May 2014
Intermediate to advanced
522 pages
16h 1m
English
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1. Physically Based Area Lights 97
Figure 1.30. Square light shape using GGX distribution exhibiting minor visual arti-
facts.
We prototyped this approach, for rectangular lights, by analytically finding a
polygon representing the light shape and the projected specular cone intersection.
To find the intersection at runtime, we used a GPU-optimized version of the
Liang-Barsky clipping algorithm [Liang and Barsky 84]. A light shape rectangle
was treated as the clipping window, then a polygon representing the projected
specular cone was clipped against it. The end result was an array of vertices
representing a planar, non-self-intersecting polygon. In order ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.