VtkUtil.cpp

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/**
 * MOAB, a Mesh-Oriented datABase, is a software component for creating,
 * storing and accessing finite element mesh data.
 *
 * Copyright 2004 Sandia Corporation. Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
 * retains certain rights in this software.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 */
 
#include "moab/VtkUtil.hpp"
 
namespace moab
{
 
const char* VtkUtil::vtkTypeNames[] = {
 "unsigned_char", // MB_TYPE_OPAQUE
 "int", // MB_TYPE_INTEGER
 "double", // MB_TYPE_DOUBLE
 "bit", // MB_TYPE_BIT
 "unsigned_long", // MB_TYPE_HANDLE
};
 
/*
const unsigned VtkUtil::typeSizes[] = {
 1, // MB_TYPE_OPAQUE
 sizeof(int), // MB_TYPE_INTEGER
 sizeof(double), // MB_TYPE_DOUBLE
 1, // MB_TYPE_BIT
 sizeof(EntityHandle), // MB_TYPE_HANDLE
};
*/
 
// Define node ordering for those types for which
// the VTK and MOAB ordering doesn't match. The values
// contained in the array are MOAB connectivity indices,
// and the values used to index the arrays are VTK
// connectivity indices.
const unsigned pixel[] = { 0, 1, 3, 2 };
const unsigned voxel[] = { 0, 1, 3, 2, 4, 5, 7, 6 };
const unsigned wedge[] = { 0, 2, 1, // bottom corners
 3, 5, 4, // top corners
 8, 7, 6, // bottom edges
 14, 13, 12, // top edges
 9, 11, 10, // lateral edges
 17, 16, 15 }; // quadrilateral faces
const unsigned qhex[] = { 0, 1, 2, 3, // corners (same)
 4, 5, 6, 7, 8, 9, 10, 11, // mid-edge (top before lateral)
 16, 17, 18, 19, 12, 13, 14, 15, 23, 21, 20, 22, // mid-face (mixed up) & mid-region (same)
 24, 25, 26 };
 
// List of VtkElemType structs, indexed by the VTK type number.
const VtkElemType VtkUtil::vtkElemTypes[] = {
 { 0, 0, MBMAXTYPE, 0, 0 },
 { "vertex", 1, MBVERTEX, 1, 0 },
 { "polyvertex", 2, MBMAXTYPE, 0, 0 },
 { "line", 3, MBEDGE, 2, 0 },
 { "polyline", 4, MBMAXTYPE, 0, 0 },
 { "triangle", 5, MBTRI, 3, 0 },
 { "triangle strip", 6, MBMAXTYPE, 0, 0 },
 { "polygon", 7, MBPOLYGON, 0, 0 },
 { "pixel", 8, MBQUAD, 4, pixel },
 { "quadrilateral", 9, MBQUAD, 4, 0 },
 { "tetrahedron", 10, MBTET, 4, 0 },
 { "voxel", 11, MBHEX, 8, voxel },
 { "hexahedron", 12, MBHEX, 8, 0 },
 { "wedge", 13, MBPRISM, 6, wedge },
 { "pyramid", 14, MBPYRAMID, 5, 0 },
 { "pentagonal prism", 15, MBMAXTYPE, 10, 0 }, // not supported
 { "hexagonal prism", 16, MBMAXTYPE, 12, 0 }, // not supported
 { 0, 17, MBMAXTYPE, 0, 0 },
 { 0, 18, MBMAXTYPE, 0, 0 },
 { 0, 19, MBMAXTYPE, 0, 0 },
 { 0, 20, MBMAXTYPE, 0, 0 },
 { "quadratic edge", 21, MBEDGE, 3, 0 },
 { "quadratic tri", 22, MBTRI, 6, 0 },
 { "quadratic quad", 23, MBQUAD, 8, 0 },
 { "quadratic tet", 24, MBTET, 10, 0 },
 { "quadratic hex", 25, MBHEX, 20, qhex },
 { "quadratic wedge", 26, MBPRISM, 15, wedge },
 { "quadratic pyramid", 27, MBPYRAMID, 13, 0 },
 { "bi-quadratic quad", 28, MBQUAD, 9, 0 },
 { "tri-quadratic hex", 29, MBHEX, 27, qhex },
 { "quadratic-linear quad", 30, MBMAXTYPE, 6, 0 }, // not supported
 { "quadratic-linear wedge", 31, MBMAXTYPE, 12, wedge }, // not supported
 { "bi-quadratic wedge", 32, MBMAXTYPE, 18, wedge }, // not supported
 { "bi-quadratic hex", 33, MBMAXTYPE, 24, qhex }, // not supported
 { "bi-quadratic triangle", 34, MBMAXTYPE, 0, 0 },
 { "cubic line", 35, MBMAXTYPE, 0, 0 }, // VTK_CUBIC_LINE not supported
 { 0, 36, MBMAXTYPE, 0, 0 },
 { 0, 37, MBMAXTYPE, 0, 0 },
 { 0, 38, MBMAXTYPE, 0, 0 },
 { 0, 39, MBMAXTYPE, 0, 0 },
 { 0, 40, MBMAXTYPE, 0, 0 },
 { "convex point set", 41, MBMAXTYPE, 0, 0 }, // VTK_CONVEX_POINT_SET = 41, not supported
 { "polyhedron", 42, MBPOLYHEDRON, 0, 0 } //
};
 
const unsigned VtkUtil::numVtkElemType = sizeof( VtkUtil::vtkElemTypes ) / sizeof( VtkUtil::vtkElemTypes[0] );
 
// Define an array, indexed by EntityType containing the corresponding
// VTK element type numbers for the linear, quadratic (mid-edge),
// and full (mid-face & mid-region node) elements.
// Zero is used to indicate an invalid type (not supported by VTK.) The
// VTK element type number may be used as an index into vtkElemTypes[].
const int mb_to_vtk_type[][3] = { { 1, 0, 0 }, // MBVERTEX
 { 3, 21, 0 }, // MBEDGE
 { 5, 22, 0 }, // MBTRI
 { 9, 23, 28 }, // MBQUAD
 { 7, 0, 0 }, // MBPOLYGON
 { 10, 24, 0 }, // MBTET
 { 14, 27, 0 }, // MBPYRAMID
 { 13, 26, 0 }, // MBWEDGE
 { 0, 0, 0 }, // MBKNIFE
 { 12, 25, 29 }, // MBHEX
 { 42, 0, 0 }, // MBPOLYHEDRON
 { 0, 0, 0 }, // MBENTITYSET
 { 0, 0, 0 } }; // MBMAXTYPE
 
const VtkElemType* VtkUtil::get_vtk_type( EntityType type, unsigned num_nodes )
{
 const int i = mb_to_vtk_type[type][0]; // Index for linear type
 const int j = mb_to_vtk_type[type][1]; // Index for quadratic type
 const int k = mb_to_vtk_type[type][2]; // Index for full quadratic type
 if( i ) // If element type is supported at all (if not linear then not quadratic either)
 {
 // If the linear type is requested (all polygons are linear
 // irrespective of the number of nodes), return that.
 if( type == MBPOLYGON || type == MBPOLYHEDRON || vtkElemTypes[i].num_nodes == num_nodes )
 return vtkElemTypes + i;
 // Otherwise if there is a quadratic type and the number of
 // nodes specified corresponds to the quadratic type, return that.
 else if( j && vtkElemTypes[j].num_nodes == num_nodes )
 return vtkElemTypes + j;
 // Otherwise if there is a full quadratic type and the number of
 // nodes specified corresponds to the quadratic type, return that.
 else if( k && vtkElemTypes[k].num_nodes == num_nodes )
 return vtkElemTypes + k;
 }
 
 return 0;
}
 
} // namespace moab