I want to use boolean operations to draw a cylinder ring:
- create two cylinder,
- use vtkTrianglefilters,
- and then Boolean operations,
but why is that?
code:
// Function to create a cylinder
vtkSmartPointer<vtkPolyData> CreateCylinder(double radius, double height)
{
auto cylinderSource = vtkSmartPointer<vtkCylinderSource>::New();
cylinderSource->SetCenter(0, 0, 0);
cylinderSource->SetRadius(radius);
cylinderSource->SetHeight(height);
cylinderSource->SetResolution(100); // Controls smoothness of the circle
cylinderSource->Update();
auto triangFilter = vtkSmartPointer<vtkTriangleFilter>::New();
triangFilter->SetInputData(cylinderSource->GetOutput());
triangFilter->Update();
return triangFilter->GetOutput();
}
int main(int, char*[])
{
// Outer cylinder (the larger one)
auto outerCylinder = CreateCylinder(2, 1);
// Inner cylinder (the smaller one to subtract)
auto innerCylinder = CreateCylinder(1, 1);
// Boolean filter to subtract inner cylinder from the outer one
auto booleanFilter = vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();
booleanFilter->SetOperationToUnion();
booleanFilter->SetInputData(0, outerCylinder);
booleanFilter->SetInputData(1, innerCylinder);
booleanFilter->Update();
// Mapper and actor for the resulting ring
auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputData(booleanFilter->GetOutput());
mapper->ScalarVisibilityOff();
auto actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->EdgeVisibilityOn();
....
}
Refer to： What’s the problem? Somebody help me - Support - VTK
