Linedef type 313
Linedef type 313, No More Enemies – Once, is a type of linedef executor trigger which activates any linedef executor in the control sector once no more enemies (bosses included) exist within a specified area. The linedef executor will trigger only the first time, and then will not be triggered again until the map is reloaded. This effect is useful for creating areas where the player has to destroy all enemies to move on.
This trigger uses invisible, intangible FOFs (linedef type 223) to specify the area that is checked for enemies; it is only activated when no more Objects with the flag
MF_BOSS exist inside these FOFs.
Create a control sector outside of your map and give as many linedefs as you wish linedef type 223, and tag each one to a target sector you want to be scanned for the presence of enemies. Give this control sector an unused tag. Next, create another control sector and give one of its linedefs linedef type 313. Give this linedef the same tag as the control sector for the invisible, intangible FOFs. Any linedef executor effect you would like to be triggered should be applied to other linedefs on the control sector with linedef type 313. The game will go through the linedefs of the FOF control sector, checking inside the areas occupied by the FOFs to see if any enemies exist. The floor height and ceiling height of the FOF control sector indicate the floor and ceiling heights of the FOFs. If no enemies exist in any of the FOF areas, this linedef executor is run once.
- Example file: ex_ld313_trigger_nomoreenemiesonce.wad (MAP01)
- Play this map in Single Player mode.
|How to use|