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Visibility-driven Polygon Rendering for Interactive Virtual Colonoscopy

This paper describes an implementation of a surface based rendering algorithm used for virtual colonoscopy. The colon surface data is acquired by extracting a surface from computer tomography data sets. The connectivity meshes of the resulting triangles are reconstructed to determine which parts of the iso-surface belong to the colon. Further the colon is intersected into a number of pieces along its center-line. Then these pieces are rendered depending on their visibility using graphics hardware capable of triangle rasterisation. The implementation of the rendering algorithm is embedded into the virtual endoscopy environment VirEn.