MultipleActors
vtk-examples/Cxx/Visualization/MultipleActors
Description¶
This example creates two spheres and renders them. The idea is to show that each object needs its own mapper and actor and then multiple actors can be added to a renderer.
Other languages
See (Java)
Question
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Code¶
MultipleActors.cxx
#include <vtkActor.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.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("Cornsilk").GetData());
// A renderer and render window
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("MultipleActors");
// An interactor
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene
renderer->AddActor(actor1);
renderer->AddActor(actor2);
renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());
// Render an image (lights and cameras are created automatically)
renderWindow->Render();
vtkNew<vtkInteractorStyleTrackballCamera> style;
renderWindowInteractor->SetInteractorStyle(style);
// Begin mouse interaction
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(MultipleActors)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping MultipleActors: ${VTK_NOT_FOUND_MESSAGE}")
return()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE})
add_executable(MultipleActors MACOSX_BUNDLE MultipleActors.cxx )
target_link_libraries(MultipleActors PRIVATE ${VTK_LIBRARIES})
else()
# 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(MultipleActors MACOSX_BUNDLE MultipleActors.cxx )
target_link_libraries(MultipleActors PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS MultipleActors
MODULES ${VTK_LIBRARIES}
)
endif()
Download and Build MultipleActors¶
Click here to download MultipleActors and its CMakeLists.txt file. Once the tarball MultipleActors.tar has been downloaded and extracted,
cd MultipleActors/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:
./MultipleActors
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.