Adaptive Caustic Maps Using Deferred Shading.
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| Title: | Adaptive Caustic Maps Using Deferred Shading. |
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| Authors: | Wyman, Chris1 cwyman@cs.uiowa.edu, Nichols, Greg1 gbnichol@cs.uiowa.edu |
| Source: | Computer Graphics Forum. Apr2009, Vol. 28 Issue 2, p309-318. 10p. 5 Color Photographs, 1 Black and White Photograph, 3 Diagrams, 1 Chart, 5 Graphs. |
| Subjects: | Caustics (Optics), Computer graphics software, Rendering (Computer graphics), Computer graphics research, Three-dimensional imaging, Photorealism, Computer software |
| Abstract: | Caustic maps provide an interactive image-space method to render caustics, the focusing of light via reflection and refraction. Unfortunately, caustic mapping suffers problems similar to shadow mapping: aliasing from poor sampling and map projection as well as temporal incoherency from frame-to-frame sampling variations. To reduce these problems, researchers have suggested methods ranging from caustic blurring to building a multiresolution caustic map. Yet these all require a fixed photon sampling, precluding the use of importance-based photon densities. This paper introduces adaptive caustic maps. Instead of densely sampling photons via a rasterization pass, we adaptively emit photons using a deferred shading pass. We describe deferred rendering for refractive surfaces, which speeds rendering of refractive geometry up to 25% and with adaptive sampling speeds caustic rendering up to 200%. These benefits are particularly noticable for complex geometry or using millions of photons. While developed for a GPU rasterizer, adaptive caustic map creation can be performed by any renderer that individually traces photons, e.g., a GPU ray tracer. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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