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Journal Article

Practical Shadow Mapping

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons44168

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons44022

Annen,  Thomas
Computer Graphics, MPI for Informatics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons45449

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

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Citation

Brabec, S., Annen, T., & Seidel, H.-P. (2003). Practical Shadow Mapping. Journal of Graphics Tools, 7, 9-18.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-2DC6-A
Abstract
In this paper we present several methods that can greatly improve image quality when using the shadow mapping algorithm. Shadow artifacts introduced by shadow mapping are mainly due to low resolution shadow maps and/or the limited numerical precision used when performing the shadow test. These problems especially arise when the light source's viewing frustum, from which the shadow map is generated, is not adjusted to the actual camera view. We show how a tight fitting frustum can be computed such that the shadow mapping algorithm concentrates on the visible parts of the scene and takes advantage of nearly the full available precision. Furthermore, we recommend uniformly spaced depth values in contrast to perspectively spaced depths in order to equally sample the scene seen from the light source.