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3DMidTex tutorial
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=== Monsters crossing === Because of the way monster AI in Doom works, it can be VERY tricky to get monsters to cross a 3D bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line, because the engine assumes there is nothing on the other side for the monster to step on. Here are some tips to help you overcome this. When a monster comes in contact with a 3DMidTex line that it can stand on (i.e., is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way is to ensure that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3DMidTex line inside the niche you just created. [[Image:3dmidtex_tut4.jpg]] Now monsters are much more likely to cross your bridge. Another thing to note is that monsters have no idea which line is the edge of the 3D bridge, and will hang off the edges. They won't fall down, so don't worry, but it just looks bad. One remedy is to make the outer edges monster impassible. When the 3DMidTex flag and this are used in conjunction, monsters will be blocked when they try to cross on top of that 3DMidTex; however, they won't be blocked by going under it. Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.
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