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of research, here's the definitive answer! For more information on how the Doom Engine works, here's a very good run-down of what the source code is doing behind the scenes: http://fabiensanglard.net/doomIphone/doomClassicRenderer.php ------------------------------------------ Additional Information and Corrections: * I couldn't think of a good way to demonstrate most of what I was talking about, as it can be difficult to intentionally create some of the potential issues the engine can run into. Fortunately, I stumbled across one just looking through random Doom levels with Doom Builder 2. Easy to see how it was missed too given all the textures in that area were primarily red. :B ------------------------------------------ Pixelmusement Website: http://www.pixelships.com ADG on Pixelmusement: http://www.pixelships.com/adg Alphabetical Index of ADG Episodes: http://www.pixelships.com/adg/index2.html