June 2012
Beginner to intermediate
268 pages
8h 59m
English
Content preview from Shadow Algorithms Data Miner
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4.5. Shadow Depth Maps 121
penumbra cone
light
spherical
penumbra cone
penumbra
sheet
receiver plane
occluder
Fi gure 4.21. Penumbra cones and sheets are generated from the vertices and edge of the
occluder.
Figure 4.20, where the skin for the shadows from the boxes are illustrated in the
two shadow depth maps). When the light source is large, accuracy of the above
approach may be poor, and the number of shadow depth maps generated can be
increased above two so that the accuracy can be improved. Ying et al. [652] extend
that approach for (polygonal) area lights in which a visibility map is computed per
light boundary edge.
Wyman and Hansen [646] generate cones ...
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