ShrinkCube
vtk-examples/Cxx/GeometricObjects/ShrinkCube
Description¶
Generates a cube using vtkCubeSource, then a shrink filter is applied.
vtkShrinkFilter object shrinks cells composing an arbitrary data set towards their centroid. The centroid of a cell is computed as the average position of the cell points. Shrinking results in disconnecting the cells from one another.
Seealso
TessellatedBoxSource generates multiple quads or triangles per side.
Info
See Figure 5-17 in Chapter 5 the VTK Textbook.
Question
If you have a question about this example, please use the VTK Discourse Forum
Code¶
ShrinkCube.cxx
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkCubeSource.h>
#include <vtkDataSetMapper.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkShrinkFilter.h>
int main(int, char*[])
{
// Create a cube.
vtkNew<vtkCubeSource> cubeSource;
vtkNew<vtkShrinkFilter> shrink;
shrink->SetInputConnection(cubeSource->GetOutputPort());
shrink->SetShrinkFactor(.9);
// Create a mapper and actor.
vtkNew<vtkNamedColors> colors;
vtkNew<vtkDataSetMapper> mapper;
mapper->SetInputConnection(shrink->GetOutputPort());
vtkNew<vtkProperty> back;
back->SetColor(colors->GetColor3d("Tomato").GetData());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->EdgeVisibilityOn();
actor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
actor->SetBackfaceProperty(back);
// Create a renderer, render window, and interactor
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("Silver").GetData());
renderer->ResetCamera();
renderer->GetActiveCamera()->Azimuth(30);
renderer->GetActiveCamera()->Elevation(30);
renderer->ResetCameraClippingRange();
// Render and interact
renderWindow->SetWindowName("ShrinkCube");
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(ShrinkCube)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersGeneral
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping ShrinkCube: ${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(ShrinkCube MACOSX_BUNDLE ShrinkCube.cxx )
target_link_libraries(ShrinkCube 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(ShrinkCube MACOSX_BUNDLE ShrinkCube.cxx )
target_link_libraries(ShrinkCube PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS ShrinkCube
MODULES ${VTK_LIBRARIES}
)
endif()
Download and Build ShrinkCube¶
Click here to download ShrinkCube and its CMakeLists.txt file. Once the tarball ShrinkCube.tar has been downloaded and extracted,
cd ShrinkCube/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:
./ShrinkCube
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.