Adding and removing noise Example

• C++

  #include <MRMesh/MRAddNoise.h>
  #include <MRMesh/MRBox.h>
  #include <MRMesh/MRMesh.h>
  #include <MRMesh/MRMeshLoad.h>
  #include <MRMesh/MRMeshSave.h>
  #include <MRMesh/MRNormalDenoising.h>
   
  #include <iostream>
   
  int main()
  {
      // Load mesh
      auto loadRes = MR::MeshLoad::fromAnySupportedFormat( "mesh.stl" );
      if ( !loadRes.has_value() )
      {
          std::cerr << loadRes.error() << std::endl;
          return 1;
      }
      MR::Mesh& mesh = *loadRes;
   
      // Add noise to the mesh
      std::ignore = MR::addNoise( mesh.points, mesh.topology.getValidVerts(), {
          .sigma = mesh.computeBoundingBox().diagonal() * 0.0001f,
      } );
   
      // Invalidate the mesh because of the external vertex changes
      mesh.invalidateCaches();
   
      // Save the noised mesh
      if ( auto saveRes = MR::MeshSave::toAnySupportedFormat( mesh, "noised_mesh.stl" ); !saveRes )
      {
          std::cerr << saveRes.error() << std::endl;
          return 1;
      }
   
      // Denoise the mesh with sharpening for sharp edges
      // see the article "Mesh Denoising via a Novel Mumford-Shah Framework"
      std::ignore = MR::meshDenoiseViaNormals( mesh );
   
      // Save the denoised mesh
      if ( auto saveRes = MR::MeshSave::toAnySupportedFormat( mesh, "denoised_mesh.stl" ); !saveRes )
      {
          std::cerr << saveRes.error() << std::endl;
          return 1;
      }
  }

• Python

  Note

  Python API version 3 and later

  from meshlib import mrmeshpy as mm
   
  # Load mesh
  mesh = mm.loadMesh("mesh.stl")
   
  # Create parameters for adding noise
  nSettings = mm.NoiseSettings()
  nSettings.sigma = mesh.computeBoundingBox().diagonal()*0.0001
   
  # Add noise to mesh
  mm.addNoise(mesh.points,mesh.topology.getValidVerts(),nSettings)
   
  # Save noised mesh
  mm.saveMesh(mesh,"noised_mesh.stl")
   
  # Denoise mesh with sharpening for sharp edges
  # see the article "Mesh Denoising via a Novel Mumford-Shah Framework"
  mm.meshDenoiseViaNormals( mesh )
   
  # Save denoised mesh
  mm.saveMesh(mesh,"denoised_mesh.stl")

• C

  #include <MRMeshC/MRAddNoise.h>
  #include <MRMeshC/MRMesh.h>
  #include <MRMeshC/MRMeshLoad.h>
  #include <MRMeshC/MRMeshSave.h>
  #include <MRMeshC/MRNormalDenoising.h>
   
  #include <stdlib.h>
   
  int main( int argc, char* argv[] )
  {
      // Load mesh
      MRMesh* mesh = mrMeshLoadFromAnySupportedFormat( "mesh.stl", NULL );
   
      // Add noise to the mesh
      MRBox3f box = mrMeshComputeBoundingBox( mesh, NULL );
      MRNoiseSettings noiseSettings = mrNoiseSettingsNew();
      noiseSettings.sigma = mrBox3fDiagonal( &box ) * 0.0001f;
      mrAddNoiseToMesh( mesh, NULL, &noiseSettings, NULL );
   
      // Invalidate the mesh because of the external vertex changes
      mrMeshInvalidateCaches( mesh, true );
   
      // Save the noised mesh
      mrMeshSaveToAnySupportedFormat( mesh, "noised_mesh.stl", NULL, NULL );
   
      // Denoise the mesh with sharpening for sharp edges
      // see the article "Mesh Denoising via a Novel Mumford-Shah Framework"
      mrMeshDenoiseViaNormals( mesh, NULL, NULL );
   
      // Save the denoised mesh
      mrMeshSaveToAnySupportedFormat( mesh, "denoised_mesh.stl", NULL, NULL );
   
      mrMeshFree( mesh );
      return EXIT_SUCCESS;
  }