[vtkusers] vtkCutter->Update doesn't update the vtkCutter->GetOutput()

[nsarrasin]

Thanks for your reply,

I followed your advice and used GetOutputPort() but the result stays the
same.

I post a (light, simple and commented) code which illustrates the problem,
maybe i'm doing something wrong .

Thanks a lot for helping me.

//slicing of a sphere by a plane. the plane is iteratively rotated all
around the sphere

#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkTransform.h>
#include <vtkPlane.h>
#include <vtkCutter.h>
#include <vtkMath.h>
#include <vtkAppendPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSphereSource.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vector>

int main (int argc, char *argv[])
{
	//the object to cut
	vtkSphereSource* sph = vtkSphereSource::New();
	sph->SetRadius(25.);
	sph->SetPhiResolution(50.);
	sph->SetThetaResolution(50.);

	vtkPolyData *polydata = sph->GetOutput();

	//init the cutting plane
	double bounds[6], center[3];
	polydata->GetBounds(bounds);
	polydata->GetCenter(center);

	vtkPlane* plane = vtkPlane::New();
	plane->SetOrigin(center);
	plane->SetNormal(bounds[0]-center[0], bounds[2]-center[1], 0.);

	int nbsections = 10;
	double angle = 360./(double)nbsections;
	double normal[3]={0,0,1};

	//init the transformation
	vtkTransform* transf = vtkTransform::New();
	transf->RotateWXYZ(angle, normal[0], normal[1], normal[2]);

	vtkMatrix4x4* mat = vtkMatrix4x4::New();
	transf->GetMatrix(mat);

	vtkAppendPolyData* appdata = vtkAppendPolyData::New();
	vtkCutter* cutter = vtkCutter::New();
	cutter->SetInput(polydata);
	cutter->SetCutFunction(plane);

	double new_normal[4];

	for(int step=0; step<nbsections; step++)
	{
		//// Code works but need Update + DeppCopy
		cutter->Update();
		vtkPolyData* tmp_result=vtkPolyData::New();
		tmp_result->DeepCopy( cutter->GetOutput());
		appdata->AddInput(tmp_result);

		//// Code doesn't update though GetOutputPort()
		//appdata->AddInputConnection(cutter->GetOutputPort());
		
		//rotation of the cutting plane around normal
		mat->MultiplyPoint(plane->GetNormal(), new_normal);
		plane->SetNormal(new_normal);
		plane->SetOrigin(center);
	}

	//visualisation
	//1. All slices
	vtkSmartPointer<vtkPolyDataMapper> appmapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
	appmapper->SetInput(appdata->GetOutput());

	vtkSmartPointer<vtkActor> appactor = vtkSmartPointer<vtkActor>::New();
	appactor->SetMapper(appmapper);
	appactor->GetProperty()->SetColor(1,0,0);

	//2. polydata
	vtkSmartPointer<vtkPolyDataMapper> teethmapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
	teethmapper->SetInput(polydata);

	vtkSmartPointer<vtkActor> teethactor = vtkSmartPointer<vtkActor>::New();
	teethactor->SetMapper(teethmapper);
	teethactor->GetProperty()->SetColor(0.8,0.8,0.8);

	// The usual renderer, render window and interactor
	vtkSmartPointer<vtkRenderer> ren1 =	vtkSmartPointer<vtkRenderer>::New();
	vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
	vtkSmartPointer<vtkRenderWindowInteractor>	iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();

	ren1->SetBackground(.1, .2, .3);
	renWin->AddRenderer(ren1);
	iren->SetRenderWindow(renWin);

	ren1->AddActor(appactor);
	ren1->AddActor(teethactor);

	renWin->Render();
	iren->Start();
}

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