VS+QT+VTK 3D grid display-point surface selection-normal vector display-registration-split window program

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VS+QT+VTK 3D grid display-point surface selection-normal vector display-registration-split window program

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This blog writes code for <<VS+QT+VTK 3D grid display-point surface selection-normal vector display-registration-split window program>>, the code is neat, regular and easy to read. The first choice for learning and application recommendation.

Function: read 3D mesh data, including *.obj, *.stl, *.off, highlight single vertex and multiple vertices and single face and face normal by clicking the mesh surface, display with/without The grid data of the wireframe, displaying the number of points, faces and edges, the realization of ICP algorithm and semi-automatic segmentation algorithm .

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Article directory

1. Required tool software

2. Use steps

        1. Import library

        2. Code implementation

        3. Running results

3. Online assistance

1. Required tool software

1. VS, Qt

2. VTK

2. Use steps

1. Import library

#include <QtCore/QStringList>
#include <QtWidgets/QFileDialog>
#include <QtWidgets/QMessageBox>

#include <vtkAppendPolyData.h>
#include <vtkCellData.h>
#include <vtkExtractEdges.h>
#include <vtkIdTypeArray.h>
#include <vtkMath.h>
#include <vtkLineSource.h>
#include <vtkLookupTable.h>
#include <vtkMatrix4x4.h>
#include <vtkNew.h>
#include <vtkOBJReader.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkScalarBarActor.h>
#include <vtkSphereSource.h>
#include <vtkSTLReader.h>
#include <vtkTransform.h>
#include <vtkTransformPolyDataFilter.h>

#include <iomanip>
#include <sstream>

#include "icp_algorithm.h"
#include "mesh_operation.h"
#include "mesh_segmenter.h"
#include "vtkOFFReader.h"

2. Code implementation

code show as below:

void MeshProcessing::OnWireframeMode() {
	bool isChecked = this->wireframe_mode_action_->isChecked();
	for (auto actor : this->mesh_processing_data_model_->wireframe_actor_vec_)
		actor->SetVisibility(isChecked);
	this->vtk_widget_->update();
}

void MeshProcessing::OnObserveMode() {
	this->removeVertexActors();
	this->removeFaceActors();
	this->removeMultiVertexActors();
	this->removeFillRegionFaceActors();
	this->mesh_processing_data_model_->pick_mode_ = MeshProcessingDataModel::OBSERVE;
	this->vtk_widget_->updateTopText();
}

void MeshProcessing::OnVertexMode() {
	this->removeFaceActors();
	this->removeMultiVertexActors();
	this->removeFillRegionFaceActors();
	this->mesh_processing_data_model_->pick_mode_ = MeshProcessingDataModel::VERTEX;
	this->vtk_widget_->updateTopText();
}

void MeshProcessing::OnFaceMode() {
	this->removeVertexActors();
	this->removeMultiVertexActors();
	this->removeFillRegionFaceActors();
	this->mesh_processing_data_model_->pick_mode_ = MeshProcessingDataModel::FACE;
	this->vtk_widget_->updateTopText();
}

void MeshProcessing::OnMultiVertexMode() {
	this->removeVertexActors();
	this->removeFaceActors();
	this->removeFillRegionFaceActors();
	this->mesh_processing_data_model_->pick_mode_ = MeshProcessingDataModel::MULTI_VERTEX;
	this->vtk_widget_->updateTopText();
}

void MeshProcessing::OnDisplayNormal() {
	if (this->mesh_processing_data_model_->pick_mode_ != MeshProcessingDataModel::FACE ||
		this->mesh_processing_data_model_->selected_face_id_ == -1) {
		QMessageBox::warning(this, QString::fromLocal8Bit("警告"), QString::fromLocal8Bit("请在面拾取模式中选取一个面片！"));
		return;
	}

	int cellId = this->mesh_processing_data_model_->selected_face_id_;
	vtkCell * cell = this->mesh_processing_data_model_->combined_mesh_->GetCell(cellId);

	double p0[3], p1[3], p2[3];
	this->mesh_processing_data_model_->combined_mesh_->GetPoint(cell->GetPointId(0), p0);
	this->mesh_processing_data_model_->combined_mesh_->GetPoint(cell->GetPointId(1), p1);
	this->mesh_processing_data_model_->combined_mesh_->GetPoint(cell->GetPointId(2), p2);

	double c[3];
	for (int i = 0; i < 3; ++i) c[i] = (p0[i] + p1[i] + p2[i]) / 3;

	double p0p1[3], p0p2[3];
	vtkMath::Subtract(p1, p0, p0p1);
	vtkMath::Subtract(p2, p0, p0p2);

	double normal[3];
	vtkMath::Cross(p0p1, p0p2, normal);
	vtkMath::Normalize(normal);

	double constant = (
		std::sqrt(vtkMath::Distance2BetweenPoints(p0, p1)) +
		std::sqrt(vtkMath::Distance2BetweenPoints(p1, p2)) +
		std::sqrt(vtkMath::Distance2BetweenPoints(p2, p0))
	);
	double e[3];
	for (int i = 0; i < 3; ++i) e[i] = c[i] + constant * normal[i];

	vtkSmartPointer<vtkLineSource> lineSource =
		vtkSmartPointer<vtkLineSource>::New();
	lineSource->SetPoint1(c);
	lineSource->SetPoint2(e);
	lineSource->Update();

	this->mesh_processing_data_model_->selected_face_normal_actor_ = this->vtk_widget_->addActor(lineSource->GetOutput());
	this->mesh_processing_data_model_->selected_face_normal_actor_->GetProperty()->SetColor(.8, .8, .2);
	this->mesh_processing_data_model_->selected_face_normal_actor_->GetProperty()->SetLineWidth(5);

	this->vtk_widget_->update();
}

void MeshProcessing::OnDefaultMode() {
	this->mesh_processing_data_model_->display_mode_ = MeshProcessingDataModel::DEFAULT;
	if (this->mesh_processing_data_model_->highlight_vec_[0] == 1)
		this->vtk_widget_->highlightMesh(this->mesh_processing_data_model_->actor_vec_[0]);
	else
		this->vtk_widget_->unhighlightMesh(this->mesh_processing_data_model_->actor_vec_[0]);
	this->vtk_widget_->update();
}

void MeshProcessing::OnDiscreteMode() {
	if (this->mesh_processing_data_model_->actor_vec_.size() != 1) {
		QMessageBox::critical(this, QString::fromLocal8Bit("错误"), QString::fromLocal8Bit("请检查目前读入的网格数是否为1！"));
		return;
	}

	this->mesh_processing_data_model_->display_mode_ = MeshProcessingDataModel::DISCRETE;
	this->mesh_processing_data_model_->mesh_vec_[0] = this->color_table_handler_->turnToDiscrete();

	this->mesh_processing_data_model_->hueLut = vtkSmartPointer<vtkLookupTable>::New();
	this->mesh_processing_data_model_->hueLut->SetNumberOfTableValues(this->color_table_handler_->maxScalar() - this->color_table_handler_->minScalar() + 1);
	this->mesh_processing_data_model_->hueLut->Build();

	for (int i = 0; i < this->color_table_handler_->maxScalar() - this->color_table_handler_->minScalar() + 1; ++i) {
		double hue = i * 1.0 / (this->color_table_handler_->maxScalar() - this->color_table_handler_->minScalar() + 1);
		double r, g, b;
		vtkMath::HSVToRGB(hue, 1.0, 1.0, &r, &g, &b);
		this->mesh_processing_data_model_->hueLut->SetTableValue(i, r, g, b, 1);
	}

	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetScalarRange(0, this->color_table_handler_->maxScalar() - this->color_table_handler_->minScalar() + 1);
	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetScalarModeToUseCellData();
	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetColorModeToMapScalars();
	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetLookupTable(this->mesh_processing_data_model_->hueLut);

	if (this->mesh_processing_data_model_->highlight_vec_[0] == 1)
		this->vtk_widget_->highlightMesh(this->mesh_processing_data_model_->actor_vec_[0]);
	else
		this->vtk_widget_->unhighlightMesh(this->mesh_processing_data_model_->actor_vec_[0]);
	this->vtk_widget_->update();
}

void MeshProcessing::OnContinuousMode() {
	if (this->mesh_processing_data_model_->actor_vec_.size() != 1) {
		QMessageBox::critical(this, QString::fromLocal8Bit("错误"), QString::fromLocal8Bit("请检查目前读入的网格数是否为1！"));
		return;
	}

	this->mesh_processing_data_model_->display_mode_ = MeshProcessingDataModel::CONTINUOUS;
	this->mesh_processing_data_model_->mesh_vec_[0] = this->color_table_handler_->turnToContinuous();

	this->mesh_processing_data_model_->hueLut = vtkSmartPointer<vtkLookupTable>::New();
	this->mesh_processing_data_model_->hueLut->SetTableRange(this->color_table_handler_->minScalar(), this->color_table_handler_->maxScalar() + 1);
	this->mesh_processing_data_model_->hueLut->SetHueRange(0, 1);
	this->mesh_processing_data_model_->hueLut->SetSaturationRange(1, 1);
	this->mesh_processing_data_model_->hueLut->SetValueRange(1, 1);
	this->mesh_processing_data_model_->hueLut->Build();

	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetScalarRange(this->color_table_handler_->minScalar(), this->color_table_handler_->maxScalar() + 1);
	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetScalarModeToUseCellData();
	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetColorModeToMapScalars();
	this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->SetLookupTable(this->mesh_processing_data_model_->hueLut);

	if (this->mesh_processing_data_model_->highlight_vec_[0] == 1)
		this->vtk_widget_->highlightMesh(this->mesh_processing_data_model_->actor_vec_[0]);
	else
		this->vtk_widget_->unhighlightMesh(this->mesh_processing_data_model_->actor_vec_[0]);
	this->vtk_widget_->update();
}

void MeshProcessing::OnICPRegistration() {
	std::vector<int> active_ids;
	for (int i = 0; i < this->mesh_processing_data_model_->highlight_vec_.size(); ++i) {
		if (this->mesh_processing_data_model_->highlight_vec_[i])
			active_ids.push_back(i);
	}

	if (active_ids.size() != 2) {
		QMessageBox::warning(this, QString::fromLocal8Bit("警告"), QString::fromLocal8Bit("请检查目前选中的网格数是否为2！"));
		return;
	}

	this->wireframe_mode_action_->setChecked(false);
	OnWireframeMode();
	this->disableAllActions();
	this->OnObserveMode();
	this->register_scroll_area_->setVisible(true);

	this->mesh_processing_data_model_->source_id = active_ids.front();
	this->mesh_processing_data_model_->target_id = active_ids.back();

	this->mesh_processing_data_model_->actor_vec_[this->mesh_processing_data_model_->target_id]->GetProperty()->SetColor(.8, .2, .2);
	this->vtk_widget_->update();

	this->tab_widget_->setTabEnabled(0, false);
	this->tab_widget_->setTabEnabled(1, true);
	this->tab_widget_->setCurrentIndex(1);
}

void MeshProcessing::OnSegment() {
	if (this->mesh_processing_data_model_->mesh_vec_.size() != 1) {
		QMessageBox::critical(this, QString::fromLocal8Bit("错误"), QString::fromLocal8Bit("请检查目前读入的网格数是否为1！"));
		return;
	}

	this->wireframe_mode_action_->setChecked(false);
	OnWireframeMode();
	this->disableAllActions();
	this->OnObserveMode();

	if (this->color_table_handler_ != nullptr) {
		this->default_mode_action_->setEnabled(false);
		this->discrete_mode_action_->setEnabled(false);
		this->continuous_mode_action_->setEnabled(false);
		this->OnDefaultMode();
	}

	this->segment_scroll_area_->setVisible(true);
	this->cluster_num_slider_->setEnabled(false);

	this->mesh_processing_data_model_->segment_id = 0;

	this->tab_widget_->setTabEnabled(0, false);
	this->tab_widget_->setTabEnabled(1, true);
	this->tab_widget_->setCurrentIndex(1);
}

void MeshProcessing::OnFillRegionThreeVertices() {
	this->removeFillRegionFaceActors();

	for (int i = 0; i < this->mesh_processing_data_model_->combined_mesh_->GetNumberOfCells(); ++i) {
		vtkSmartPointer<vtkIdList> ptIds =
			vtkSmartPointer<vtkIdList>::New();
		this->mesh_processing_data_model_->combined_mesh_->GetCellPoints(i, ptIds);

		int validNum = 0;
		for (int k = 0; k < 3; ++k)
			validNum += this->mesh_processing_data_model_->selected_multi_vertex_set_.find(ptIds->GetId(k)) != this->mesh_processing_data_model_->selected_multi_vertex_set_.end() ? 1 : 0;

		if (validNum == 3) {
			this->mesh_processing_data_model_->fill_region_face_actor_vec_.push_back(this->vtk_widget_->highlightFace(this->mesh_processing_data_model_->combined_mesh_, i));
			this->mesh_processing_data_model_->fill_region_face_actor_vec_.back()->GetProperty()->SetColor(.8, .8, .2);
		}
	}

	this->vtk_widget_->update();
}

void MeshProcessing::OnFillRegionTwoVertices() {
	this->removeFillRegionFaceActors();

	for (int i = 0; i < this->mesh_processing_data_model_->combined_mesh_->GetNumberOfCells(); ++i) {
		vtkSmartPointer<vtkIdList> ptIds =
			vtkSmartPointer<vtkIdList>::New();
		this->mesh_processing_data_model_->combined_mesh_->GetCellPoints(i, ptIds);

		int validNum = 0;
		for (int k = 0; k < 3; ++k)
			validNum += this->mesh_processing_data_model_->selected_multi_vertex_set_.find(ptIds->GetId(k)) != this->mesh_processing_data_model_->selected_multi_vertex_set_.end() ? 1 : 0;

		if (validNum >= 2) {
			this->mesh_processing_data_model_->fill_region_face_actor_vec_.push_back(this->vtk_widget_->highlightFace(this->mesh_processing_data_model_->combined_mesh_, i));
			this->mesh_processing_data_model_->fill_region_face_actor_vec_.back()->GetProperty()->SetColor(.8, .8, .2);
		}
	}

	this->vtk_widget_->update();
}

void MeshProcessing::OnListWidgetModelItemChanged(QListWidgetItem * item) {
	int row_id = this->list_widget_model_->row(item);

	if (item->checkState() == Qt::Unchecked) {
		this->vtk_widget_->unhighlightMesh(this->mesh_processing_data_model_->actor_vec_[row_id]);
		this->mesh_processing_data_model_->highlight_vec_[row_id] = 0;
	} else {
		this->vtk_widget_->highlightMesh(this->mesh_processing_data_model_->actor_vec_[row_id]);
		this->mesh_processing_data_model_->highlight_vec_[row_id] = 1;
	}

	this->resetParameters();

	this->vtk_widget_->update();
}

void MeshProcessing::OnRunICP() {
	ICPAlgorithm icp;
	icp.setSource(this->mesh_processing_data_model_->mesh_vec_[this->mesh_processing_data_model_->source_id]);
	icp.setTarget(this->mesh_processing_data_model_->mesh_vec_[this->mesh_processing_data_model_->target_id]);
	if (this->move_center_radio_button_->isChecked())
		icp.moveCenterOn();
	else
		icp.moveCenterOff();
	icp.setMaxIter(this->max_iter_spin_box_->value());
	icp.setMinError(this->min_error_double_spin_box_->value());
	icp.registration();

	vtkMatrix4x4 * transform_matrix = icp.getTransformMatrix();
	
	std::ostringstream oss;
	oss << setprecision(2);
	for (int i = 0; i < 4; ++i) {
		for (int j = 0; j < 4; ++j) oss << transform_matrix->GetElement(i, j) << "\t";
		oss << std::endl;
	}

	this->iter_num_label_->setText(QString::number(icp.getIterNum()));
	this->error_label_->setText(QString::number(icp.getError()));
	this->matrix_label_->setText(QString::fromStdString(oss.str()));

	vtkSmartPointer<vtkTransform> transform =
		vtkSmartPointer<vtkTransform>::New();
	transform->SetMatrix(transform_matrix);
	transform->Update();

	vtkNew<vtkTransformPolyDataFilter> transformFilter;
	transformFilter->SetInputData(this->mesh_processing_data_model_->mesh_vec_[0]);
	transformFilter->SetTransform(transform);
	transformFilter->Update();

	vtkPolyDataMapper * mapper = vtkPolyDataMapper::SafeDownCast(this->mesh_processing_data_model_->actor_vec_[0]->GetMapper());
	mapper->SetInputData(transformFilter->GetOutput());

	this->vtk_widget_->resetCamera();
	this->vtk_widget_->update();
}

void MeshProcessing::OnExitICP() {
	this->tab_widget_->setTabEnabled(0, true);
	this->tab_widget_->setTabEnabled(1, false);
	this->tab_widget_->setCurrentIndex(0);

	this->iter_num_label_->setText("");
	this->error_label_->setText("");
	this->matrix_label_->setText("");

	this->enableAllActions();

	this->mesh_processing_data_model_->mesh_vec_[0]->DeepCopy(this->mesh_processing_data_model_->actor_vec_[0]->GetMapper()->GetInput());
	this->mesh_processing_data_model_->actor_vec_[this->mesh_processing_data_model_->target_id]->GetProperty()->SetColor(.0, .5, 1.);
	this->vtk_widget_->update();

	this->register_scroll_area_->setVisible(false);
	this->resetParameters();
}

void MeshProcessing::OnCancelICP() {
	this->tab_widget_->setTabEnabled(0, true);
	this->tab_widget_->setTabEnabled(1, false);
	this->tab_widget_->setCurrentIndex(0);

	this->iter_num_label_->setText("");
	this->error_label_->setText("");
	this->matrix_label_->setText("");

	this->enableAllActions();

	vtkPolyDataMapper * mapper = vtkPolyDataMapper::SafeDownCast(this->mesh_processing_data_model_->actor_vec_[0]->GetMapper());
	mapper->SetInputData(this->mesh_processing_data_model_->mesh_vec_[0]);

	this->mesh_processing_data_model_->actor_vec_[this->mesh_processing_data_model_->target_id]->GetProperty()->SetColor(.0, .5, 1.);
	this->vtk_widget_->update();

	this->register_scroll_area_->setVisible(false);
	this->resetParameters();
}

void MeshProcessing::OnClusterNumChanged(int n) {
	using std::vector;

	this->color_table_handler_ = new ColorTableHandler;
	this->color_table_handler_->setMesh(this->mesh_processing_data_model_->mesh_vec_[this->mesh_processing_data_model_->segment_id]);

	vector<double> color_value_vec;
	vtkSmartPointer<vtkDoubleArray> scalars = this->mesh_processing_data_model_->mesh_segmenter_->getSegmentScalar(n);
	this->mesh_processing_data_model_->mesh_vec_[this->mesh_processing_data_model_->segment_id]->GetCellData()->SetScalars(scalars);
	for (int i = 0; i < scalars->GetNumberOfValues(); ++i)
		color_value_vec.push_back(scalars->GetValue(i));
	this->color_table_handler_->readColorValueVec(color_value_vec);

	this->OnDiscreteMode();
}

void MeshProcessing::OnRunSegment() {
	this->mesh_processing_data_model_->mesh_segmenter_ = new MeshSegmenter(this->seed_num_spin_box_->value(), this->phy_ratio_double_spin_box_->value());
	this->mesh_processing_data_model_->mesh_segmenter_->vtk_widget_ = this->vtk_widget_;
	this->mesh_processing_data_model_->mesh_segmenter_->setMesh(this->mesh_processing_data_model_->mesh_vec_[this->mesh_processing_data_model_->segment_id]);
	this->mesh_processing_data_model_->mesh_segmenter_->segment();

	this->cluster_num_slider_->setEnabled(true);
	this->cluster_num_slider_->setValue(2);
	this->OnClusterNumChanged(2);

	this->cluster_num_slider_->setMinimum(2);
	this->cluster_num_slider_->setMaximum(this->seed_num_spin_box_->value());
}

void MeshProcessing::OnExitSegment() {
	using std::vector;

	this->tab_widget_->setTabEnabled(0, true);
	this->tab_widget_->setTabEnabled(1, false);
	this->tab_widget_->setCurrentIndex(0);

	this->iter_num_label_->setText("");
	this->error_label_->setText("");
	this->matrix_label_->setText("");

	this->enableAllActions();

	this->default_mode_action_->setEnabled(true);
	this->discrete_mode_action_->setEnabled(true);
	this->continuous_mode_action_->setEnabled(true);

	this->segment_scroll_area_->setVisible(false);
	this->resetParameters();
}

void MeshProcessing::OnCancelSegment() {
	this->tab_widget_->setTabEnabled(0, true);
	this->tab_widget_->setTabEnabled(1, false);
	this->tab_widget_->setCurrentIndex(0);

	this->iter_num_label_->setText("");
	this->error_label_->setText("");
	this->matrix_label_->setText("");

	this->enableAllActions();

	this->default_mode_action_->setEnabled(false);
	this->discrete_mode_action_->setEnabled(false);
	this->continuous_mode_action_->setEnabled(false);

	this->mesh_processing_data_model_->combined_mesh_->GetCellData()->SetScalars(nullptr);
	this->mesh_processing_data_model_->actor_vec_[this->mesh_processing_data_model_->segment_id]->GetProperty()->SetColor(.0, .5, 1.);
	this->mesh_processing_data_model_->actor_vec_[this->mesh_processing_data_model_->segment_id]->GetMapper()->ScalarVisibilityOff();
	this->vtk_widget_->update();

	this->segment_scroll_area_->setVisible(false);
	this->resetParameters();
}

void MeshProcessing::OnSelectVertex(vtkIdType id) {
	if (id == -1) return;

	this->removeVertexActors();

	this->mesh_processing_data_model_->selected_vertex_actor_ = this->vtk_widget_->highlightVertex(this->mesh_processing_data_model_->combined_mesh_, id);
	this->mesh_processing_data_model_->selected_vertex_actor_->GetProperty()->SetInterpolationToGouraud();
	this->mesh_processing_data_model_->selected_vertex_actor_->GetProperty()->SetColor(.8, .2, .2);

	auto neighborVertexIds = MeshOperation::getConnectedVertices(this->mesh_processing_data_model_->combined_mesh_, id);
	for (const auto & neighbor : neighborVertexIds) {
		this->mesh_processing_data_model_->neighbor_vertex_actor_vec_.push_back(this->vtk_widget_->highlightVertex(this->mesh_processing_data_model_->combined_mesh_, neighbor));
		this->mesh_processing_data_model_->neighbor_vertex_actor_vec_.back()->GetProperty()->SetInterpolationToGouraud();
		this->mesh_processing_data_model_->neighbor_vertex_actor_vec_.back()->GetProperty()->SetColor(.8, .8, .2);
	}

	auto neighborFaceIds = MeshOperation::getVertexConnectedFaces(this->mesh_processing_data_model_->combined_mesh_, id);
	for (const auto & neighbor : neighborFaceIds) {
		this->mesh_processing_data_model_->neighbor_face_actor_vec_.push_back(this->vtk_widget_->highlightFace(this->mesh_processing_data_model_->combined_mesh_, neighbor));
		this->mesh_processing_data_model_->neighbor_face_actor_vec_.back()->GetProperty()->SetColor(.8, .5, .2);
	}

	this->vtk_widget_->update();
}

void MeshProcessing::OnSelectFace(vtkIdType id) {
	if (id == -1) return;

	this->removeFaceActors();

	this->mesh_processing_data_model_->selected_face_actor_ = this->vtk_widget_->highlightFace(this->mesh_processing_data_model_->combined_mesh_, id);
	this->mesh_processing_data_model_->selected_face_actor_->GetProperty()->SetColor(.8, .2, .2);

	auto neighborFaceIds = MeshOperation::getFaceConnectedFaces(this->mesh_processing_data_model_->combined_mesh_, id);
	for (const auto & neighbor : neighborFaceIds) {
		this->mesh_processing_data_model_->neighbor_face2_actor_vec_.push_back(this->vtk_widget_->highlightFace(this->mesh_processing_data_model_->combined_mesh_, neighbor));
		this->mesh_processing_data_model_->neighbor_face2_actor_vec_.back()->GetProperty()->SetColor(.8, .8, .2);
	}

	this->mesh_processing_data_model_->selected_face_id_ = id;

	this->vtk_widget_->update();
}

void MeshProcessing::OnSelectMultiVertex(const std::vector<vtkIdType>& ids) {
	this->removeMultiVertexActors();

	this->mesh_processing_data_model_->selected_multi_vertex_set_.clear();
	for (const auto & id : ids) {
		this->mesh_processing_data_model_->selected_multi_vertex_actor_vec_.push_back(this->vtk_widget_->highlightVertex(this->mesh_processing_data_model_->combined_mesh_, id));
		this->mesh_processing_data_model_->selected_multi_vertex_actor_vec_.back()->GetProperty()->SetInterpolationToGouraud();
		this->mesh_processing_data_model_->selected_multi_vertex_actor_vec_.back()->GetProperty()->SetColor(.8, .2, .2);

		this->mesh_processing_data_model_->selected_multi_vertex_set_.insert(id);
	}

	this->vtk_widget_->update();
}

void MeshProcessing::resetParameters() {
	vtkSmartPointer<vtkAppendPolyData> appendFilter =
		vtkSmartPointer<vtkAppendPolyData>::New();
	int cnt = 0;
	int num_edges = 0;
	for (int i = 0; i < this->mesh_processing_data_model_->highlight_vec_.size(); ++i) {
		if (this->mesh_processing_data_model_->highlight_vec_[i]) {
			appendFilter->AddInputData(this->mesh_processing_data_model_->mesh_vec_[i]);
			num_edges += this->mesh_processing_data_model_->mesh_edge_vec_[i]->GetNumberOfLines();
			++cnt;
		}
	}
	if (cnt > 0) {
		appendFilter->Update();
		this->mesh_processing_data_model_->combined_mesh_ =
			vtkSmartPointer<vtkPolyData>::New();
		this->mesh_processing_data_model_->combined_mesh_->DeepCopy(appendFilter->GetOutput());

		vtkSmartPointer<vtkIdTypeArray> numberScalarArray =
			vtkSmartPointer<vtkIdTypeArray>::New();
		numberScalarArray->SetNumberOfComponents(1);
		numberScalarArray->SetName("number");
		numberScalarArray->SetNumberOfValues(this->mesh_processing_data_model_->combined_mesh_->GetNumberOfPoints());
		for (int i = 0; i < this->mesh_processing_data_model_->combined_mesh_->GetNumberOfPoints(); ++i)
			numberScalarArray->SetValue(i, i);

		this->mesh_processing_data_model_->combined_mesh_->GetPointData()->AddArray(numberScalarArray);

		int edge_count = 0;
		this->mesh_processing_data_model_->mean_edge_length = 0.0;
		for (int i = 0; i < this->mesh_processing_data_model_->highlight_vec_.size(); ++i) {
			if (this->mesh_processing_data_model_->highlight_vec_[i]) {
				this->mesh_processing_data_model_->mean_edge_length +=
					this->mesh_processing_data_model_->mesh_edge_vec_[i]->GetNumberOfLines() * this->mesh_processing_data_model_->mean_edge_length_vec_[i];
				edge_count += this->mesh_processing_data_model_->mesh_edge_vec_[i]->GetNumberOfLines();
			}
		}
		this->mesh_processing_data_model_->mean_edge_length /= edge_count;

		this->vtk_widget_->updateBottomText(
			this->mesh_processing_data_model_->combined_mesh_->GetNumberOfPoints(),
			this->mesh_processing_data_model_->combined_mesh_->GetNumberOfCells(),
			num_edges
		);
	} else {
		this->mesh_processing_data_model_->combined_mesh_ = nullptr;
		this->mesh_processing_data_model_->mean_edge_length = 0.0;
		this->vtk_widget_->updateBottomText(
			0, 0, 0
		);
	}
}

3. Running results

face selection 

normal display 

 multiple selection

Registration 

3. Online assistance:

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