NPR (Non-photorealistic Rendering)

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

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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?. - PowerPoint PPT Presentation

Transcript of NPR (Non-photorealistic Rendering)

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NPR(Non-photorealistic

Rendering)

Billy Davidson

CS 395 Advanced Graphics

January 22, 2004

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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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Terminology

Image Picture Intrinsic/Invariant Extrinsic Constancy

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Constancy

We do not experience some extrinsic properties of the image we see

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3D -> 2D Mappings

Sketches by 7-year old children

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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

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Projections

Different projections preserve different intrinsic properties

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Vision as Inverse Problem

V() = “Visual reaction” function Not invertible due to ambiguity, emotional

factors, etc.

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Primary vs. Secondary Space

Respect local rules but not global ones

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Primary vs. Secondary Space

Tone mapping

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Representation Systems

Spatial system Primitive system Attribute system Mark system

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Painterly Rendering

Tarzan

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Pen Strokes

Bones

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Cel Shading

The Legend of Zelda: The Wind Waker