Fast generation of curved perspectives for ultra-wide-angle lenses in VR applications

Authors:
Georg Glaeser;Eduard Gröller
Affiliations:
Geometry Department, University of Applied Arts in Vienna, Oskar-Kokoschka-Platz 2, A-1010 Vienna, Austria e-mail: georg.glaeser@uni-ak.ac.at, http://www.uni-ak.ac.at/geom/glaeser.html, Austria;Institute of Computer Graphics, Vienna University of Technology, Karlsplatz 13/186/2, A-1040 Vienna, Austria e-mail: groeller@cg.tuwien.ac.at, http://www.cg.tuwien.ac.at/home, Austria
Venue:
The Visual Computer: International Journal of Computer Graphics
Year:
1999

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Abstract

Classic ultra-wide-angle perspectives are not realistic and often misleading, nevertheless, they have to be used in many applications where the viewer needs a survey of the scene. Current hardware, however, only supports classic perspectives. We present a fast polygon-oriented algorithm that allows the use of curved perspectives in order to overcome several drawbacks, but at the cost of non-linearity. Space is projected onto a sphere rather than onto an image plane. The spherical coordinates are then interpreted two-dimensionally. We discuss the advantages and drawbacks of several approaches to curved perspectives. Time measurements show that real-time animation of reasonably complicated scenes can still be done; the overhead (additional cost of CPU-time) is less than 20%. Thus, curved perspectives are a good choice in virtual reality applications where ultra-wide-angle lenses have to be used.