Start doomedit and make a medium
sized room and draw a brush lengthwise
in middle of the room(while it's still selected)than right click on
grid then select trigger-->trigger_once.
This will automatically apply the trigger_once texture
and make the trigger properly.
Then right click on the grid and select info-->info_playerstart then pull it
down to ground.You now need 2 things a light and a
target_setinfluence.First right click on the grid and select light and put it
where you want in the room then press "n" to go to light's properties then
add the key "color_demonic",for value ".5 0 0" and press enter.Right click on
the grid and select target-->target_setinfluence.And go to its properties and
add key "time",for value "enter number of seconds for the effect to last" and
press enter.Then add key "radius",for value "example:400 this is the radius
of effect and the light must be in the radius of target_setinfluence".In
addition to all of this we can add key "fade_time",for value ".5" this fades
the screen to this color(default is 0.75).First select the trigger then select
target_setinfluence and press "ctrl+k".Now trigger is connected with
target_setinfluence.Save your map.Go to bsp and wait for compiling then
start your map and step onto trigger.
