Editing UDMF (section)

===Explanation of fields===
*'''offsetx''', '''offsety'''
:Overall horizontal and vertical offsets for the top, middle, and bottom textures of this sidedef.
*'''offsetx_top''', '''offsety_top''', '''offsetx_mid''', '''offsety_mid''', '''offsetx_bottom''', '''offsety_bottom'''
:Horizontal and vertical offsets for the individual top, middle, and bottom portions of this sidedef.
*'''light''', '''light_top''', '''light_mid''', '''light_bottom''', '''lightabsolute''', '''lightabsolute_top''', '''lightabsolute_mid''', '''lightabsolute_bottom'''
:Brightness for the whole, and the individual top, middle, and bottom portions of this sidedef. By default the values are additive to the inherited brightness. If the "absolute" properties are set to "true" the values are not additive anymore, but absolute.
*'''skew_top_type''', '''skew_bottom_type''', '''skew_middle_type'''
:The type of skewing that the a given texture of this sidedef has. This skew starts at the left side of the sidedef (if viewing the sidedef straight-on) and conforms to either the slope on the front or back side of the line the sidedef is on. Either the floor or ceiling slope can be picked as the slope for the skewing to conform to. Values are "none", "front_floor", "front_ceiling", "back_floor", and "back_ceiling", with "none" being the default.