Re: [stella] Wolfenstein 5K

Subject: Re: [stella] Wolfenstein 5K
From: Greg Miller <gmiller@xxxxxxxxxxxxxxxxx>
Date: Sun, 21 Jul 2002 22:59:08 -0600
Clay Halliwell wrote:

----- Original Message ----- From: "Greg Miller" <gmiller@xxxxxxxxxxxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Sunday, July 21, 2002 1:17 AM
Subject: Re: [stella] Wolfenstein 5K

Building the equivalent of Doom with raycasting (instead of the polygon renderer that the original used) would be extremely difficult, anyway.

There is not a single polygon in Doom. It's all raycasting.

Doom uses a 2D BSP tree to order polygons from back to front. In order to avoid perspective correct overhead, they ensured that every polygon would have a line of constant Z along either the X axis or the Y axis, with separate polygon rasterizers for each case.

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