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Non-Photorealistic Rendering

Non-Photorealistic Rendering. Greg Turk College of Computing and GVU Center. Painterly Rendering for Animation Barbara Meier, SIGGRAPH 1996. Painterly Rendering Issues. Frame-to-frame coherence (maintain strokes across time) Idea: fix brush strokes in screen-space

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Non-Photorealistic Rendering

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  1. Non-PhotorealisticRendering Greg Turk College of Computing and GVU Center

  2. Painterly Rendering for Animation Barbara Meier, SIGGRAPH 1996

  3. Painterly Rendering Issues • Frame-to-frame coherence (maintain strokes across time) • Idea: fix brush strokes in screen-space • Problem: shower door effect • Better idea: fix brush strokes to object

  4. Brushes (color & opacity): Painting Pipeline

  5. Different Brushes and Orientation Fields

  6. Draw Image in Layers

  7. Video

  8. Pen and Ink Sketches Mike Salisbury, Michael Wong, John Hughes and David Salesin, SIGGRAPH 1997

  9. Final Image Gray scale image Direction field Brush Strokes = + + Pen and Ink • Given: grayscale image (e.g. photo) • Make: pen-and-ink illustration • Approach:

  10. Pen and Ink Sketches Tone Map Strokes Orientation Field

  11. Pen and Ink Sketches Tone Map Strokes Orientation Field

  12. Stroke Details • Strokes are B-spline curves (similar to Bezier) • Strokes clipped to silhouettes • Stroke density controlled by blurred stroke image • Strokes follow orientation field

  13. Painting Orientation Field

  14. Stroke Density Strokes Blurred Strokes

  15. Stroke Density Varies with Drawing Size

  16. Art-Based Rendering Of Fur, Grass and Trees Kowalski, Markosian, Northrup, Bourdev, Barzel and Hughes, SIGGRAPH 2000

  17. Approach • Real-time rendering • Use reference images for color and object ID • Place “strokes” based on density • Try to place same strokes on next frame

  18. Reference Images: Hardware Rendering

  19. Final Image

  20. Stroke Drawing

  21. “Illustrating Smooth Surfaces” Aaron Hertzman and Denis Zorin SIGGRAPH 2000

  22. Goals • Create pen-and-ink strokes based on 3D geometry • Show silhouettes • Have cross-hatching

  23. Issues • Silhouette detection • Orientation field (use curvature) • Hatching • Undercuts

  24. Silhouette Detection

  25. Orientation Field Smoothing

  26. Orientation Field and Shading

  27. Hatching

  28. Hatching and Undercuts

  29. Results

  30. Results

  31. Other NPR • Cel Animation • Painterly Video • Cel Video • ???

  32. Painterly Video “What Dreams May Come”

  33. Cel Animation: Zelda Windwalker

  34. Cel-Like Video

  35. End

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