• Comprehensible Rendering of 3-D Shapes, Takafumi Saito and Tokiichiro Takahashi

  • Cartoon-Looking Rendering of 3-D Scenes, Philippe Decaudin

  • Casting Curved Shadows on Curved Surfaces, Lance Williams

  • OpenGL Shading Lanugage Second Edition, Randy J. Rost, et al.

  • OpenGL Programming Guide, David Shreiner, et al.

  • Real-Time Rendering Third Edition, Tomas Akenine-Moller, et al.