Hardware-accelerated Rendering of Antialiased Shadows with Shadow Maps

Brabec, Stefan; Seidel, Hans-Peter

doi:10.1109/CGI.2001.934676

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Hardware-accelerated Rendering of Antialiased Shadows with Shadow Maps

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Brabec, Stefan
Computer Graphics, MPI for Informatics, Max Planck Society;

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Seidel, Hans-Peter
Computer Graphics, MPI for Informatics, Max Planck Society;

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Citation

Brabec, S., & Seidel, H.-P. (2001). Hardware-accelerated Rendering of Antialiased Shadows with Shadow Maps. In H.-H.-S. Ip, N. Magnenat-Thalmann, R. W. H. Lau, & T.-S. Chua (Eds.), Proceedings Computer Graphics International 2001 (pp. 209-214). Los Alamitos, USA: IEEE.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-329C-6

Abstract

We present a hardware-accelerated method for rendering high quality,
antialiased shadows using the shadow map approach. Instead of relying
on dedicated hardware support for shadow map filtering, we propose
a general rendering algorithm that can be used on most graphics
workstations. The filtering method softens shadow boundaries by using
a technique called percentage closer filtering which is commonly used
in software renderers, e.g ray tracing. In this paper we describe how
the software algorithm can be efficiently mapped to hardware. In order
to achieve real-time or at least interactive frame rates we also
propose a slightly modified shadow filtering method that saves
valuable hardware resources while still achieving good image quality.