PlateVibration

VTKExamples/Cxx/VisualizationAlgorithms/PlateVibration

Description¶

The motion of a vibrating beam is shown. The original undeformed outline is shown as a wireframe.

Other Languages

See (Python)

Question

Code¶

PlateVibration.cxx

// Translated from vib.tcl

#include <vtkActor.h>
#include <vtkCallbackCommand.h>
#include <vtkCamera.h>
#include <vtkDataSetMapper.h>
#include <vtkLookupTable.h>
#include <vtkNamedColors.h>
#include <vtkOutlineFilter.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkPolyDataNormals.h>
#include <vtkProp3D.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkVectorDot.h>
#include <vtkWarpVector.h>

#include <array>
#include <string>

int main(int argc, char* argv[])
{
auto Scale = [](std::vector<double>& v, double scale) {
std::transform(std::begin(v), std::end(v), std::begin(v),
[=](double const& n) { return n / scale; });
return;
};

if (argc < 2)
{
std::cout << "Usage: " << argv[0] << " filename" << std::endl;
std::cout << "where: filename is the file plate.vtk." << std::endl;
std::cout
<< "Produces figure 6-14(a) Beam displacement from the VTK Textbook."
<< std::endl;
return EXIT_FAILURE;
}

std::string fileName = argv[1];

vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();

// Set the background color and plate color.
std::array<unsigned char , 4> bar{{255, 160, 140}};
colors->SetColor("PlateColor", bar.data());
std::array<unsigned char , 4> bkg{{65, 99, 149}};
colors->SetColor("BkgColor", bkg.data());

//
plate->SetFileName(fileName.c_str());
plate->Update();
double bounds[6];
plate->GetOutput()->GetBounds(bounds);
plate->SetVectorsName("mode2");

vtkSmartPointer<vtkPolyDataNormals> normals =
vtkSmartPointer<vtkPolyDataNormals>::New();
normals->SetInputConnection(plate->GetOutputPort());
vtkSmartPointer<vtkWarpVector> warp = vtkSmartPointer<vtkWarpVector>::New();
warp->SetInputConnection(normals->GetOutputPort());
warp->SetScaleFactor(0.5);
vtkSmartPointer<vtkVectorDot> color = vtkSmartPointer<vtkVectorDot>::New();
color->SetInputConnection(warp->GetOutputPort());
vtkSmartPointer<vtkDataSetMapper> plateMapper =
vtkSmartPointer<vtkDataSetMapper>::New();
plateMapper->SetInputConnection(warp->GetOutputPort());
vtkSmartPointer<vtkActor> plateActor = vtkSmartPointer<vtkActor>::New();
plateActor->SetMapper(plateMapper);
plateActor->GetProperty()->SetColor(
colors->GetColor3d("PlateColor").GetData());
plateActor->RotateX(-90);

// Create the outline.
//
vtkSmartPointer<vtkOutlineFilter> outline =
vtkSmartPointer<vtkOutlineFilter>::New();
outline->SetInputConnection(plate->GetOutputPort());
vtkSmartPointer<vtkPolyDataMapper> spikeMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
spikeMapper->SetInputConnection(outline->GetOutputPort());
vtkSmartPointer<vtkActor> outlineActor = vtkSmartPointer<vtkActor>::New();
outlineActor->SetMapper(spikeMapper);
outlineActor->RotateX(-90);
outlineActor->GetProperty()->SetColor(colors->GetColor3d("White").GetData());

// Create the RenderWindow, Renderer and both Actors
//
vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();

vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
iren->SetRenderWindow(renWin);

// Add the actors to the renderer, set the background and size
//
renWin->SetSize(500, 500);

// Render the image.
renWin->Render();
ren->SetBackground(colors->GetColor3d("BkgColor").GetData());
// This closely matches the original illustration.
ren->GetActiveCamera()->SetPosition(-3.7, 13, 15.5);
ren->ResetCameraClippingRange();

iren->Start();

return EXIT_SUCCESS;
}


CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(PlateVibration)

find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersCore
vtkFiltersGeneral
vtkFiltersModeling
vtkIOLegacy
vtkInteractionStyle
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping PlateVibration: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION:${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE}) add_executable(PlateVibration MACOSX_BUNDLE PlateVibration.cxx ) target_link_libraries(PlateVibration PRIVATE${VTK_LIBRARIES})
else ()
# include all components
target_link_libraries(PlateVibration PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS PlateVibration MODULES${VTK_LIBRARIES}
)
endif ()


cd PlateVibration/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:

./PlateVibration


WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.