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• W9726915 abstract "AbstractRepairing Virtual Reality (VR) models is a challenge for productive applications. This paper describes a fastimplementation of Nooruddin and Turk’s ray-stabbing method 14 based on standard graphics hardware. Ray-stabbing is used to convert a polygonal model into a volume model (also called voxelization). The volume modelis back-converted into a polygonal model using the marchingcubes (MC) algorithm 12 and the QSlim algorithm 7 for reducing the extracted polygon model. The overall process yields a properly closed polygonal model with novisual unimportant features like nested or overlapping geometries or unwanted cracks.The voxelization process is the key part of the reparation process. We discuss implementation details and essentialproblems of ray-stabbing not addressed by Nooruddin and Turk 14 . We focus on the generation of the volume modelutilizing OpenGL hardware support.The current implementation is a snapshot of an ongoing work at EADS Airbus, Europes leading commercialaircraft company. The final goal is a fast model repair and red uction workflow for generating VR-models andvarious levels of detail. Problems erase from the fact, that the polygonalization of the volume model using theMC-algorithm generates a far too fine tessellated model which then has to be reduced again. We also discusspossible approaches to overcome this drawback.1. IntroductionThis paper focuses on implementation and optimization as-pects of model repair for Virtual Reality (VR) applications.Repairing VR-models is an essential step of generating VR-models from CAD-models.One VR-focus of EADS-Airbus(Europe’s leading aircraftmanufacturing company) is rapid prototyping for customiz-ing commercial aircrafts. A typical high-end VR systemis used to present customized aircrafts using a three-sidedCAVE, coupled with different interaction devices and drivenby a SGI ONYX2 with three graphics pipelines.Being able to present the latest aircraft technology, EADSfocuses on the optimization of the generation process of theVR-model from the CAD-model. This process starts witha polygon model exported from the CAD-system (usuallyCADDS 5 or CATIA). These exported model shows severaltroublesome properties, especially holes and nested geome-tries. Additionally, the model is far too fine tessellated. I n thepast the model optimization process at EADS incorporatedtremendous manual effort to construct the final VR-model.To reduce the model, the holes and nested or overlappinggeometries have to be removed first. Especially CAD modelscontain potentially a large amount of this visually unimpor-tant geometry. Furthermore, holes in the initial model causesevere problems for polygon reduction and also for furtherinteractive processing, e.g. for collision detection. It is thetask of the model repair step to remove all these problems.Therefore a robust model repair technique is most essentialto the whole optimization process.Nooruddin and Turk" @default.
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• W9726915 date "2001-01-01" @default.
• W9726915 modified "2023-09-25" @default.
• W9726915 title "Volumetric Model Repair for Virtual Reality Applications" @default.
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• W9726915 doi "https://doi.org/10.2312/egs.20011019" @default.
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