An image generation system includes: a glare source drawing section which draws a glare source while referring to a Z value of an original image stored in a Z buffer to generate a first glare source image, and draws the glare source without referring to the Z value of the original image stored in the...http://www.google.com.tw/patents/US7479961?utm_source=gb-gplus-share專利 US7479961 - Program, information storage medium, and image generation system