How do you add a thok barrier to a level?

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Umm, no. You make another sector that wraps around the level as best as you can, then make the floor and ceiling height the same for that sector. Mikesword's way not only doesn't work properly, it causes glitches throughout the whole level.
 
Why don't you see the wiki?
Guide:
1:make your level basic form

2:After...you make behind the map(not too far)The same map following by the basic form

3:Switch to sectors mode and select both sectors(Sector 2(if you make the basic form(1st sector)and make the thok barrier))

4:Put the ceiling height and the floor height 128

5:Select the 1st sector propieties(not 1st and 2nd sector!)

6:Put the ceiling height at any height and the floor one 0

7:Close the 1st sector propieties and elect linedefs mode

8:See the ^ arrow?click on it(if you have it already up,skip this)

9:Now see the linedefs,scroll over them and search meanwhile you touch with your mouse the linedef something that says''missing texture''that will make the map screw up...click in it

10:Click in the gfz texture if you want to make a GFZ-based level...if not...press tab...you will see all the game textures

11(if you followed the tab part):select a texture to put to the wall

And thats how the thok barrier is maked!!!!


But even...my message explains more
 
http://www.srb2wiki.sepwich.com/wiki/Thok_Barrier

I don't know if you've read it before, but here ya go anyway. Just keep in mind that in the future, make the thok barrier first, before anything. Adding a thok barrier removes all your textures and makes it so you have to retexture all the walls. Basically, if starting a level make a big sector and build your level inside it.
 
A thok barrier is just a sector on the edge of the map with the same floor and ceiling height. The choice of 128 for that height is entirely arbitrary.
 
GemEarthBrandon said:
A thok barrier should be the first sector you draw.
That's actually not entirely true. That is, by far, the easiest way to do it, but if you're doing a stage where you want to have a variety of wall heights for the thok barrier, it may be easier to add it later. Aerial Garden, for instance, has the thok barrier added last to make it easier, since there are so many different types of walls I want to make on the edge of the stage.
 
Either way works, really. Personally you can just make the stage like a generic Doom stage (one-sided linedefs on the edges of the world, in "holes" in the level where paths split, etc.), and, at the end, create one giant box around it. In Doom Builder this also will plug any existing holes into your thok barrier, for better or worse.

From there, just make it so the thok barrier keeps to the layout of your level as closely as possible (as giant box thok barriers have been known to produce graphical errors) - if you find an indent in the level which the box glosses over, insert a few linedefs there so that the thok barrier has the indent in there as well. This adds one-sided linedefs, too, which are required to prevent major slowdown in the stage (it tells the renderer where to stop - otherwise, it can potentially attempt to go through the entire stage, which, depending on the length, can cause graphical errors).
 
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