6. Features of the Engine

• Texture Mapped Environment - Unlike in earlier games, textures are painted on walls, which makes them more realistic. The Doom Engine's texture mapping is fast, accurate, and seamless.
• Non-Orthogonal Walls - In Wolfenstein 3D, walls were always at right angles to each other. But in Doom sectors can be of any shape, and this allows for a very realistic look.
• Light Diminishing and Light Sourcing - Doom's lighting is sector-based. Lighting is also realistic and adds depth because farther areas appear dimmer than nearer ones.
• Variable Floor and Ceiling Heights
• Environment animation - Parts of the environment can be animated, for example lights can glow on and off, etc.
• Multiplayer - Doom can be played over a network or over a modem.

The gameplay of Doom is frightening and a lot of fun. It's sheer speed gives immense enjoyment to the player.

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