http://www.opengl.org/resources/features/KilgardTechniques/LensFlare/

http://www.codeworx.org/opengl_tut44.php

http://www.gamedev.net/reference/articles/article874.asp

http://www.gamedev.net/reference/articles/article813.asp

http://www.geocities.com/SiliconValley/Lakes/1434/lenseffects.html#Gallery