Geomview For Windows?
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file format for 3D polyhedral regions
Scott Mitchell of Sandia and I are working on a program to triangulate 3D nonconvex polyhedral objects. I am writing to ask about file formats for storing polyhedra. We need to represent our polyhedral objects in b-rep format. Specifically, we need a file with following information: (1) A list of vertices, giving a name and 3D coordinates for each vertex. (2) A list of edges, giving a name for each edge, and also the names of the two vertices that are its endpoints. (3) A list of polygons (embedded in R^3). For each polygon there is its name and a list of (the names of) edges defining its boundary. Clearly this format could be extended to nonconvex polyhedral objects in any dimension: for each k-dimensional object, the file would provide a name and a list of the (k-1)-dimensional objects defining its boundary. It would be preferable if we could use the Geomview file representations for our own program rather than defining file formats from scratch. However, after looking at the documentation, I come to the conclusion that there is no Geomview file with this kind of information. It seems that the "off" file format does not allow holes in the polygons on the boundary of the object, and the "skel" file format doesn't provide information on which edges are coplanar (making up the same face). Is there any file format in Geomview that allows for generic stratified objects with symbolic links between objects of various dimensions? Thanks, Steve Vavasis
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