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Portal rendering with Bsp-Trees

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Hi everyone...i''m coding a 3d engine that use portal rendering with bsp-trees and i would like to now if anyone knows any good tutorials about this matter. Your tips are welcome. Thanks.

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Several ways.

1) You can download the Quake I engine and see how they rendered their map.

2) A man known as "botman" within the Half-Life development community has created a program called BSP Viewer, which can load and view Half-Life BSP files independently, using visibility information, lightmaps, textures and everything. Download the source:
http://www.fileplanet.com/dl/dl.asp?planethalflife/botman/BSP_tool_src_0_3b.zip

It''s a complete BSP Viewer/Engine, just without the game behind it.

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