VTK 二维 外部轮廓线绘制

有时我们需求，三维的轮廓线

 

 可以用来做什么，自己想一下；

#include 
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int main(int argc, char* argv[])
{
	vtkNew colors;

	vtkNew data3d;

	//if (argc > 1)
	//{
	//	vtkNew reader;
	//	reader->SetFileName(argv[1]);
	//	reader->Update();

	//	data3d = reader->GetOutput();
	//}
	//else
	//{
	//	vtkNew source;
	//	source->SetCenter(0.0, 0.0, 5.0);
	//	source->SetRadius(2.0);
	//	source->SetPhiResolution(20.);
	//	source->SetThetaResolution(20.);
	//	source->Update();

	//	data3d = source->GetOutput();
	//}

	std::string inputFilename = "E:/leftlumen.stl";

	vtkSmartPointer reader = vtkSmartPointer::New();
	reader->SetFileName(inputFilename.c_str());
	reader->Update();
 


	data3d->DeepCopy( reader->GetOutput());
	vtkSmartPointer pTransform = vtkSmartPointer::New();
	pTransform->RotateX(90);//x轴旋转90度
	//pTransform->RotateZ(180);//z轴旋转180度
	pTransform->Update();
	vtkSmartPointer pTransformPolyDataFilter = vtkSmartPointer::New();
	pTransformPolyDataFilter->SetInputData(data3d);
	pTransformPolyDataFilter->SetTransform(pTransform);
	pTransformPolyDataFilter->Update();
 

	data3d->DeepCopy(pTransformPolyDataFilter->GetOutput());

	double bounds_data[6], center_data[3];
	data3d->GetBounds(bounds_data);
	data3d->GetCenter(center_data);


	// Black and white scene with the data in order to print the view
	vtkNew mapper_data;
	mapper_data->SetInputData(data3d);

	vtkNew actor_data;
	actor_data->SetMapper(mapper_data);
	actor_data->GetProperty()->SetColor(colors->GetColor3d("Black").GetData());

	vtkNew tmp_rend;
	tmp_rend->SetBackground(colors->GetColor3d("WHite").GetData());

	tmp_rend->AddActor(actor_data);
	tmp_rend->ResetCamera();
	tmp_rend->GetActiveCamera()->SetParallelProjection(1);

	vtkNew tmp_rW;
	tmp_rW->SetOffScreenRendering(1);
	tmp_rW->AddRenderer(tmp_rend);

	tmp_rW->Render();

	// Get a print of the window
	vtkNew windowToImageFilter;
	windowToImageFilter->SetInput(tmp_rW);
#if VTK_MAJOR_VERSION >= 8 || VTK_MAJOR_VERSION == 8 && VTK_MINOR_VERSION >= 90
	windowToImageFilter->SetScale(2); // image quality
#else
	windowToImageFilter->SetMagnification(2); // image quality
#endif
	windowToImageFilter->Update();

	// Extract the silhouette corresponding to the black limit of the image
	vtkNew ContFilter;
	ContFilter->SetInputConnection(windowToImageFilter->GetOutputPort());
	ContFilter->SetValue(0, 255);
	ContFilter->Update();

	// Make the contour coincide with the data.
	vtkSmartPointer contour = ContFilter->GetOutput();

	double bounds_contour[6], center_contour[3];
	double trans_x = 0., trans_y = 0., trans_z = 0., ratio_x = 0., ratio_y = 0.;
	contour->GetBounds(bounds_contour);

	ratio_x = (bounds_data[1] - bounds_data[0]) /
		(bounds_contour[1] - bounds_contour[0]);
	ratio_y = (bounds_data[3] - bounds_data[2]) /
		(bounds_contour[3] - bounds_contour[2]);

	// Rescale the contour so that it shares the same bounds as the
	// input data
	vtkNew transform1;
	transform1->Scale(ratio_x, ratio_y, 1.0);

	vtkNew tfilter1;
	tfilter1->SetInputData(contour);
	tfilter1->SetTransform(transform1);
	tfilter1->Update();

	contour = tfilter1->GetOutput();

	// Translate the contour so that it shares the same center as the
	// input data
	contour->GetCenter(center_contour);
	trans_x = center_data[0] - center_contour[0];
	trans_y = center_data[1] - center_contour[1];
	trans_z = center_data[2] - center_contour[2];

	vtkNew transform2;
	transform2->Translate(trans_x, trans_y, trans_z);

	vtkNew tfilter2;
	tfilter2->SetInputData(contour);
	tfilter2->SetTransform(transform2);
	tfilter2->Update();

	contour = tfilter2->GetOutput();

	// Render the result : Input data + resulting silhouette

	// Updating the color of the data
	actor_data->GetProperty()->SetColor(
		colors->GetColor3d("MistyRose").GetData());

	// Create a mapper and actor of the silhouette
	vtkNew mapper_contour;
	mapper_contour->SetInputData(contour);

	vtkNew actor_contour;
	actor_contour->SetMapper(mapper_contour);
	actor_contour->GetProperty()->SetLineWidth(2.0);

	// 2 renderers and a render window
	vtkNew renderer1;
	renderer1->AddActor(actor_data);

	vtkNew renderer2;
	renderer2->AddActor(actor_contour);

	vtkNew renderwindow;
	renderwindow->SetSize(400, 400);
	renderwindow->SetWindowName("ExternalContour");
	renderwindow->AddRenderer(renderer1);

	renderer1->SetViewport(0.0, 0.0, 0.5, 1.0);
	renderer1->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());

	renderwindow->AddRenderer(renderer2);
	renderer2->SetViewport(0.5, 0.0, 1.0, 1.0);
	renderer2->SetBackground(colors->GetColor3d("MidnightBlue").GetData());

	vtkNew style;
	vtkNew iren;

	iren->SetRenderWindow(renderwindow);
	iren->SetInteractorStyle(style);

	renderwindow->Render();
	iren->Start();

	return EXIT_SUCCESS;
}