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== Some things to watch out for == === Holes in your structures === Each structure needs to be closed enough to support the objects running over it. That is, the lines need to be close enough together so that an object can't slip through the gaps. [[Image:3dmidtex_tut3.jpg]] === Clipping === It is important to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is. 3DMidTex lines will only block objects and not bullets. So a 3DMidTex will stop a rocket but not a shotgun blast. Also, please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. === 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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