Editing 3DMidTex tutorial (section)

== Your first 3D bridge ==

For the purposes of this tutorial, I'll assume you are familiar with Doom editing and your level editor, and with the use of middle textures. You will need to use an editor that either has support for Eternity features (e.g. [[Doom wiki:Doom Builder|Doom Builder]]) or an editor that allows you to manually change the flags value for linedefs.

First, open up a new Doom 2 level for editing, and create a simple room with a pit running through it.

[[Image:3dmidtex_tut1.jpg]]

(I added cool, ultra-hurty lava to mine)

Now you need to create the structure the player will eventually be able to cross to get to safety. Again, I assume you know how to create two sided lines and place and align middle textures in them.

[[Image:3dmidtex_tut2.jpg]]

If you run this map, the player obviously falls down through your middle texture bridge. So we perform the final step: setting the lindef flag. The flag is 1024 (0x400 in HEX), so if you are editing the flags yourself, just add 1024 to your flag value; if you are using Doom Builder, and you don't see the lindef flag called "3dMidTex", press F2 and make sure you are editing your map as an Eternity map. Once your flags are set for your linedefs, run the map, and the player should now be able to cross the bridge as if the middle textures were solid objects.