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Occlusion Shadows: Using projected light to generate realistic occlusion effects for view-dependent optical see-throug displays

: Bimber, O.; Fröhlich, B.


Jacobs, A.; Müller, S.; Stricker, D.; Schmalstieg, D. ; Institute of Electrical and Electronics Engineers -IEEE-; Association for Computing Machinery -ACM-; Fraunhofer-Institut für Graphische Datenverarbeitung -IGD-, Darmstadt; European Association for Computer Graphics -EUROGRAPHICS-:
IEEE and ACM International Symposium on Mixed and Augmented Reality 2002. Proceedings : ISMAR 2002 ; september 30 - october 1, 2002 ; Darmstadt, Germany
Los Alamitos, Calif.: IEEE Computer Society, 2002
ISBN: 0-7695-1781-1
International Symposium on Mixed and Augmented Reality (ISMAR) <1, 2002, Darmstadt>
Conference Paper
Fraunhofer IGD ()
display algorithm; viewing algorithm; distributed network graphic; augmented reality

This paper presents projector-based illumination techniques for creating correct occlusion effects for optical see-through setups. We project view-dependent occlusion shadows onto the real surfaces that are located behind virtual objects. This results in a perfect occlusion of real objects by virtual ones. We have implemented and tested our approach in the context of the Virtual Showcase display. We describe hardware extension for projecting light into the showcase and present our rendering techniques for displaying occlusion shadows for single and multi-user environments as well as for single and multi-light-projector configurations. We also report on the limitations of our system for multi-user situations and describe our experiences with a first experimental prototype.