[vtkusers] Extracting a sphere with vtkSphereWidget

[TomasKiniulis]

Hey folks, have a course in university to study The Visualization Toolkit.
I'm a complete newbie and I'm quite surprised by the lack of information to
learn this tool. So I hope you can help me here.My task is to extract a
sphere from a model using vtkSphereWidget and visualize its scalar atrribute
distribution using vtkGlyphs. How can I use a vtkSphereWidget to extract a
sphere? Do I need to create a sphere that follows around the widget? Any
examples you could suggest of such task?Found this useful example, but it's
using a plane to cut. How would I use this with a
sphere?https://www.vtk.org/Wiki/VTK/Examples/Cxx/VisualizationAlgorithms/CutterThis
is my messy code, my attempt here was to make box cut instead of a plane
one. But instead it throws me an error that "there is no suitable conversion
function from "vtkSmartPointer to "vtkImplicitFunction *" exists.//Cutter
code#include #include #include #include #include #include #include #include
#include #include #include #include #include #include #include #include
#include #include #include #include class SphereCallback : public
vtkCommand{public:	static SphereCallback *New()	{		return new
SphereCallback;	}	SphereCallback() {}	virtual void Execute(vtkObject
*caller, unsigned long, void*)	{		vtkSphereWidget *sphereWidget =		
reinterpret_cast<vtkSphereWidget*>(caller);		double center[3];	
sphereWidget->GetCenter(center);		std::cout << "Center: " << center[0] << "
" << center[1] << " " << center[2] << std::endl;	}};int main(int, char *[]){
//nuskaitymas	vtkSmartPointer reader = vtkSmartPointer::New();
reader->SetFileName("Models\\carotid.vtk");	reader->Update();
vtkSmartPointer carotidMapper = vtkSmartPointer::New();
carotidMapper->SetInputConnection(reader->GetOutputPort());	//Create carotid
actor	vtkSmartPointer carotidActor =		vtkSmartPointer::New();
carotidActor->GetProperty()->SetOpacity(0.5);
carotidActor->SetMapper(carotidMapper);	//Creating plane to cut this
majestic peace of model	vtkSmartPointer sphereC =		vtkSmartPointer::New();
sphereC->SetXLength(40);	sphereC->SetYLength(30);	sphereC->SetZLength(20);
sphereC->SetOrigin(20, 0, 0);	// Create carotid cutter	vtkSmartPointer
cutterC =		vtkSmartPointer::New();	cutterC->SetCutFunction(sphereC);
cutterC->SetInputConnection(reader->GetOutputPort());	cutterC->Update();
vtkSmartPointer cutterMapperC =		vtkSmartPointer::New();
cutterMapperC->SetInputConnection(cutterC->GetOutputPort());	//
vtkSmartPointer cube =		vtkSmartPointer::New();	cube->SetXLength(40);
cube->SetYLength(30);	cube->SetZLength(20);	vtkSmartPointer cubeMapper =	
vtkSmartPointer::New();
cubeMapper->SetInputConnection(cube->GetOutputPort());	// Create a plane to
cut,here it cuts in the XZ direction (xz normal=(1,0,0);XY =(0,0,1),YZ
=(0,1,0)	vtkSmartPointer plane =		vtkSmartPointer::New();
plane->SetOrigin(10, 0, 0);	plane->SetNormal(1, 0, 0);	// Create cutter
vtkSmartPointer cutter =		vtkSmartPointer::New();
cutter->SetCutFunction(plane);
cutter->SetInputConnection(cube->GetOutputPort());	cutter->Update();
vtkSmartPointer cutterMapper =		vtkSmartPointer::New();
cutterMapper->SetInputConnection(cutter->GetOutputPort());	// Create plane
actor	vtkSmartPointer planeActor =		vtkSmartPointer::New();
planeActor->GetProperty()->SetColor(1.0, 1, 0);
planeActor->GetProperty()->SetLineWidth(2);
planeActor->SetMapper(cutterMapper);		//Create second plane actor	
vtkSmartPointer planeActor2 =			vtkSmartPointer::New();	
planeActor2->GetProperty()->SetColor(1.0, 1, 0);	
planeActor2->GetProperty()->SetLineWidth(2);	
planeActor2->SetMapper(cutterMapper2);		//Create carotid actor	
vtkSmartPointer carotidPlaneActor =			vtkSmartPointer::New();	
carotidPlaneActor ->GetProperty()->SetColor(1.0, 1, 0);	
carotidPlaneActor->GetProperty()->SetLineWidth(2);	
carotidPlaneActor->SetMapper(cutterMapperC);	// Create cube actor
vtkSmartPointer cubeActor =		vtkSmartPointer::New();
cubeActor->GetProperty()->SetColor(0.5, 1, 0.5);
cubeActor->GetProperty()->SetOpacity(0.5);	cubeActor->SetMapper(cubeMapper);
// Create renderers and add actors of plane and cube	vtkSmartPointer
renderer =		vtkSmartPointer::New();	renderer->AddActor(planeActor);
//display the rectangle resulting from the cut
renderer->AddActor(cubeActor); //display the cube
renderer->AddActor(carotidActor); //display carotid
renderer->AddActor(planeActor2); //display rectangle of second cut
renderer->AddActor(carotidPlaneActor); //display rectangle of carotid cut	//
Add renderer to renderwindow and render	vtkSmartPointer renderWindow =	
vtkSmartPointer::New();	renderWindow->AddRenderer(renderer);		//Sphere
widget interactor		// An interactor		vtkSmartPointer renderWindowInteractor
=			vtkSmartPointer::New();	
renderWindowInteractor->SetRenderWindow(renderWindow);		vtkSmartPointer
sphereWidget = vtkSmartPointer::New();	
sphereWidget->SetInteractor(renderWindowInteractor);	
sphereWidget->SetRepresentationToWireframe();	
sphereWidget->SetProp3D(carotidActor);		sphereWidget->SetPlaceFactor(0.5);	
sphereWidget->PlaceWidget();		vtkSmartPointer cutter2 =		
vtkSmartPointer::New();		cutter2->SetCutFunction(sphereWidget);	
cutter2->SetInputConnection(cube->GetOutputPort());		cutter2->Update();	
vtkSmartPointer cutterMapper2 =			vtkSmartPointer::New();	
cutterMapper2->SetInputConnection(cutter2->GetOutputPort());	
sphereWidget->SetInteractor(renderWindowInteractor);	
sphereWidget->SetRepresentationToSurface();		vtkSmartPointer sphereCallback
=			vtkSmartPointer::New();	
sphereWidget->AddObserver(vtkCommand::InteractionEvent, sphereCallback);
renderWindow->SetSize(600, 600);
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->SetBackground(0, 0, 0);	renderWindow->Render();		//sphere widget
interactor		renderWindowInteractor->Initialize();		renderWindow->Render();	
sphereWidget->On();		renderWindowInteractor->Start();	return
EXIT_SUCCESS;}Any suggestions would be highly appreciated.



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