Points to Mesh Example

Example of generating a triangulation from a pointcloud.

• C++

  #include <MRMesh/MRPointsLoad.h>
  #include <MRMesh/MRPointCloud.h>
  #include <MRMesh/MRPointCloudTriangulation.h>
  #include <MRMesh/MRMeshSave.h>
  #include <iostream>
   
  int main()
  {
      // load points
      auto loadRes = MR::PointsLoad::fromAnySupportedFormat( "Points.ply" );
      if ( !loadRes.has_value() )
      {
          std::cerr << loadRes.error() << "\n";
          return 1; // error while loading file
      }
      auto triangulationRes = MR::triangulatePointCloud( *loadRes );
      assert( triangulationRes ); // can be nullopt only if canceled by progress callback
   
      auto saveRes = MR::MeshSave::toAnySupportedFormat( *triangulationRes, "Mesh.ctm" );
      if ( !saveRes.has_value() )
      {
          std::cerr << saveRes.error() << "\n";
          return 1; // error while saving file
      }
      return 0;
  }

• Python

  from meshlib import mrmeshpy as mm
  from pathlib import Path
   
  pc = mm.loadPoints("Points.ply")
  nefertiti_mesh = mm.triangulatePointCloud(pc)
  mm.saveMesh(nefertiti_mesh, "Mesh.ctm")

• C

  #include <MRCMesh/MRPointsLoad.h>
  #include <MRCMesh/MRPointCloud.h>
  #include <MRCMesh/MRPointCloudTriangulation.h>
  #include <MRCMesh/MRMeshSave.h>
  #include <MRCMisc/expected_MR_Mesh_std_string.h>
  #include <MRCMisc/expected_MR_PointCloud_std_string.h>
  #include <MRCMisc/expected_void_std_string.h>
  #include <MRCMisc/std_optional_MR_Mesh.h>
  #include <MRCMisc/std_string.h>
   
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
   
  int main( void )
  {
      int rc = EXIT_FAILURE;
      // load points
      MR_expected_MR_PointCloud_std_string* loadRes = MR_PointsLoad_fromAnySupportedFormat_2( "Points.ply", NULL, NULL );
      MR_PointCloud* pointCloud = MR_expected_MR_PointCloud_std_string_GetMutableValue( loadRes );
      if ( !pointCloud )
      {
          fprintf( stderr, "Failed to load points: %s\n", MR_std_string_Data( MR_expected_MR_PointCloud_std_string_GetError( loadRes ) ) );
          goto fail_load; // error while loading file
      }
      MR_std_optional_MR_Mesh* triangulationRes = MR_triangulatePointCloud( pointCloud, NULL, NULL );
      MR_Mesh* mesh = MR_std_optional_MR_Mesh_MutableValue( triangulationRes );
      if ( !mesh )
      {
          fprintf( stderr, "Triangulation canceled" );
          goto fail_triangulation; // can be nullopt only if canceled by progress callback
      }
   
      MR_expected_void_std_string* saveEx = MR_MeshSave_toAnySupportedFormat_3( mesh, "mesh.ply", NULL, NULL );
      if ( MR_expected_void_std_string_GetError( saveEx ) )
      {
          fprintf( stderr, "Failed to save mesh: %s\n", MR_std_string_Data( MR_expected_void_std_string_GetError( saveEx ) ) );
          goto fail_save; // error while saving file
      }
   
      rc = EXIT_SUCCESS;
  fail_save:
      MR_expected_void_std_string_Destroy( saveEx );
  fail_triangulation:
      MR_std_optional_MR_Mesh_Destroy( triangulationRes );
  fail_load:
      MR_expected_MR_PointCloud_std_string_Destroy( loadRes );
      return rc;
  }