Useful sites

TWHL - The Whole Half Life

Is the only site you will ever need! This web site is probably the most active English site about mapping I know off. On it you will find anything you need about mapping. Examples, tutorials, fast help, technical information, and everything else! The users a very nice and will help any one who seeks help.

http://twhl.co.za/index.php

The 303

Is the home of an popular name in Valve mapping world. Get over there and enjoy an abundance of various indepth tutorials on texturing , modeling, mapping and more, rarely found elsewhere.

http://www.the303.org/

Sven COOP forums

Is a forum for the popular Sven COOP mod. On it you can find lots of useful information and catch up with the latest development of SHLT and VHLT tools.

http://www.svencoop.com/forums/

Optimization examples

This web page contains optimization info about skyboxes and skip/hint. Its for Source engine, but the difference is minimal. (GS doesn't have func_detail)

http://optimization.interlopers.net/index.php?printable

Tommy of Escondido's Mapping help

It happened to all of us. We were happily mapping and working, than all of a sudden... Something broke (hopefully not your keyboard/mouse), stuff doesn't work? Check all about errors and useful mapping informations on Tommy's web site:

http://www.slackiller.com/tommy14/errors.htm