::New();
bf->SetInputConnection(0, TransformFilter_voronoi->GetOutputPort());
bf->SetInputConnection(1, TransformFilter_curve->GetOutputPort());
bf->SetOperModeToIntersection();
bf->Update();
plyWriter->SetFileName("intersection_result.obj");
plyWriter->SetInputData(bf->GetOutput());
plyWriter->Write();
AlignBoundingBoxes(vornoi_2d->GetOutput(), bf->GetOutput());
vtkNew< vtkTrimmedExtrusionFilter> extrude_trimmed, extrude_trimmed2;
extrude_trimmed->SetInputData(vornoi_2d->GetOutput());
extrude_trimmed->SetTrimSurfaceConnection(bf->GetOutputPort());
extrude_trimmed->SetExtrusionDirection(0, 0, 1);
extrude_trimmed->SetCapping(false);
extrude_trimmed->Update();
plyWriter->SetFileName("final_.obj");
plyWriter->SetInputData(extrude_trimmed->GetOutput());
plyWriter->Write();
```
---
### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [December 10, 2022, 12:01pm UTC](https://discourse.vtk.org/t/clip-voronoi2d-mesh-interiors/10145/3 "2022-12-10T12:01:45Z")
@will.schroeder @lassoan
---
### Author:  [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [December 10, 2022, 1:58pm UTC](https://discourse.vtk.org/t/clip-voronoi2d-mesh-interiors/10145/4 "2022-12-10T13:58:50Z")
Boolean mesh operation filters built into VTK often fail for valid input. If you want to use Boolean operations on meshes then I would recommend vtkbool library.
Or you can clip polydata robustly using vtkClipPolyData or vtkThreshold.
---
### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [December 10, 2022, 1:59pm UTC](https://discourse.vtk.org/t/clip-voronoi2d-mesh-interiors/10145/5 "2022-12-10T13:59:50Z")
@lassoan
I’m already using vtkbool library. But I just want to get the curved mesh + voronoi cells\<-- clipped.
---
### Author:  [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [December 10, 2022, 2:07pm UTC](https://discourse.vtk.org/t/clip-voronoi2d-mesh-interiors/10145/6 "2022-12-10T14:07:56Z")
You can use vtkClipPolyData or vtkThreshold for clipping. Check out the VTK examples website or Github for examples.
---
### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [December 10, 2022, 4:03pm UTC](https://discourse.vtk.org/t/clip-voronoi2d-mesh-interiors/10145/7 "2022-12-10T16:03:14Z")
@lassoan
Tried the example of VTKThreshold in github, the intersection always fail… however the two shapes(voronoi and the curve grid mesh ) are interesecting.
So I’m gonna try vtkClipPolyData, but confused about which one to choose as clip function ? I have 2D Voronoi mesh, and a 2D curved grid. and I want to get the cells of the voronoi mesh to be clipped with the curvgrid.
---
### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [December 11, 2022, 9:51am UTC](https://discourse.vtk.org/t/clip-voronoi2d-mesh-interiors/10145/8 "2022-12-11T09:51:12Z")
@lassoan
Hello, hope you’re doing fine.
I tried now VTKClipPolyData, but the results are ok, but I want to preserve the curve grid mesh while clipping the cells of the voronoi mesh.
for example here is the original curve grid mesh, and the top cells are voronoi
however with the current polydata cut, it removes the curve grid, and just keeps the voronoi cells clipped only
```auto
vtkNew tri1;
tri1->SetInputData(vornoi_2d->GetOutput());
tri1->Update();
vtkNew tri2;
tri2->SetInputData(polydata); // curve grid
tri2->Update();
vtkNew extrude;
extrude->SetInputData(tri2->GetOutput());
extrude->SetExtrusionTypeToNormalExtrusion();
extrude->SetVector(0, 0, 1);
extrude->SetScaleFactor(320);
extrude->Update();
vtkNew extrude_voronoi;
extrude_voronoi->SetInputData(tri1->GetOutput());
extrude_voronoi->SetExtrusionTypeToNormalExtrusion();
extrude_voronoi->SetVector(0, 0, 1);
extrude_voronoi->SetScaleFactor(320);
extrude_voronoi->Update();
// Get initial alignment using oriented bounding boxes
AlignBoundingBoxes(extrude_voronoi->GetOutput(), extrude->GetOutput());
plyWriter->SetFileName("curve1.obj");
plyWriter->SetInputData(extrude_voronoi->GetOutput());
plyWriter->Write();
plyWriter->SetFileName("curve2.obj");
plyWriter->SetInputData(extrude->GetOutput());
plyWriter->Write();
vtkNew implicit_distance_2;
implicit_distance_2->SetInput(extrude->GetOutput());
vtkSmartPointer clipper =
vtkSmartPointer::New();
clipper->SetInputData(extrude_voronoi->GetOutput());
clipper->SetClipFunction(implicit_distance_2);
clipper->GenerateClippedOutputOn();
clipper->Update();
```