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Title:      INTERACTIVE COLLISION DETECTION FOR DEFORMABLE AND GPU OBJECTS
Author(s):      Joachim Georgii , Jens Krüger , Rüdiger Westermann
ISBN:      ISSN: 1646-3692
Editors:      Pedro Isaías and Marcin Paprzycki
Year:      2002
Edition:      V II, 2
Keywords:      Collision detection, Graphics hardware, Texture packing
Type:      Journal Paper
First Page:      162
Last Page:      180
Language:      English
Cover:      no-img_eng.gif          
Full Contents:      click to dowload Download
Paper Abstract:      If two closed polygonal objects with outfacing normals intersect each other there exist one or more lines that intersect these objects at at least two consecutive front or back facing object points. In this work we present a method to efficiently detect these lines using depth-peeling and simple fragment operations. Of all polygons only those having an intersection with any of these lines are potentially colliding. Polygons not intersected by the same line do not intersect each other. We describe how to find all potentially colliding polygons and the potentially colliding pairs using a mipmap hierarchy that represents line bundles at ever increasing width. To download only potentially colliding polygons to the CPU for polygon-polygon intersection testing, we have developed a general method to convert a sparse texture into a packed texture of reduced size. Our method exploits the intrinsic strength of GPUs to scan convert large sets of polygons and to shade billions of fragments at interactive rates. It neither requires a bounding volume hierarchy nor a pre-processing stage, so it can efficiently deal with very large and deforming polygonal models. The particular design makes the method suitable for applications where geometry is modified or even created on the GPU.
   

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