Free direction tunnel tutorial by Blackaxe of Kolor /code/effects/tunnel/fdtunnel.zip	30 Jun 1998 (catalog date) 4,008 bytes
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A good tutorial about coding free direction tunnels using the realtime raytracing method. Text

Free direction tunnel tutorial by Kombat /code/effects/tunnel/freedir.zip	30 Jun 1998 (catalog date) 48,954 bytes
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Basicaly the same info as can be found in fdtunnel.zip by Blackaxe of Kolor. Text, C