Knowledge Base - Mirror
When I first played Duke Nukem, one of the things that really caught my eye was the mirrors that were in the first level. The mirrors added a nice touch of realism, especially in the bathroom of the movie theater. Now, it is possible to have mirrors in Doom. The wad mirror.wad has the sample mirror.
The mirror special (182) does not take any parameters.
Making mirrors is simplicity itself. Make sure that behind the mirror is a void area equal to the area of the sector that has the mirror, or the mirror will not display correctly.
That is all there is to it. Making mirrors couldn't be easier and adds a nice touch to any level.