Vtk Qt场景与>50(移动)演员

Vtk Qt scene with >50 (moving) actors

本文关键字：移动 演员 gt Qt Vtk      更新时间：2023-10-16

我正在尝试实现(相当(简单的场景，其中我有~50个立方体向某些方向移动。立方体的位置每秒变化 20 次。

我的第一个拍摄是从场景中添加和删除演员。这种方法无法扩展。整个场景滞后，用户无法移动摄像机。

void draw(vtkRenderer *renderer)
{    
renderer->RemoveAllViewProps(); 
for(const Cube& cube : cubes_)
{
vtkSmartPointer<vtkCubeSource> cube_source = vtkSmartPointer<vtkCubeSource>::New();  
cube_source->Update();
cube_source->SetXLength(cube.lengt());
cube_source->SetYLength(cube.width());
cube_source->SetZLength(cube.height());
vtkSmartPointer<vtkPolyDataMapper> poly_mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
poly_mapper->SetInputConnection(cube_source->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(poly_mapper);
actor->SetPosition(cube.x(), cube.y(), cube.z());
renderer->AddActor(actor);
}
}

第二枪好一点。我创建了"演员池"，在那里我重复使用演员并隐藏不需要的演员。 尽管如此，移动相机还是滞后，我的其余 UI(我在 Vtk 小部件中有一些额外的小部件(似乎很滞后。

我找不到场景是"动态"的 Vtk 的任何相关来源。所有示例都预加载了所有场景元素并进一步处理它们。谁能告诉我我在这里做错了什么？

因此，经过几天的研究，我设法破解了工作解决方案：

vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
// as many points as you like
points->InsertNextPoint(-25, 0, 0);
points->InsertNextPoint(-35, 0, 0);

vtkSmartPointer<vtkFloatArray> scales = vtkSmartPointer<vtkFloatArray>::New();
scales->SetNumberOfComponents(3);
// same as number of points
scales->InsertNextTuple3(1, 1., 8.);
scales->InsertNextTuple3(1., 1., 10.);

vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(points);
polydata->GetPointData()->SetVectors(scales);
vtkSmartPointer<vtkCubeSource> cubeSource = vtkSmartPointer<vtkCubeSource>::New();
vtkSmartPointer<vtkGlyph3D> glyph3D = vtkSmartPointer<vtkGlyph3D>::New();
glyph3D->OrientOff(); // disable orientation
glyph3D->SetScaleModeToScaleByVectorComponents(); // sacle along each axis
glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
glyph3D->SetInputData(polydata);
glyph3D->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(glyph3D->GetOutputPort());
mapper->ScalarVisibilityOff(); // use color from actor
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->GetProperty()->SetColor(0, 1, 0); // this will change color for whole glyph
actor->SetMapper(mapper);
mapper->Update();
vtk_renderer->AddActor(actor);

上面的代码将添加尽可能多的立方体，您希望使用单个Actor！(在我的情况下，这是惊人的性能提升(

此外，如果要更新立方体的位置，只需执行以下操作：

points->Reset();
points->InsertNextPoint(-25, 0, 0);
points->InsertNextPoint(-35, 0, 0);
scales->Reset();
scales->InsertNextTuple3(1, 1., 8.);
scales->InsertNextTuple3(1., 1., 10.);
polydata_->Modified();
// call render

(请注意，我没有在场景中删除/添加演员，这是另一个提升(

这是我的可视化 VTK 示例

.....
vtkSmartPointer<vtkRenderer> m_vtkRenderer;
vtkSmartPointer<MouseInteractor> m_mouseInteractor;
QVector<vtkActor* > m_parcellationActors;
QVector<vtkActor* > m_electrodesActors;
QVector<vtkFollower* > m_textActors;
QVector<vtkActor*> m_vectorFieldsActors;
QVector<vtkActor*> m_streamlinesActors;
......
void VisualizationWidget::create3DViewArea()
{
m_3DViewArea = new QStackedWidget(this);
m_vtkWidget = new QVTKWidget(m_3DViewArea);
m_vtkRenderer = vtkSmartPointer<vtkRenderer>::New();
m_vtkRenderer->SetBackground(0.4, 0.4, 0.4);
this->m_vtkWidget->GetRenderWindow()->AddRenderer(m_vtkRenderer);
m_mouseInteractor = vtkSmartPointer<MouseInteractor>::New();
m_mouseInteractor ->SetDefaultRenderer(m_vtkRenderer);
this->m_vtkWidget->GetRenderWindow()->GetInteractor()->SetInteractorStyle( m_mouseInteractor);
connect(m_mouseInteractor, &MouseInteractor::onActorSelected, this, &VisualizationWidget::onActorSelectedSlot);
m_vtkLoadingWidget = new LoadingWidget(m_3DViewArea);
m_vtkLoadingWidget->setIconPath(Icon::s_getTDCSLoadingGif);
m_3DViewArea->addWidget(m_vtkLoadingWidget);
m_3DViewArea->addWidget(m_vtkWidget);
}

void VisualizationWidget::setParcellationActors(QVector<vtkActor*> actors)
{
m_parcellationActors = actors;
for (int i = 0; i < m_parcellationActors.size(); ++i) {
m_vtkRenderer->AddActor(m_parcellationActors.at(i));
}
m_vtkWidget->update();
}
void VisualizationWidget::setElectrodesActors(QVector<vtkActor*> actors)
{
m_electrodesActors = actors;
for (int i = 0; i < m_electrodesActors.size(); ++i) {
m_vtkRenderer->AddActor(m_electrodesActors.at(i));
}
m_vtkWidget->update();
}
void VisualizationWidget::setElectrodesLabelsActors(QVector<vtkFollower*> actors)
{
m_textActors = actors;
for (int i = 0; i < m_textActors.size(); ++i) {
m_textActors.at(i)->SetCamera(m_vtkRenderer->GetActiveCamera());
m_vtkRenderer->AddActor(m_textActors.at(i));
}
m_vtkRenderer->ResetCamera();
m_vtkWidget->update();
}
void VisualizationWidget::setVectorFieldsActors(QVector<vtkActor*> actors)
{
for (int i = 0; i < m_vectorFieldsActors.size(); ++i) {
m_vtkRenderer->RemoveActor(m_vectorFieldsActors.at(i));
}
m_vectorFieldsActors = actors;
for (int i = 0; i <  m_vectorFieldsActors.size(); ++i) {
changeActorOpacity(m_vectorFieldsActors[i], double(m_postProcResOpacSliders.at(i)->value()) / m_postProcResOpacSliders.at(i)->maximum());
m_vtkRenderer->AddActor(m_vectorFieldsActors.at(i));
}
m_vtkRenderer->ResetCamera();
m_vtkWidget->update();
}
void VisualizationWidget::setStreamlinesActors(QVector<vtkActor*> actors)
{
for (int i = 0; i < m_streamlinesActors.size(); ++i) {
m_vtkRenderer->RemoveActor(m_streamlinesActors.at(i));
}
m_streamlinesActors = actors;
for (int i = 0; i < m_streamlinesActors.size(); ++i) {
changeActorOpacity(m_streamlinesActors[i], double(m_streamLinesSlider->value()) / m_streamLinesSlider->maximum());
m_vtkRenderer->AddActor(m_streamlinesActors.at(i));
}
m_vtkRenderer->ResetCamera();
m_vtkWidget->update();
}
void VisualizationWidget::changeActorOpacity(vtkActor* actor, double opac)
{ 
actor->SetVisibility(opac > 0.05);
actor->GetMapper()->Modified();
actor->GetProperty()->SetOpacity(opac);
}
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