Publication Details
An Improved Non-Orthogonal Texture Warping for Better Shadow Rendering
Navrátil Jan, Ing., Ph.D.
Zemčík Pavel, prof. Dr. Ing., dr. h. c. (DCGM)
shadow-mapping, alias, warping, local warping, minimal frustum, shadows
The paper presents new real-time method for non-orthogonal texture warping. This warping is used for reducing alias error of shadow mapping. It is composed of two sets of warping function - for rows and columns of shadow map.
In interactive applications, shadows are traditionally rendered using the shadow mapping algorithm.
The disadvantage of the algorithm is limited resolution of depth texture which may lead to aliasing artifacts on shadow edges.
This paper introduces an improved depth texture warping with non-orthogonal grid that can be employed for all kinds of light sources.
For instance, already known approaches for reducing aliasing artifacts are widely used in outdoor scenes with directional light sources but they are not directly applicable for point light sources.
We show that the improved warping parameterization reduces the aliasing artifacts and we are able to present high quality shadows regardless of a light source or a camera position in the scene.
@inproceedings{BUT119858,
author="Tomáš {Milet} and Jan {Navrátil} and Pavel {Zemčík}",
title="An Improved Non-Orthogonal Texture Warping for Better Shadow Rendering",
booktitle="WSCG 2015 - Full Papers Proceedings",
year="2015",
pages="99--107",
publisher="Union Agency",
address="Plzeň",
isbn="978-80-86943-65-7",
url="https://www.fit.vut.cz/research/publication/10889/"
}