July 2015
Intermediate to advanced
586 pages
17h 21m
English
Content preview from GPU Pro 6
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70 II Rendering
1.2.4 Image-Based Reflections
Image-based reflections are a reflection technique implemented in [Wright 11].
The key idea is to introduce one or more planar quad reflection proxies and pre-
render an object of interest into it. During fragment shading, we just ray-trace
the reflected ray against an array of proxies in the pixel shader. A similar idea
is utilized in [Lagarde and Zanuttini 13]. However, in the latter, the reflections
are rendered only for planes at a single height. Therefore, we were unable to use
optimizations proposed in [Lagarde and Zanuttini 13].
In Thief, our ambition was to have around 50 IBR proxies per scene. IBR
back-face ...
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