moab
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Functions | |
ErrorCode | make_tris_from_quad (Interface *MBI, EntityHandle quad, EntityHandle &tri0, EntityHandle &tri1) |
ErrorCode | make_tris_from_quads (Interface *MBI, const Range quads, Range &tris) |
ErrorCode | quads_to_tris (Interface *MBI, EntityHandle input_meshset) |
ErrorCode make_tris_from_quad | ( | Interface * | MBI, |
EntityHandle | quad, | ||
EntityHandle & | tri0, | ||
EntityHandle & | tri1 | ||
) |
Definition at line 21 of file quads_to_tris.cpp.
{ // get connectivity (ordered counterclockwise for 2D elements in MOAB) ErrorCode result; const EntityHandle *quad_conn; int n_verts=0; result = MBI->get_connectivity( quad, quad_conn, n_verts ); assert( 4 == n_verts ); assert( MB_SUCCESS == result); // find length of diagonals std::vector<CartVect> coords(n_verts); result = MBI->get_coords( quad_conn, n_verts, coords[0].array() ); if(MB_SUCCESS != result) return result; CartVect diagA = coords[0] - coords[2]; double lenA_sqr= diagA.length_squared(); CartVect diagB = coords[1] - coords[3]; double lenB_sqr= diagB.length_squared(); // choose the shortest diagonal EntityHandle tri0_conn[3], tri1_conn[3]; if(lenA_sqr < lenB_sqr) { tri0_conn[0] = quad_conn[0]; tri0_conn[1] = quad_conn[1]; tri0_conn[2] = quad_conn[2]; tri1_conn[0] = quad_conn[0]; tri1_conn[1] = quad_conn[2]; tri1_conn[2] = quad_conn[3]; } else { tri0_conn[0] = quad_conn[0]; tri0_conn[1] = quad_conn[1]; tri0_conn[2] = quad_conn[3]; tri1_conn[0] = quad_conn[1]; tri1_conn[1] = quad_conn[2]; tri1_conn[2] = quad_conn[3]; } // make tris from quad result = MBI->create_element(MBTRI, tri0_conn, 3, tri0); assert( MB_SUCCESS == result); result = MBI->create_element(MBTRI, tri1_conn, 3, tri1); assert( MB_SUCCESS == result); return MB_SUCCESS; }
ErrorCode make_tris_from_quads | ( | Interface * | MBI, |
const Range | quads, | ||
Range & | tris | ||
) |
Definition at line 70 of file quads_to_tris.cpp.
{ tris.clear(); for(Range::const_iterator i=quads.begin(); i!=quads.end(); ++i) { EntityHandle tri0, tri1; ErrorCode result = make_tris_from_quad( MBI, *i, tri0, tri1 ); assert(MB_SUCCESS == result); if (MB_SUCCESS != result) return result; tris.insert( tri0 ); tris.insert( tri1 ); } return MB_SUCCESS; }
ErrorCode quads_to_tris | ( | Interface * | MBI, |
EntityHandle | input_meshset | ||
) |
Definition at line 85 of file quads_to_tris.cpp.
{ // create a geometry tag to find the surfaces with ErrorCode result; Tag geom_tag, id_tag; result = MBI->tag_get_handle( GEOM_DIMENSION_TAG_NAME, 1, MB_TYPE_INTEGER, geom_tag, MB_TAG_DENSE|MB_TAG_CREAT ); if (MB_SUCCESS != result) return result; // create an id tag to find the surface id with result = MBI->tag_get_handle( GLOBAL_ID_TAG_NAME, 1, MB_TYPE_INTEGER, id_tag, MB_TAG_DENSE|MB_TAG_CREAT ); if (MB_SUCCESS != result) return result; // get all surface meshsets Range surface_meshsets; int dim = 2; void* input_dim[] = {&dim}; result = MBI->get_entities_by_type_and_tag( input_meshset, MBENTITYSET, &geom_tag, input_dim, 1, surface_meshsets); assert( MB_SUCCESS == result ); std::cout << surface_meshsets.size() << " surfaces found." << std::endl; // ****************************************************************** // Loop over every surface meshset and grab each surface's quads. // ****************************************************************** for( Range::iterator i=surface_meshsets.begin(); i!=surface_meshsets.end(); i++ ) { // get the surface id of the surface meshset int surf_id=0; result = MBI->tag_get_data( id_tag, &(*i), 1, &surf_id ); assert(MB_SUCCESS == result); std::cout << " Surface " << surf_id << " has "; // get all quads of the surface Range quads; result = MBI->get_entities_by_type( *i, MBQUAD, quads ); assert( MB_SUCCESS == result ); std::cout << quads.size() << " quads." << std::endl; // ****************************************************************** // For each quad, make two triangles then delete the quad. // ****************************************************************** for(Range::iterator j=quads.begin(); j!=quads.end(); j++ ) { // make the tris EntityHandle tri0 = 0, tri1 = 0; result = make_tris_from_quad( MBI, *j, tri0, tri1 ); assert( MB_SUCCESS == result ); // add all the tris to the same surface meshset as the quads were inside. result = MBI->add_entities( *i, &tri0, 1 ); if ( MB_SUCCESS != result ) std::cout << "result=" << result << std::endl; assert( MB_SUCCESS == result); result = MBI->add_entities( *i, &tri1, 1 ); assert( MB_SUCCESS == result); // remove the quad from the surface meshset result = MBI->remove_entities( *i, &(*j), 1 ); assert( MB_SUCCESS == result); // delete the quad result = MBI->delete_entities( &(*j), 1 ); assert( MB_SUCCESS == result); } // end quad loop } // end surface meshset loop return MB_SUCCESS; }