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| description |
The advances in the automatic acquisition of 3D geospatial data has
lead to large-scale urban landscape models that can easily consist
nowadays of thousands of building objects. For a photo-realistic
visualisation, each building model has a number of highly detailed
façade textures associated with. Because of the vast amount of
objects and façade images, a brute-force rendering approach is not
feasible for such scenes even on high-performance visualisation
systems. In this paper, two methods are presented to improve the
rendering performance of 3D city models. The first approach is a
generalisation algorithm that automatically generates simplified
versions of 3D building models that can then be used in level of
detail structures. Compared to already known surface simplification
algorithms from the field of computer graphics, the presented
solution yields more sophisticated building models by combining
least squares adjustment theory with an elaborate set of surface
classification und simplification operations. The concept allows the
integration of surface regularities into the building models which
are important for the visual impression. These regularities are
stringently preserved over the course of the generalisation process.
The second approach is an image caching technique that accelerates
the rendering process by reusing parts of previous rendered images
in the current frame. Using this so called impostors technique,
real-time rendering of large-scale urban landscape models is
possible nowadays even on low-cost PC hardware equipped with
commodity 3D graphics accelerators.
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| publisher |
University of Stuttgart : Collaborative Research Center SFB 627
(Nexus: World Models for Mobile Context-Based
Systems)
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| Herbert Wichmann Verlag
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| type |
Text
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| Article in Proceedings
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| source |
In: Fritsch, Dieter (ed.): Proceedings of Photogrammetric Week
'03, pp. 29-38
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| contributor |
Institut für Photogrammetrie (ifp)
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| subject |
Three-Dimensional Graphics and Realism (CR I.3.7)
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