Non-manifold medial surface reconstruction from volumetric data
GMP'10 Proceedings of the 6th international conference on Advances in Geometric Modeling and Processing
Polygonization of volumetric skeletons with junctions
Computer-Aided Design
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This paper describes a new algorithm for contouringmedial surface from CT (Computed Tomography) dataa thin plate structure. Thin plate structures are commonmechanical structures such as car body shells. When designingthe thin plate structures in CAD (Computer AidedDesign) and CAE (Computer Aided Engineering) systems,their shapes are usually represented as surface models associatedwith their thickness values. In this research we areaiming at extracting medial surface models of a thin platestructure from its CT data so as to be used in CAD andCAE systems. However, in such CT data, each voxel in regionaround the medial surface can not be classified insideor outside, so we can not easily apply iso-surfacing methodto contour the medial surface.From the above motives, we first extract medial cells(cubes comprising eight neighboring voxels) from the CTdata using a skeletonization method so as to apply MarchingCubes algorithm to extract the medial surface. It is not,however, guaranteed that the Marching Cubes algorithmcan contour those medial cells (in short, not "MarchingCubeable"). We developed cell operations which correcttopological connectivity so as to guarantee such MarchingCubeability. We then apply our method to assign virtualsigns to the voxels to apply the Marching Cubes algorithm.And last, we map thicknesses of thin plate structureto the triangle meshes as textures. A prototype system is developedto show some experimental results.