Tunnel-free voxelisation of rational Bézier surfaces

Wu, Zhang; Lin, Feng; Soon, Seah Hock

doi:10.1007/s00371-003-0215-1

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Voxelization and fabrication of freeform models

Lin

Seah

et al. 2007

Virtual and Physical Prototyping

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We present a volume graphics system for the generation of freeform models and synthesis of complex objects. A unique non-uniform rational B-spline (NURBS) volume representation and its voxelization algorithm are proposed. The forward difference technique is employed to speed up the voxelization process while the desired topological connectivity is preserved. For synthesis of our models and other three-dimensional objects, such as computed tomography images, voxel-based cutting tools are developed for the AutoCAD user interface. Volume rendering is applied to visualize the intermediate and final models. An isosurface is then extracted over the synthesized model and exported to a rapid prototyping machine as an STL file for fabrication. The approach taken in this system has been proven robust and efficient in modelling and fabrication of complex freeform models.

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