Doom engine: room-over-room is not possible. This limitation, however, has a silver lining: a "map mode" can be easily displayed, which represents the walls and the player's position, much like the first image to the right.

Basic objects

The base unit is the vertex, which represents a single 2D point. Vertices (or "vertexes" as they are referred to internally) are then joined to form lines, known

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