Citing sources part 3

Citing sources part 3 - f controls how fast the highlight...

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36 Reflected Specular Intensity specular intensity models shininess results in highlights most of incident intensity reflected in mirror direction but some is reflected around the mirror direction Phong approximation is pure hack reflected intensity proportional to cos f ( ϕ )
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37 Reflected Specular Intensity (cont) how do we compute the mirror direction? mirror direction mirror direction is a bit expensive to compute we can use the angle β between the normal vector and the halfway vector instead n n n s s r H H H H H H 2 2 + = v s h H H H + =
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38 Reflected Specular Intensity (cont) depends on: light source intensity I s property of light source(s) two material properties specular reflection coefficient ρ s ρ s is fraction of specular intensity reflected by surface •0 ρ s 1 specular reflection exponent f
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Unformatted text preview: f controls how fast the highlight decreases big highlight 1 f 200 small highlight 39 Reflected Specular Intensity (cont) using the mirror direction we get: using the halfway vector we get: yields the reflected specular intensity I spec = I s * s *phong f ( ) = = v r v r H H H H , max ) cos( , max phong ( ) = = n h n h H H H H , max ) cos( , max phong 40 Reflected Specular Intensity (cont) examples of specular surfaces smooth metal, smooth glass, smooth plastics specular reflection coefficient increases left to right specular exponent decreases left to right...
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Citing sources part 3 - f controls how fast the highlight...

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