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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