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Published byMarjorie Washington Modified over 9 years ago
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Honours Graphics 2008 Session 12
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Today’s focus Non-photorealistic rendering …other topics requested in class…
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Non-photorealistic rendering Sometimes graphics applications require the use of non-photorealistic rendering to achieve some effect (artistic expression, alternate spectrum rendering, etc) For example: cel-shading, pencil etching, calligraphy (japanese big brush style), etc
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Non-photorealistic rendering False color imaging
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Non-photorealistic rendering Pencil sketching Quake
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Non-photorealistic rendering Artistic impression
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Non-photorealistic rendering Calligraphy (Japanese Big Brush)
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Non-photorealistic rendering Cel-shading
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Also “cell-shading” and “cartoon shading” 3D impression of models in traditional cartoon-style lighting, along with pronounced contouring
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Cel-shading, how-to Quite easy to do even on older graphics hardware Two parts: lighting and contouring
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Cel-shading, how-to, cont. Lighting follows the classic diffuse model, but the resultant color value is instead indexed into a one-dimensional array; instead of a blocky lighting array is used
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Cel-shading, how-to, cont. Contouring is done through inverse backface removal First render model normally using cel- lighting Set to render black wire-frame Set lines to render thick Set to cull front faces Render model (z-buffer handles elimination of invisible contours)
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Cel-shading, result
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Topic defined by students …
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