​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