Changes

The '''automap''' is a map displayed when the user presses the tab key. As all levels in Doom are [[Doom rendering engine|flat when viewed from above this ]], generation of such a map is a relatively easy task, (as compared to later games which were had true 3D and so engines, thus making it difficult to render a map automatically for).

The map shows all [[segs]] (segments of [[wall]]) the player has seensince entering the level. Therefore , while it is possible to walk around with the in automap function turned onmode, the map itself will not update: the lines shown in the map are marked by the rendering process, which does not occur while the automap is turned on. As the Doom instruction manual notes, playing in automap mode is a dubious long-term strategy, since [[monsters]] cannot be seen.

The lines in the automap are color-coded. Red indicates a lines indicate solid wallwalls. Yellow indicates a change lines indicate changes in ceiling height (e.g. a doordoors). Brown indicates a change lines indicate changes in floor height. Light grey indicates an area lines indicate areas which has have not yet been visited (made visible by the [[computer map]] powerup).

Lines During the design of a level, lines can be flagged by the authors of levels so as not to appear on the automap. Such lines are not displayed even if the [[computer map]] powerup is picked upobtained. However, the IDDT <tt>iddt</tt> [[cheat code]] will display all lines.

To avoid giving away [[secrets]], secret concealed doors can also be marked so as to initially appear red on the map like a , as though they were solid wallwalls.

* F: Toggles follow mode; if follow mode is on, the map follows the player, otherwise and if not, it is possible to browse around the map freely using the arrow keys.* M: Marks the current position with a flag. (In [[Doom95]], this function is extremely buggy and may even cause the program to crash.)* C: Clears all marked positions.* G: Toggles grid on/off.* +: Zooms in.* -: Zooms out.* 0: Zooms out fully.* Tab: Exits automap and returns to normal view.

The IDDT <tt>iddt</tt> [[cheat code]] can be used to display all items on the map. Zooming in closely on the player while this is active shows the letters "ddt", a reference to [[Dave Taylor]] who wrote the automap code.