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← Non-Photorealistic Rendering - Interactive 3D Graphics

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Showing Revision 6 created 05/24/2016 by Udacity Robot.

  1. This kind of reflection model is called Toon Shading, or Cel Shading, or
  2. sometimes Posterization. Toon is short for cartoon. Cel is short for celuloid,
  3. the material for the transparent sheets that are used when animation is drawn
  4. by hand. There are all sorts of variations for this type of rendering. For
  5. example, you can change colors based on the shading level and get more
  6. elaborate effects. In this rendering, a separate image processing shader is
  7. used to detect the edges of the object, and outline them. This type of
  8. illumination model is one example of what's called Non Photorealistic
  9. Rendering, or NPR for short. Photorealistic means "looks like a photo." If you
  10. think about it, there is a nearly infinite number of ways to draw things that
  11. do not look realistic. The running joke is that we've been doing
  12. non-photorealistic rendering on computers for decades, since realism is hard to
  13. achieve. The way I see it is that non-photorealistic rendering has an intent
  14. behind it. Just as we assign different fonts to text to convey a different
  15. impression, NPR is a choice we can make about 3D rendering. Scott McCloud and
  16. his book, Understanding Comics, talks about amplification through
  17. simplification. The idea is that by displaying only the relevant pieces of
  18. information, you strengthen your message. For example, an automobile owner
  19. manual usually has simplified drawings instead of photos. Non-photorealistic
  20. techniques often try to convey information in a more sketchy or artistic way.
  21. For example, a sketchy look can let the viewer know that the result they're
  22. looking at is in just an early stage of design.