Editing Polyobject (section)

==Polyobjects with 2-sided lines==
Polyobjects made of 2-sided lines have always worked in all games which had polyobjects, but with limitations. Keep in mind that Polyobj_StartLine only works for closed polygons of linedefs going the same way. Otherwise, use Polyobj_ExplicitLine for all involved lines. You will need to use an OPEN [[ACS]] script with the [[SetLineSpecial]] and [[SetLineActivation]] if you want lines with Polyobj_ExplicitLine to have in-game activation effects. In Eternity, a polyobject can have any number of one-sided and two-sided lines.

As of Eternity 4.06.00, the following improvements have been made to 2-sided lines belonging to polyobjects:
# Passable lines no longer push things standing in their way, if they can just move into them (normally in Hexen they would push). Pushing will only happen on the category of solid things affected by the specific blocking type (monsters, players or both)
# Textures will retain their initial Y offset when the line moves across different sector elevations. Previously in Hexen they would always make sure the Y offset agrees to the current sectors where they're located.
# No more collision detection influenced by the source control sector. Previously in Hexen you would need to match the height of the control sector with the one of the game sector. Normally this wasn't an issue, because of the subsector restriction, which no longer exists in Eternity.
# 2-sided lines with actions will also trigger if actor stands still and is crossed by the polyobject.
# 3DMidTex lines now work properly and as expected. You can use them as horizontal moving platforms.
# Impassable 2-sided lines also behave as transporters to things above if moving below sector portals.

[[category:Editing reference]]