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Adding Realtime Shadow Feedback to Globally Illuminated Virtual Environments

 
: Schöffel, F.

Skala, V. ; International Federation for Information Processing -IFIP-, Working Group 5.10 Computer Graphics; European Association for Computer Graphics -EUROGRAPHICS-:
WSCG '99. 7. International Conference in Central Europe on Computer Graphics, Visualization and Digital Interactive Media. Conference Proceedings. Vol.1
Plzen: University of West Bohemia, 1999
ISBN: 80-7082-490-5
S.257-264
International Conference in Central Europe on Computer Graphics, Visualization and Digital Interactive Media (WSCG) <7, 1999, Plzen, Czech Republic>
Englisch
Konferenzbeitrag
Fraunhofer IGD ()
interaction; Multipoints; radiosity; realtime feedback; Shadow update

Abstract
In this paper, we introduce a new method for providing realtime shadow feedback in interactive environments with global illumination simulated by a radiosity process. Several approaches for updating global illumination in dynamic environments have been presented in recent years, but none of these can produce true realtime feedback for moderately complex scenes. The realtime shadows presented here are created by manipulating the vertex colors resulting from a previous radiosity calculation. The notion of multipoints is introduced, that allow significant speed-up of the shading process. This method works on the same scene representation as the radiosity simulation does. We show how the multipoint shading method can be integrated into a Virtual Reality system, in combination with a radiosity update process. Thus, our system provides realtime shadows during user interaction and still enables correct soft radiosity shadows to be updated after the interaction has been finished. The visual ap pearance of the realtime shadows is similar to the radiosity shadows, and its visual quality can easily be controlled by the user, which makes the method adjustable and thus applicable to complex environments.

: http://publica.fraunhofer.de/dokumente/PX-3241.html