%0 Conference Proceedings
%4 sid.inpe.br/banon/2004/08.12.11.46
%2 sid.inpe.br/banon/2004/08.12.11.46.52
%@doi 10.1109/SIBGRA.2004.1352975
%T Multiple-Depth Shadow Maps
%D 2004
%A Pagot, Christian Azambuja,
%A Comba, Joćo Luiz Dihl,
%A Oliveira Neto, Manuel Menezes de,
%@affiliation Universidade Federal do Rio Grande do Sul - UFRGS
%E Araśjo, Arnaldo de Albuquerque,
%E Comba, Joćo Luiz Dihl,
%E Navazo, Isabel,
%E Sousa, Antōnio Augusto de,
%B Brazilian Symposium on Computer Graphics and Image Processing, 17 (SIBGRAPI) - Ibero-American Symposium on Computer Graphics, 2 (SIACG)
%C Curitiba, PR, Brazil
%8 17-20 Oct. 2004
%I IEEE Computer Society
%J Los Alamitos
%S Proceedings
%K grahics hardware, shadows, shadow mapping.
%X Traditional shadow maps store a single depth value per cell, leading to a binary outcome by the shadow test (either lit or in shadow), and are prone to produce aliased shadow borders. We present a new approach that produces better estimates of shadow percentages and, in combination with percentage closer filtering (PCF), reduces aliasing artifacts using smaller kernel sizes. The new algorithm extends the notions of shadow maps and shadow tests to support the representation of multiple depth values per shadow map cell, as well as multi-valued shadow tests. This new approach has the potential for hardware implementation, but can also be implemented exploiting the programmable capabilities of recent graphics cards.
%@language en
%3 4448_pagot_c.pdf