HideActor
Repository source: HideActor
Description¶
Display two spheres, then hide one, then hide both.
Question
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Code¶
HideActor.cxx
#include <vtkActor.h>
#include <vtkInteractorStyleSwitch.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkPropCollection.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
// Sphere 1
vtkNew<vtkSphereSource> sphereSource1;
sphereSource1->SetCenter(0.0, 0.0, 0.0);
sphereSource1->SetRadius(4.0);
sphereSource1->Update();
vtkNew<vtkPolyDataMapper> mapper1;
mapper1->SetInputConnection(sphereSource1->GetOutputPort());
vtkNew<vtkActor> actor1;
actor1->SetMapper(mapper1);
actor1->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());
// Sphere 2
vtkNew<vtkSphereSource> sphereSource2;
sphereSource2->SetCenter(10.0, 0.0, 0.0);
sphereSource2->SetRadius(3.0);
sphereSource2->Update();
// Create a mapper.
vtkNew<vtkPolyDataMapper> mapper2;
mapper2->SetInputConnection(sphereSource2->GetOutputPort());
// Create an actor.
vtkNew<vtkActor> actor2;
actor2->SetMapper(mapper2);
actor2->GetProperty()->SetColor(colors->GetColor3d("Honeydew").GetData());
// A renderer and render window
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("HideActor");
// An interactor.
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene.
renderer->AddActor(actor1);
renderer->AddActor(actor2);
renderer->SetBackground(colors->GetColor3d("LightSlateGray").GetData());
// Render an image (lights and cameras are created automatically).
renderWindow->Render();
vtkNew<vtkInteractorStyleSwitch> style;
renderWindowInteractor->SetInteractorStyle(style);
// renderWindowInteractor->Start();
// Change the background color so we know we are done with the original two
// sphere display.
renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());
// Hide one actor at a time.
vtkPropCollection* props =
renderer->GetViewProps(); // iterate through and set each visibility to 0.
props->InitTraversal();
for (int i = 0; i < props->GetNumberOfItems(); i++)
{
props->GetNextProp()->VisibilityOff();
renderer->ResetCamera();
renderWindow->Render();
}
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(HideActor)
find_package(VTK COMPONENTS
CommonColor
CommonCore
FiltersSources
InteractionStyle
RenderingContextOpenGL2
RenderingCore
RenderingFreeType
RenderingGL2PSOpenGL2
RenderingOpenGL2
)
if (NOT VTK_FOUND)
message(FATAL_ERROR "HideActor: Unable to find the VTK build folder.")
endif()
# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(HideActor MACOSX_BUNDLE HideActor.cxx )
target_link_libraries(HideActor PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS HideActor
MODULES ${VTK_LIBRARIES}
)
Download and Build HideActor¶
Click here to download HideActor and its CMakeLists.txt file. Once the tarball HideActor.tar has been downloaded and extracted,
cd HideActor/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./HideActor
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.