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NPR (Non-photorealistic Rendering)

NPR (Non-photorealistic Rendering). Billy Davidson CS 395 Advanced Graphics January 22, 2004. Non-photorealistic Rendering. Most computer graphics work strives for photorealism Other types of depiction can be more expressive or artistic Depict intrinsic or extrinsic properties?.

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NPR (Non-photorealistic Rendering)

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  1. NPR(Non-photorealistic Rendering) Billy Davidson CS 395 Advanced Graphics January 22, 2004

  2. Non-photorealistic Rendering • Most computer graphics work strives for photorealism • Other types of depiction can be more expressive or artistic • Depict intrinsic or extrinsic properties?

  3. Terminology • Image • Picture • Intrinsic/Invariant • Extrinsic • Constancy

  4. Constancy • We do not experience some extrinsic properties of the image we see

  5. 3D -> 2D Mappings • Sketches by 7-year old children

  6. Depiction • Depiction is the mapping of properties of the scene to properties of the picture • Traditional 3D -> 2D geometric projection is only one possible meaningful mapping

  7. Projections • Different projections preserve different intrinsic properties

  8. Vision as Inverse Problem • V() = “Visual reaction” function • Not invertible due to ambiguity, emotional factors, etc.

  9. Primary vs. Secondary Space • Respect local rules but not global ones

  10. Primary vs. Secondary Space • Tone mapping

  11. Representation Systems • Spatial system • Primitive system • Attribute system • Mark system

  12. Painterly Rendering • Tarzan

  13. Pen Strokes • Bones

  14. Cel Shading • The Legend of Zelda: The Wind Waker

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