RealTimeNonPhotorealisticRenderingLinks
http://www.gamedev.net/reference/programming/features/cartoon/
http://www.gamedev.net/reference/articles/article2021.asp
툰렌더링 기사와 샘플
http://graphics.cs.ucdavis.edu/~brettw/wilson_npar.pdf
스케치 일러스트에 가까운 하이퀄리티 툰렌더링에 관한 글
http://www.solidshadertool.de/
셰이더 IDE