PLY, OFF and STL files can also be read with Matlab, but require (short) external functions, available at, see Function/IO. Further demos for polyhedron IO are available in the CGAL repo. CGAL includes readers and writers for OFF, PLY, OBJ and STL formats, and the default cin > operator expects an OFF file. Similar hold for OBJ files, although, these files can contain many other types of objects besides polygon meshes. PLY files on the other hand do represent surface meshes, and can be read in CGAL (or easily converted to OFF). Note that it is not necessary that any of these conversions work, since STL file can represent an object with holes in the surface mesh or other degenerated objects. This can be done directly in CGAL by using CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh, through an intermediate program, like Meshlab, or through an online converter, such as. Notably STL, while very common, can be problematic, as it does not include connections between faces, bit only a list of triangles, from which the polyhedron must first be reconstructed. Some of these formats are more appropriate than others. Other formats include STL, PLY and OBJ, and other proprietary formats. OFF files include an option to specify the color of each face, which can be used to identify different surface regions. By default, CGAL reads OFF files, and these files can also be easily viewd by geomview, also trivially installable on most Linux systems. ![]() Some of the formats actually store the polyhedron data (including how faces are connected) and some only store the faces. Polyhedron data is usually stored in a separate file with many different formats available. CGAL can work also with surfaces meshes that are not closed, but for PDE solving in 3D bodies, we assume them to be closed (or watertight) and triangular. Polyhedrons are solid bodies with polygonal faces, and their surface forms a closed mesh. The Qt dependency is not necessary, but can be useful for easier visualization without exporting to an external program. For more general 3D objects, the geometric algorithms become more complex and it makes sense to leverage third-party libraries.Ī good library in c++ is CGAL ( ), that we can use to work with surface meshes: ĬGAL can usually be installed with apt-get install libcgal-dev or similar. More general 2D shapes can be described by polygons, which are also included in Medusa. Medusa is not meant to deal with complex 3D geometry - we support balls, cuboids, and their differences, unions, translations and rotations. 41 How to create a mesh.43 The flags of the mesh elements. 38 Using Microsoft Visual Studio 8 express edition and QT.38 WRITING A PLUGIN. 34 Select Visible Points.35 SUPPORTED FORMATS. 33 Delaunay Triangulation.33 Voronoi Filtering. 30 Description.30 Use With "Align Mesh using Picked Points" filter.31 Notes for Developers who want to use picked points in their plugin. 14 Bridges bulding issue.15 POINT PICKING TOOL. ![]() 13 Hole Filling.13 Hole Bridging.13 Non Manifold Hole Splitting.14 Data Structures.14 Mark interesting faces. ![]() 11 Description.11 Use With "Align Mesh using Picked Points" filter.12 Notes for Developers who want to use picked points in their plugin. 9 Basics.9 Simple Straightening.10 Layer Composition.10 Special Features.10 POINT PICKING TOOL. 8 APPLYING THE SAME MAPPING TO SEVERAL MESHES.
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