Non-Photorealistic Rendering or More-Interesting Rendering (in a more positive sense)
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Non-Photorealistic Rendering or More-Interesting Rendering (in a more positive sense) Presented by Adam Smith for CMPS160
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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 - PowerPoint PPT Presentation
Transcript of Non-Photorealistic Rendering or More-Interesting Rendering (in a more positive sense)
Non-Photorealistic Renderingor
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– Simulations of artists real tools– Made-up systems simulate non-
natural processes
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
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)
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)
QuickTime™ and aCinepak decompressor
are needed to see this picture.
QuickTime™ and aCinepak decompressor
are needed to see this picture.
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
Stylized Halftoning
Represents different materialswhen color is not available.
Encodes importance data.
Example: Real-Time Hatching
• Hatching conveys:– Material– Tone– Form
Oh no!
• Excel doesn’t support .wmv’s!
• {hatching.wmv goes here}
Toon/Cel Shading
• Silhouete outlines
• Shadows
• Highlights
• Simple lines
Simulation of Traditional Media
• Draw with accurately simulated brushes, crayon scrapes, chalk buildups
Non-traditional Perspective
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?
QuickTime™ and aMPEG-4 Video decompressor
are needed to see this picture.
Stylized Motion
• Convey motion (change over time) in a 2D image.
• Examples:– Speed lines– Motion blur– Squash and stretch
“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…
VideoTooning.WMV
• Ugh… gotta switch back to VLC again
Technical Illustration
Scientific Visualization
