Editing UDMF (section)

==Linedefs==
 linedef
 {
   blocklandmonsters = <boolean>;
   blockplayers = <boolean>;
 
   polycross = <boolean>;
   monstershoot = <boolean>;
 
   midtex3d = <boolean>;
   firstsideonly = <boolean>;
   blockeverything = <boolean>;
   zoneboundary = <boolean>;
   clipmidtex = <boolean>;
   midtex3dimpassible = <boolean>;
   lowerportal = <boolean>;
   upperportal = <boolean>;
 
   portal = <integer>;
 
   alpha = <floating-point>;        // default 1.0
   renderstyle = <string>;
   tranmap = <string>;
 }
===Explanation of fields===
*'''blocklandmonsters'''
:If true, linedef blocks walking monsters but allows fliers to pass. Players can pass anyway.
*'''blockplayers'''
:If true, linedef blocks players but allows monsters and projectiles to pass.
*'''polycross'''
:If true, linedef is activated when a polyobject's center point crosses it.
*'''monstershoot'''
:If true, linedef is activated when a monster fires hitscan on it.
*'''midtex3d'''
:If true, this linedef's middle texture uses [[3DMidTex_tutorial|3dmidtex]] physics.
*'''firstsideonly'''
:Linedef can only be activated from front side.
*'''blockeverything'''
:Linedef blocks all objects, acting like an external solid wall
*'''zoneboundary'''
:Linedef acts like a boundary for [[EDF_sound_reference#Sound_environments|reverb]] effects.
*'''clipmidtex'''
:Middle texture is clipped against the floor or ceiling as if a light change took place.
*'''midtex3dimpassible'''
:Treat the 3dmidtex line as a classic impassable middle texture, with regards to projectiles (i.e. they will pass through, just like hitscans).
*'''lowerportal''', '''upperportal'''
:Apply [[edge portals|edge portal]] on the lower or upper part of this linedef, copying back sector's floor or ceiling portal into it.
*'''portal'''
:The ID of the portal to apply on this linedef, as defined from [[Portal_Define]]
*'''alpha''' (default: 1.0)
:Opacity of this line.
*'''renderstyle'''
:Either "translucent" or "add". Default is "".
*'''tranmap'''
:Boom [[translucency map]]. Mutually exclusive with alpha and renderstyle.