Real-Time Occlusion Culling with a Lazy Occlusion Grid

Hey, Heinrich; Tobler, Robert F.; Purgathofer, Werner

Real-Time Occlusion Culling with a Lazy Occlusion Grid

Files

217-221.pdf (8.6 MB)

Date

2001

Authors

Hey, Heinrich
Tobler, Robert F.
Purgathofer, Werner

Publisher

The Eurographics Association

Abstract

We present a new conservative image-space occlusion culling method to increase the rendering speed of very large general scenes on today's available hardware without time-expensive preprocessing. The method is based on a low-resolution grid upon a conventional z-buffer. The occlusion information in the grid is updated in a lazy manner. In comparison to related methods this significantly reduces the number of pixels that have to be read from the z-buffer. The grid allows fast decisions if an object is occluded or potentially visible. It is used together with a bounding volume hierarchy that is traversed in a front-to-back order and which allows to cull large parts of the scene at once. A special front-to-back traversal is used if no pixel-level query for the furthest z-value of an image area is available. We show that the method works efficiently on today's available hardware and we compare it with related methods.

        @inproceedings{10.2312:EGWR/EGWR01/217-221
,
booktitle = {Eurographics Workshop on Rendering
},
editor = {S. J. Gortle and K. Myszkowski
},
title = {{Real-Time Occlusion Culling with a Lazy Occlusion Grid
}},
author = {Hey, Heinrich and 
Tobler, Robert F. and 
Purgathofer, Werner
},
year = {2001
},
publisher = {The Eurographics Association
},
ISSN = {1727-3463
},
ISBN = {3-211-83709-4
},
DOI = {10.2312/EGWR/EGWR01/217-221
}
}