Portal Glitch Prevention: Difference between revisions

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#REDIRECT [[Exploits#Water]]
====Portal Bumping====
[[Image:PortalBumping.png|thumb|200px|right|An example of Portal Bumping]]
If the player shoots a Portal at the corner of the other Portal, it is sometimes possible to "bump" the second Portal up to 32 units through walls and other objects, to get the second Portal in a place that should be impossible. This glitch works on Valve's maps.
 
''How to Fix:''
Place func_portal_bumpers around the edges of things like cleansers, and a func_noportal_volume as well.
The screenshot demonstrates portal bumping on the last level of Portal. Portal bumping here allows you to really mess with the game. This is why it is so important to fix this.
 
{{note|nubSawace is credited for spreading knowledge of this bug; his video demonstration of the bug is available [[http://www.youtube.com/watch?v=HNEaYCXpvXs here]]}}
{{clr}}
 
====Going Behind Portals====
Avoid 1 unit thick walls. Players can abuse these and get behind them{{how?}}, although it is very difficult.
 
====Edge Hopping====
This works on one of Valve's maps. Make sure your metal walls, especially if they are detailed with some blocks sticking out, cannot be traversed.
 
==Other design considerations==
The following issues are not glitches in the sense of programming errors, but if not carefully considered by the mapper, they can be abused to circumvent parts of a puzzle and complete it in unintended ways. It is not necessarily mandatory to prevent all of these problems; you can always choose to embrace creative ways to complete your puzzles, and factor them into the Gold requirements for the Challenges for your map.
 
===="Portal-through-portal" AKA "portal standing"====
A varation of the "peek-a-portal" technique, Portal standing lets a player use a Portal as a ledge, allowing the player to continue moving by shooting additional Portals.
Peek-a-portal is required to obtain a Gold for the Least Portals challenge on Test Chamber 15.
 
====Item climbing====
If your map contains physics props (such as chairs, cameras, etc), the player can collect these and climb them to get to higher areas. Not much you can do about this unless you have invisible blocking brushes to block areas the player shouldn't be able to get to yet.
Item climbing is required to obtain a Gold for the Least Portals challenge on Test Chamber 17.
 
====Infinite loop====
Watch out if your room has a portalable surface on the floor, with another on a higher section of floor, or for portalable ceiling over portalable floor. The player can abuse these to gain momentum to perform a fling. Some players have circumvented entire challenges in seconds using fling.
These techniques are required to obtain a Gold for the Least Time challenge on Test Chamber 14.
 
[[Image:JumpFromButton.jpg|thumb|200px|right|Here, the player can jump from the button to the ledge, bypassing the intended solution]]
 
====Jumping off switches and other things====
Players can jump onto switches and railings. Ensure they cannot jump off of these to get somewhere unintended.
 
====Portalable hallways with triggers====
When building hallways with triggers, make sure that the player can't portal past the triggers.
 
====trigger_looks====
Always have a backup trigger in case the [[trigger_look]] doesn't get looked at. (where applicable)
 
====Unintended shields====
Make sure that turret-related areas don't have any unintended shields. If the player has access to a dead turret that could be used to shield, and circumvent part of the map (eg. getting a box) find a place to put a cleanser to kill the turret, or make the turret Fizzle out when dead.
 
====Seal the bottom of Goo Pits!====
Seal the bottom of goo pits properly. It doesn't kill instantly. Depending on the layout of your map someone may be able to get outside of or on top of it from here, and re-enter later.
Also, make sure portals cannot be placed in goo pits, because goo doesn't go through portals and if you look under goo through a portal everything will be black.
 
====Placing portals behind objects====
 
This glitch shouldn't affect the gameplay itself, but will make your map look bad. It happens when a portal is placed too close to an object, a switch, for example, and the object will float on the portal. To avoid this, just make a brush 4 units tall, a little bit thicker and wider than the object that is affected from the glitch. Then, place the object on the new brush, group them, and place them where  your switch/button or everything else should be. Now the glitch is fixed without any noportal/portalbumper surface.
 
== See also ==
* [[Portal Level Creation]]
 
[[Category:Level Design Tutorials]]
[[Category:Portal]]

Revision as of 22:20, 9 August 2018

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