actor_cylinder;
actor_cylinder->SetMapper(mapper);
actor_cylinder->GetProperty()->SetColor(1, 0, 0);
actor_cylinder->GetProperty()->SetOpacity(0.5);
```
thanks
---
### Author:  [@Ron84](https://discourse.vtk.org/u/Ron84)
#### Post date: [March 17, 2020, 1:46pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/10 "2020-03-17T13:46:13Z")
I need two stl’s or vtk’s! I don’t know your parameters. Try to export one of you cylinders.
---
### Author:  [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [March 17, 2020, 3:16pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/11 "2020-03-17T15:16:09Z")
sure, i have added the polydatas to make the substraction
> **[data.rar](https://wetransfer.com/downloads/d0356823d5f089f6d8e1d9f0c9f0f04020200317151451/6aa9c5)**
>
> 1 file sent via WeTransfer, the simplest way to send your files around the world
Thanks
---
### Author:  [@Ron84](https://discourse.vtk.org/u/Ron84)
#### Post date: [March 17, 2020, 7:00pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/12 "2020-03-17T19:00:01Z")
There is no contact:
---
### Author:  [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [March 18, 2020, 9:23am UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/13 "2020-03-18T09:23:00Z")
Hi sorry i don´t understand why it did not apply the transformation. I checked the vtk files and both polydatas intersect. I hope it is ok this time.
> **[scene.rar](https://wetransfer.com/downloads/5d02728d81245b25dfa566fad513985920200318091918/64628a)**
>
> 1 file sent via WeTransfer, the simplest way to send your files around the world
Thanks
---
### Author:  [@Ron84](https://discourse.vtk.org/u/Ron84)
#### Post date: [March 18, 2020, 5:24pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/14 "2020-03-18T17:24:14Z")
With my filter you will get this result:
---
### Author:  [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [March 18, 2020, 5:38pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/15 "2020-03-18T17:38:21Z")
Awesome results. How long did it take? Is the result a closed surface?.
Thanks for trying and congrats for your library
---
### Author:  [@Ron84](https://discourse.vtk.org/u/Ron84)
#### Post date: [March 18, 2020, 6:22pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/16 "2020-03-18T18:22:33Z")
Only a few milliseconds…
Just apply CleanPolyData and you will have one surface.
---
### Author:  [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [April 15, 2020, 12:35pm UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/17 "2020-04-15T12:35:30Z")
Hi, I am trying to use your library as you suggested but when i try to susbtract two polydatas to empty the extruded stl, it goes very slow. How can i speed up the susbstraction?. Thank you very much
```
vtkNew reader;
reader->SetFileName("filename.stl");
reader->Update();
///// 1
/////// extrude towards height to make the hole
vtkSmartPointer extrude =
vtkSmartPointer::New();
extrude->SetInputData(reader->GetOutput());
extrude->SetExtrusionTypeToVectorExtrusion();
extrude->SetVector(0, 0, 1);
extrude->SetScaleFactor(5.2);
extrude->Update();
///// 2
// Make the basis
vtkSmartPointer normals2 =
vtkSmartPointer::New();
normals2->SetInputData(reader->GetOutput());
normals2->ConsistencyOn();
normals2->SetComputeCellNormals(1);
normals2->SplittingOff();
normals2->Update();
/////// original cut /////
vtkSmartPointer extrude2 =
vtkSmartPointer::New();
extrude2->SetInputData(normals2->GetOutput());
extrude2->SetExtrusionTypeToNormalExtrusion();
//extrude->SetVector(0, 0, -1);
extrude2->SetScaleFactor(3.0);
extrude2->Update();
vtkPolyDataBooleanFilter *bf2 =
vtkPolyDataBooleanFilter::New();
bf2->SetInputConnection(0, extrude->GetOutputPort());
bf2->SetInputConnection(1, extrude2->GetOutputPort());
bf2->SetOperModeToDifference();
bf2->Update();
vtkSmartPointer Mapper4 =
vtkSmartPointer::New();
Mapper4->SetInputData(bf2->GetOutput());
Mapper4->ScalarVisibilityOff();
vtkSmartPointer Actor4 =
vtkSmartPointer::New();
Actor4->SetMapper(Mapper4);
Actor4->GetProperty()->SetColor(0, 0, 1);
// Create renderers and add actors of plane and cube
vtkSmartPointer renderer =
vtkSmartPointer::New();
renderer->AddActor(Actor4);
vtkSmartPointer renderWindow =
vtkSmartPointer::New();
renderWindow->AddRenderer(renderer);
renderWindow->SetSize(600, 600);
vtkSmartPointer interactor =
vtkSmartPointer::New();
interactor->SetRenderWindow(renderWindow);
renderer->SetBackground(0, 0, 0);
renderWindow->Render();
interactor->Start();
```
---
### Author:  [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [June 26, 2020, 9:54am UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/18 "2020-06-26T09:54:27Z")
Hi, one last question, I was thinking again about the booleans you suggested me by now I have it all in volume operations and I got a decent result. But I am thinking that combining both options it can be a good idea to obtain even a better polydata.
But I was wondering in the picture you show why the bottom of the cylinder is not removed from the output of the boolean operation substraction. The result should be a hole. I does not make sense to me. I also got the same issue with the substraction of the polydata with the cylinder.
Thanks
---
### Author:  [@zandarina](https://discourse.vtk.org/u/zandarina)
#### Post date: [July 29, 2020, 7:37am UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/19 "2020-07-29T07:37:28Z")
I found that this is caused in debug but not a release. Amd the vtkAppendPolyData if there is intersection does not work eaither. But I fixed it doing one by one. I will look into the vtkAppendPolyData to see what’s wrong with this filter in the intersections. If I find it out I will let you know because it happens in volume and polydata in boolean operations. Thanks
---
### Author:  [@Koly](https://discourse.vtk.org/u/Koly)
#### Post date: [January 24, 2022, 2:51am UTC](https://discourse.vtk.org/t/substraction-between-one-volume-respect-other-two-volumes-does-not-affect-the-intersected-areas/2760/20 "2022-01-24T02:51:41Z")
Here I have two meshes, I used vtkbool library([GitHub - zippy84/vtkbool: A new boolean operations filter for VTK](https://github.com/zippy84/vtkbool)) to get the result of which the operation of boolean difference, but the result modes have some errors, like holes. I want to known how to solve the problem?Thanks a lot.
[A.stl](https://discourse.vtk.org/uploads/short-url/rghjxqC97vIwA5qSxrTSmf0PQ0K.stl) (684 Bytes)
[B.stl](https://discourse.vtk.org/uploads/short-url/oDlcwLw8rVOq5EXo3hDPr7SPe9W.stl) (61.0 KB)
[result.stl](https://discourse.vtk.org/uploads/short-url/xo5Y0ul54MKPwH6HjW6p0DVOgwj.stl) (82.0 KB)