Efficient Multi-view Ray Tracing using Edge Detection and Shader Reuse

Magnus Andersson
Lund University/Intel Corporation

Björn Johnsson
Lund University/Intel Corporation

Jacob Munkberg
Intel Corporation

Petrik Clarberg
Intel Corporation

Jon Hasselgren
Intel Corporation

Tomas Akenine-Möller
Lund University/Intel Corporation

Visual Computer, June 2011

Abstract

Stereoscopic rendering and 3D stereo displays are quickly becoming mainstream. The natural extension is autostereoscopic multi-view displays which, by the use of parallax barriers or lenticular lenses, can accommodate many simultaneous viewers without the need for active or passive glasses. As these displays, for the foreseeable future, will support only a rather limited number of views, there is a need for high-quality interperspective antialiasing. We present a specialized algorithm for efficient multi-view image generation from a camera line using ray tracing, which builds on previous methods for multi-dimensional adaptive sampling and reconstruction of light fields. We introduce multi-view silhouette edges to detect sharp geometrical discontinuities in the radiance function. These are used to significantly improve the quality of the reconstruction. In addition, we exploit shader coherence by computing analytical visibility between shading points and the camera line, and by sharing shading computations over the camera line.

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