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Directional Effects are level specials that force the player in a certain direction, such as wind and water currents. They are quite common, and can be seen in many SRB2 levels, such as Sapphire Falls Zone. Specials that consist of directional effects are often set up in the same fashion, mainly by setting the effect to a linedef that has the right length and direction, tagging it to a sector, and then optionally scroll the flats.
The below is a tutorial telling how to set up a typical directional effect.
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The first step to making any sort of directional effect is knowing how to find the angle of a linedef. For instance, a horizontal linedef on the map must go either east to west, or west to east. Likewise, a vertical linedef goes either north to south or south to north.
To find out, you can use one of two methods below. The first method is very easy.
The first method is easier, while the second is better for enclosed linedefs.
After finding the angle of the linedef, setting up the effect itself is actually pretty routine. For most directional effects, you would do the same thing. The only thing that's different is the special effect that is used. For this procedure, we'll make a water current, though for other specials it's largely the same. Know the basics before trying this out!
All directional effects are linedef specials. There are several, including currents and texture scrollers. Below are some of the more common ones:
Also know that current and wind, as well as conveyor belts, require that the target sector have a sector special applied to it. Use Wind/Current with the Wind or Current effects, and use Conveyor Belt when making conveyor belts with the appropriate special (see "Scroll Effects").