Mesh export

Export example of points and triangles from mesh (e.g. for rendering)

• C++

  #include <MRMesh/MRCube.h>
  #include <MRMesh/MRMesh.h>
   
  int main()
  {
      // create some mesh
      MR::Mesh mesh = MR::makeCube();
   
      // all vertices of valid triangles
      const std::vector<std::array<MR::VertId, 3>> triangles = mesh.topology.getAllTriVerts();
   
      // all point coordinates
      const std::vector<MR::Vector3f> & points =  mesh.points.vec_;
      // triangle vertices as triples of ints (pointing to elements in points vector)
      const int * vertexTriples = reinterpret_cast<const int*>( triangles.data() );
   
      // TODO: export in your format
      std::ignore = points;
      std::ignore = vertexTriples;
  }

• Python See a more relevant example Numpy support
• C

  #include <MRCMesh/MRCube.h>
  #include <MRCMesh/MRMesh.h>
  #include <MRCMesh/MRMeshTopology.h>
  #include <MRCMesh/MRString.h>
  #include <MRCMesh/MRVector.h>
  #include <MRCMesh/MRVector3.h>
   
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
   
  int main( void )
  {
      const MR_Vector3f size = MR_Vector3f_diagonal( 1.f );
      const MR_Vector3f base = MR_Vector3f_diagonal( -0.5f );
   
      MR_Mesh* mesh = MR_makeCube( &size, &base );
   
      // extract vertices
      const MR_Vector3f* vertices = MR_VertCoords_data_const( MR_Mesh_Get_points( mesh ) );
      size_t verticesNum = MR_VertCoords_size( MR_Mesh_Get_points( mesh ) );
      // you can access coordinates via struct fields...
      printf( "Vertex coordinates:\n" );
      for ( size_t i = 0; i < verticesNum; ++i )
          printf( "  vertex %d:  % f; % f; % f\n", (int)i, vertices[i].x, vertices[i].y, vertices[i].z );
      // ...or cast them to a row-major float array
      float* vertexData = malloc( sizeof( float ) * 3 * verticesNum );
      memcpy( vertexData, vertices, sizeof( MR_Vector3f ) * verticesNum );
   
      // extract faces
      MR_Triangulation* t = MR_MeshTopology_getTriangulation( MR_Mesh_Get_topology( mesh ) );
      const MR_std_array_MR_VertId_3 *faces = MR_Triangulation_data_const( t );
      size_t facesNum = MR_Triangulation_size( t );
      // faces are stored as vertex id triples...
      printf( "Face vertex IDs:\n" );
      for ( size_t i = 0; i < verticesNum; ++i )
          printf( "  face %d:  %d, %d, %d\n", (int)i, faces[i].elems[0].id_, faces[i].elems[1].id_, faces[i].elems[2].id_ );
      // ...and can also be cast to an integer array
      int* faceData = malloc( sizeof( int ) * 3 * facesNum );
      memcpy( faceData, faces, sizeof( MR_std_array_MR_VertId_3 ) * facesNum );
   
      MR_Triangulation_Destroy( t );
      MR_Mesh_Destroy( mesh );
      free( vertexData );
      free( faceData );
      return EXIT_SUCCESS;
  }

• C#

  public static class MeshExportExample
  {
      public static void Run(string[] args)
      {
          try
          {
              MR.Mesh mesh = MR.makeCube(MR.Vector3f.diagonal(1), MR.Vector3f.diagonal(-0.5f));
              Console.WriteLine("Vertices coordinates:");
              for (ulong i = 0; i < mesh.points.size(); ++i)
              {
                  var p = mesh.points[new MR.VertId(i)];
                  Console.WriteLine("Vertex {0} coordinates: {1}; {2}; {3}", i, p.x, p.y, p.z);
              }
   
              MR.Triangulation tri = mesh.topology.getTriangulation();
   
              for (ulong i = 0; i < tri.size(); ++i)
              {
                  var t = tri[new MR.FaceId(i)];
                  Console.WriteLine("Triangle {0} vertices: {1}; {2}; {3}", i, t.elems._0.id, t.elems._1.id, t.elems._2.id);
              }
          }
          catch (Exception e)
          {
              Console.WriteLine("Error: {0}", e.Message);
          }
      }
  }