Graphics Reference
In-Depth Information
Captured images
Reflectance for point
P
θ
φ
point
P
Change of lighting
direction (
θ
,
φ
)
Figure 8.26
Some reflectance functions for a human face. Reflectance functions are 2D arrays of pixels
formed by extracting the pixel at the same position from all the captured images (top). Each
reflectance function shows how the reflectance at a single point on the surface changes with
lighting direction (bottom). (Courtesy of Paul Debevec.)
Figure 8.27
All the reflectance function images captured from the light stage spotlights can be tiled into
a single texture image (right). A captured image is shown on the left. (Courtesy of Paul
Debevec.) (See Color Plate X.)
