Example

  CRhinoCommand::result CCommandTest::RunCommand( const CRhinoCommandContext& context )
  {
    CRhinoGetObject go0;
    go0.SetCommandPrompt( L"Select first set of meshes" );
    go0.SetGeometryFilter( CRhinoGetObject::mesh_object );
    go0.GetObjects( 1, 0 );
    if( go0.CommandResult() != success )
      return go0.CommandResult();


    CRhinoGetObject go1;
    go1.SetCommandPrompt( L"Select second set of meshes" );
    go1.SetGeometryFilter( CRhinoGetObject::mesh_object );
    go1.EnablePreSelect( false );
    go1.EnableDeselectAllBeforePostSelect( false );
    go1.GetObjects( 1, 0 );
    if( go1.CommandResult() != success )
      return go1.CommandResult();


    ON_SimpleArray<const CRhinoObject*> DeleteList( go0.ObjectCount() + go1.ObjectCount() );
    int i = 0;


    ON_SimpleArray<const ON_Mesh*> InMeshes0( go0.ObjectCount() );
    ON_SimpleArray<const ON_3dmObjectAttributes*> InAttributes0( go0.ObjectCount() );
    for( i = 0; i < go0.ObjectCount(); i++ )
    {
      const CRhinoObject* p = go0.Object(i).Object();
      if( !p )
        return failure;


      const ON_Mesh* mesh = ON_Mesh::Cast( p->Geometry() );
      if( !mesh )
        return failure;


      InMeshes0.Append( mesh );
      InAttributes0.Append( &p->Attributes() );


      DeleteList.Append( p );
    }


    ON_SimpleArray<const ON_Mesh*> InMeshes1( go1.ObjectCount() );
    for( i = 0; i < go1.ObjectCount(); i++ )
    {
      const CRhinoObject* p = go1.Object(i).Object();
      if( !p )
        return failure;


      const ON_Mesh* mesh = ON_Mesh::Cast( p->Geometry() );
      if( !mesh )
        return failure;


      InMeshes1.Append( mesh );


      DeleteList.Append( p );
    }


    ON_SimpleArray<ON_Mesh*> OutMeshes;
    ON_SimpleArray<const ON_3dmObjectAttributes*> OutAttributes;
    bool bResult = false;
    bool rc = RhinoMeshBooleanDifference(
          InMeshes0, 
          InMeshes1,
          ON_SQRT_EPSILON*10,
          ON_SQRT_EPSILON*10, 
          &bResult, 
          OutMeshes,
          &InAttributes0,
          &OutAttributes
          );


    if( !rc )
      return failure;


    for( i = 0; i < OutMeshes.Count(); i++ )
    {
      CRhinoMeshObject* pMeshObj = 0;
      if( i < OutAttributes.Count() )
        pMeshObj = new CRhinoMeshObject( *OutAttributes[i] );
      else
        pMeshObj = new CRhinoMeshObject();


      if( pMeshObj )
      {
        pMeshObj->SetMesh( OutMeshes[i] );
        context.m_doc.AddObject( pMeshObj );
      }
      else
      {
        delete OutMeshes[i];
      }
      OutMeshes[i] = 0;
    }


    for( i = 0; i < DeleteList.Count(); i++ )
    {
      if( DeleteList[i] )
        context.m_doc.DeleteObject( DeleteList[i] );
    }


    context.m_doc.Redraw();


    return success;
  }