in Adhesion Gel, but there are no Adhesion Gel-coated textures for anything, so it will not render. The only remaining effect of Adhesion Gel is that objects coated in it will not slide along Propulsion Gel, and vice-versa. The gel was made purple as a placeholder; a final color was never decided on, so it remains purple in the final game.
Problems
According to the Portal 2 developer commentary and The Final Hours of Portal 2, play testers were falsely disoriented when they had to think with portals while walking on walls and ceilings, and the gel did not work correctly with portals. Valve had ultimately scrapped the gel as a result.
Because Adhesion Gel still partially exists in the game along with a signage texture, several community map makers have attempted to reimplement the gel using standard entities and scripts. Several other mapmakers have also created their own Adhesion Gel implementations, though most of these have not been released or no longer function.
Examples an/or workarounds
Rotating the entire map around the player, while making sure physics objects like cubes still fall towards the actual floor. One example of such a map that has been publicly released is Prototype's Adhesion series.
Literally stick the player into the floor.
Camera angle manipulation, with using the stick workaround
The Adhesion Gel was based on the blue "stick" paint in Tag: The Power of Paint, the game which Portal 2's gel mechanics are based on.
While the properties of the gel is sticky. In some maps, jumping off (default key space) the gel will not disengage the player from the sticky state. This glitch can be observed and practiced in some maps where the workaround is rotating the entire map.
