OpenGL Link

http://blog.naver.com/PostView.nhn?blogId=crazygats&logNo=60017606670

http://www.cs.unm.edu/~angel/CS433/LECTURES/CS433_20.pdf

http://hyena0.tistory.com/365

http://ssyworld.tistory.com/19

http://botta.tistory.com/23

http://www.falloutsoftware.com/tutorials/gl/gl8.htm#how_opengl_shades_objects

http://wiki.lazarus.freepascal.org/OpenGL_Tutorial/ko