TU Darmstadt / ULB / TUbiblio

Screen-Space Ambient Occlusion Using A-Buffer Techniques

Bauer, Fabian ; Knuth, Martin ; Kuijper, Arjan ; Bender, Jan (2013)
Screen-Space Ambient Occlusion Using A-Buffer Techniques.
13th International Conference on Computer-Aided Design and Computer Graphics. Proceedings.
doi: 10.1109/CADGraphics.2013.26
Conference or Workshop Item, Bibliographie

Abstract

Computing ambient occlusion in screen-space (SSAO) is a common technique in real-time rendering applications which use rasterization to process 3D triangle data. However, one of the most critical problems emerging in screen-space is the lack of information regarding occluded geometry which does not pass the depth test and is therefore not resident in the G-buffer. These occluded fragments may have an impact on the proximity-based shadowing outcome of the ambient occlusion pass. This not only decreases image quality but also prevents the application of SSAO on multiple layers of transparent surfaces where the shadow contribution depends on opacity. We propose a novel approach to the SSAO concept by taking advantage of per-pixel fragment lists to store multiple geometric layers of the scene in the G-buffer, thus allowing order independent transparency (OIT) in combination with high quality, opacity-based ambient occlusion (OITAO). This A-buffer concept is also used to enhance overall ambient occlusion quality by providing stable results for low-frequency details in dynamic scenes. Furthermore, a flexible compression-based optimization strategy is introduced to improve performance while maintaining high quality results.

Item Type: Conference or Workshop Item
Erschienen: 2013
Creators: Bauer, Fabian ; Knuth, Martin ; Kuijper, Arjan ; Bender, Jan
Type of entry: Bibliographie
Title: Screen-Space Ambient Occlusion Using A-Buffer Techniques
Language: English
Date: 2013
Publisher: IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif.
Event Title: 13th International Conference on Computer-Aided Design and Computer Graphics. Proceedings
DOI: 10.1109/CADGraphics.2013.26
Abstract:

Computing ambient occlusion in screen-space (SSAO) is a common technique in real-time rendering applications which use rasterization to process 3D triangle data. However, one of the most critical problems emerging in screen-space is the lack of information regarding occluded geometry which does not pass the depth test and is therefore not resident in the G-buffer. These occluded fragments may have an impact on the proximity-based shadowing outcome of the ambient occlusion pass. This not only decreases image quality but also prevents the application of SSAO on multiple layers of transparent surfaces where the shadow contribution depends on opacity. We propose a novel approach to the SSAO concept by taking advantage of per-pixel fragment lists to store multiple geometric layers of the scene in the G-buffer, thus allowing order independent transparency (OIT) in combination with high quality, opacity-based ambient occlusion (OITAO). This A-buffer concept is also used to enhance overall ambient occlusion quality by providing stable results for low-frequency details in dynamic scenes. Furthermore, a flexible compression-based optimization strategy is introduced to improve performance while maintaining high quality results.

Uncontrolled Keywords: Business Field: Virtual engineering, Research Area: Computer graphics (CG), Rasterizations, Realtime rendering, Ambient occlusion, Transparency computation
Divisions: 20 Department of Computer Science
20 Department of Computer Science > Interactive Graphics Systems
Date Deposited: 12 Nov 2018 11:16
Last Modified: 12 Nov 2018 11:16
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details