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1
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- Project 2 artifact winners
- Project 3
- demo session at the end of class
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2
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- Readings
- Forsyth and Ponce, section 5.4
- online: http://www.cs.berkeley.edu/~daf/bookpages/pdf/chap05-final.pdf
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3
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4
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5
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6
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7
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- Get better results by using more lights
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8
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- Trick: place a chrome sphere in
the scene
- the location of the highlight tells you where the light source is
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9
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10
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- Can compute q (and hence N)
from this figure
- Now just reflect V about N to obtain L
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11
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- Get a similar equation for V2
- Each normal gives us two linear constraints on z
- compute z values by solving a matrix equation
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12
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13
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14
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- Big problems
- doesn’t work for shiny things, semi-translucent things
- shadows, inter-reflections
- Smaller problems
- camera and lights have to be distant
- calibration requirements
- measure light source directions, intensities
- camera response function
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15
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- Weight each equation by the pixel brightness:
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Notes