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Issue No. 01 - January/February (2005 vol. 11)
ISSN: 1077-2626
pp: 81-90
Amitava Datta , IEEE Computer Society
In this paper, we identify a general paradigm for portal-based rendering and present an image-space algorithm for rendering complex portals. Our general paradigm is an abstraction of portal-based rendering that is independent of scene geometry. It provides a framework for flexible and dynamic scene composition by connecting cells with transformative portals. Our rendering algorithm maintains a visible volume in image-space and uses fragment culling to discard fragments outside of this volume. We discuss our implementation in OpenGL and present results that show it provides correct rendering of complex portals at interactive rates on current hardware. We believe that our work will be useful in many applications that require a means of creating dynamic and meaningful visual connections between different sets of data.
Portal-based rendering, fragment-culling, dual-depth-buffer, scene composition, complex portals.

N. Lowe and A. Datta, "A New Technique for Rendering Complex Portals," in IEEE Transactions on Visualization & Computer Graphics, vol. 11, no. , pp. 81-90, 2005.
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