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Non-Photorealistic Rendering or More-Interesting Rendering (in a more positive sense)

Non-Photorealistic Rendering or More-Interesting Rendering (in a more positive sense). Presented by Adam Smith for CMPS160. What is NPR ?. NPR is showing an image that purposely differs from photographic representation. May or may not be true to nature on any number of levels

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Non-Photorealistic Rendering or More-Interesting Rendering (in a more positive sense)

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  1. Non-Photorealistic Renderingor More-Interesting Rendering(in a more positive sense) Presented by Adam Smith for CMPS160

  2. What is NPR? • NPR is showing an image that purposely differs from photographic representation. • May or may not be true to nature on any number of levels • Simulations of artists real tools • Made-up systems simulate non-natural processes

  3. Why is NPR used? • Convey more information • Eliminate distracting information • Create art • “artificial creativity” (human or not, does it matter?) • Meta-creativity of algorithm designer

  4. Categorization of Methods • User control • Very interactive • User pokes / paints / scrapes to build image • Fully automatic • User feeds in input, views output • Input Types • 3d scenes (geometry) • 2d images (raster or vector) • Direct input (brushstrokes)

  5. Automatic Brush Stroke Rendering • Are strokes stuck to canvas or object? • Canvas: • Shower-door effect • More natural look • (cablecar.avi) • Object: • A painted 3d world • More abstract • (hay.avi)

  6. Pen and Ink SketchHigh Contrast Methods • Print nicely (on b&w only printers) • Harmonize with text • Can eliminate unnecesary details • Can still represent small important details

  7. Stylized Halftoning Represents different materialswhen color is not available. Encodes importance data.

  8. Example: Real-Time Hatching • Hatching conveys: • Material • Tone • Form

  9. Oh no! • Excel doesn’t support .wmv’s! • {hatching.wmv goes here}

  10. Toon/Cel Shading • Silhouete outlines • Shadows • Highlights • Simple lines

  11. Simulation of Traditional Media • Draw with accurately simulated brushes, crayon scrapes, chalk buildups

  12. Non-traditional Perspective

  13. Khronos Projector • We saw creative mapping from 3D of space to 2D of space. • How about a creative mapping from 3D of spacetime to some other 3D of spacetime?

  14. Stylized Motion • Convey motion (change over time) in a 2D image. • Examples: • Speed lines • Motion blur • Squash and stretch

  15. “Video Tooning” • Generating a cartoon-looking image from a single frame of animation is easy (relatively) • It’s hard to make a full animation look hand drawn. • Video…

  16. VideoTooning.WMV • Ugh… gotta switch back to VLC again

  17. Technical Illustration

  18. Scientific Visualization

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