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My Commander Keen games will take place in full 3D environments. How
will I go about creating these 3D environments? Well, have you ever
heard of a technique known as "Portal Rendering"? Try to
think of portal rendering in real world terms - in a room you have
doors and windows. You can see through these doors but nothing
behind the walls. Portal rendering works out exactly what you can
and can't see on the fly - there is no need for pre-compiled data
like BSP trees (used in games like Doom 1 & 2 and Quake - Doom 3
will be using portal rendering to determine what can and can't be
seen).
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