A1 Sector Over Sector

Sector Over Sector makes it possible to fake things such as multi-story buildings. It has limitations though. Sometimes bugs will also occur with this effect.

I will begin by using an example. Create the following sector. This sector will be known as the "lower level".

Now create a hallway attached to the lower level. Leave a gap between the end of the hallway and the lower level.

Create a new sector. This will be known as the "top level". Make sure the lower level and top level share no vertices! Notice how the top level's and lower level's lines cross. This is allowed in the Sector Over Sector effect. Change the shape of the top level so it looks different from the lower level.

Now place the white arrow in the lower level and enter 3D mode. Walk through the hallway to the top level. Notice how it seems like you've just walked right back into the lower level, except it looks different. That's because you are now in the top level! How does that work? There are a few simple rules in creating the Sector Over Sector effect.

  1. The two sectors cannot share any vertices. They cannot be connected in any way. The sectors must be completely independant of each other. You can, however, cross their lines (walls). Crossing lines may cause glitches though.
  2. The two sectors cannot be seen at the same time by one player. Doing so will cause glitches in either sector. Make your hallway long enough so that the player will not be able to see both sectors at the same time. Note: This also means you cannot create a building with top and lower level windows which can be seen through at the same time.

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