Filling Holes

Example of filling holes

• C++

  #include <MRMesh/MRMesh.h>
  #include <MRMesh/MRMeshFillHole.h>
  #include <MRMesh/MRMeshLoad.h>
  #include <MRMesh/MRMeshSave.h>
   
  int main()
  {
      // Load mesh
      MR::Mesh mesh = *MR::MeshLoad::fromAnySupportedFormat( "mesh.stl" );
   
      // Find single edge for each hole in mesh
      std::vector<MR::EdgeId> holeEdges = mesh.topology.findHoleRepresentiveEdges();
   
      for ( MR::EdgeId e : holeEdges )
      {
          // Setup filling parameters
          MR::FillHoleParams params;
          params.metric = MR::getUniversalMetric( mesh );
          // Fill hole represented by `e`
          MR::fillHole( mesh, e, params );
      }
   
      // Save result
      auto saveRes = MR::MeshSave::toAnySupportedFormat( mesh, "filledMesh.stl" );
  }

• Python

  import meshlib.mrmeshpy as mrmeshpy
   
  # Load mesh
  mesh = mrmeshpy.loadMesh("mesh.stl")
   
  # Find single edge for each hole in mesh
  hole_edges = mesh.topology.findHoleRepresentiveEdges()
   
  for e in hole_edges:
      #  Setup filling parameters
      params = mrmeshpy.FillHoleParams()
      params.metric = mrmeshpy.getUniversalMetric(mesh)
      #  Fill hole represented by `e`
      mrmeshpy.fillHole(mesh, e, params)
   
  # Save result
  mrmeshpy.saveMesh(mesh, "filledMesh.stl")

• C

  #include <MRMeshC/MRBitSet.h>
  #include <MRMeshC/MRMesh.h>
  #include <MRMeshC/MRMeshFillHole.h>
  #include <MRMeshC/MRMeshLoad.h>
  #include <MRMeshC/MRMeshSave.h>
  #include <MRMeshC/MRMeshTopology.h>
  #include <MRMeshC/MRString.h>
   
  #include <stdio.h>
  #include <stdlib.h>
   
  #define MIN_HOLE_AREA 100.f
   
  int main( int argc, char* argv[] )
  {
      int rc = EXIT_FAILURE;
      if ( argc != 2 && argc != 3 )
      {
          fprintf( stderr, "Usage: %s INPUT [OUTPUT]", argv[0] );
          goto out;
      }
   
      const char* input = argv[1];
      const char* output = ( argc == 2 ) ? argv[1] : argv[2];
   
      // error messages will be stored here
      MRString* errorString = NULL;
   
      MRMesh* mesh = mrMeshLoadFromAnySupportedFormat( input, &errorString );
      if ( errorString )
      {
          fprintf( stderr, "Failed to load mesh: %s", mrStringData( errorString ) );
          mrStringFree( errorString );
          goto out;
      }
   
      // get list of existing holes; each hole is represented by a single edge lying on the hole's border
      MREdgePath* holes = mrMeshFindHoleRepresentiveEdges( mesh );
      if ( holes->size == 0 )
      {
          printf( "Mesh doesn't have any holes" );
          goto out_holes;
      }
   
      // you can set various parameters for the fill hole process; see the documentation for more info
      MRFillHoleParams params = mrFillHoleParamsNew();
      // think of a metric as a method to fill holes in a preferred way
      // you can define one or choose from one of predefined metrics from MRMeshMetrics.h
      MRFillHoleMetric* metric = mrGetUniversalMetric( mesh );
      params.metric = metric;
      // optionally get the bitset of created faces
      MRFaceBitSet* newFaces = mrFaceBitSetNew( 0, false );
      params.outNewFaces = newFaces;
   
      // you can either fill all holes at once or one by one
      // in the second case don't forget to check the output fields of params (e.g. outNewFaces) after every iteration
      size_t newFaceCount = 0;
  #define FILL_ALL_HOLES 1
  #if FILL_ALL_HOLES
      mrFillHoles( mesh, holes->data, holes->size, &params );
      newFaceCount = mrBitSetCount( newFaces );
  #else
      for ( int i = 0; i < mrEdgePathSize( holes ); i++ )
      {
          MREdgeId e = mrEdgePathData( holes )[i];
          MRVector3f holeDirArea = mrMeshHoleDirArea( mesh, e );
          if ( mrVector3Length( &holeDirArea ) >= MIN_HOLE_AREA )
          {
              mrFillHole( mesh, e, &params );
              newFaceCount += mrBitSetCount( newFaces );
          }
      }
  #endif
   
      printf( "Added new %zu faces", newFaceCount );
   
      mrMeshSaveToAnySupportedFormat( mesh, output, &errorString );
      if ( errorString )
      {
          fprintf( stderr, "Failed to save mesh: %s", mrStringData( errorString ) );
          mrStringFree( errorString );
          goto out_newFaces;
      }
   
      rc = EXIT_SUCCESS;
  out_newFaces:
      mrFaceBitSetFree( newFaces );
  out_metric:
      mrFillHoleMetricFree( metric );
  out_holes:
      mrEdgePathFree( holes );
  out_mesh:
      mrMeshFree( mesh );
  out:
      return rc;
  }