ProjectedTexture
vtk-examples/Cxx/Texture/ProjectedTexture
Description¶
vtkProjectedTexture is tricky to set up. Picking the right parameters will take some iterations. The example uses vtkFrustumSource to help understand the parameters.
Cite
This example was inspired by Thomas Kilgus, German Cancer Research Center (DKFZ), Div. Medical and Biological Informatics, Junior group: Computer-assisted Interventions (E131), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
Question
If you have a question about this example, please use the VTK Discourse Forum
Code¶
ProjectedTexture.cxx
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkFrustumSource.h>
#include <vtkImageData.h>
#include <vtkImageReader2.h>
#include <vtkImageReader2Factory.h>
#include <vtkMath.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPlanes.h>
#include <vtkPointData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProjectedTexture.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkTexture.h>
#include <vtkBYUReader.h>
#include <vtkOBJReader.h>
#include <vtkPLYReader.h>
#include <vtkPolyDataReader.h>
#include <vtkSTLReader.h>
#include <vtkSphereSource.h>
#include <vtkXMLPolyDataReader.h>
#include <vtksys/SystemTools.hxx>
namespace {
vtkSmartPointer<vtkPolyData> ReadPolyData(const char* fileName);
}
int main(int argc, char* argv[])
{
if (argc < 3)
{
std::cout << "Usage: " << argv[0] << " polydata texture" << std::endl;
return EXIT_FAILURE;
}
vtkSmartPointer<vtkPolyData> polyData = ReadPolyData(argc > 1 ? argv[1] : "");
;
vtkNew<vtkImageReader2Factory> readerFactory;
vtkSmartPointer<vtkImageReader2> textureFile;
textureFile.TakeReference(readerFactory->CreateImageReader2(argv[2]));
textureFile->SetFileName(argv[2]);
textureFile->Update();
vtkNew<vtkNamedColors> colors;
double center[3];
polyData->GetCenter(center);
std::cout << "Center: " << center[0] << ", " << center[1] << ", " << center[2]
<< std::endl;
vtkNew<vtkCamera> camera;
camera->SetPosition(center[0], center[1] + .0375, center[2] + .5);
camera->SetFocalPoint(center[0], center[1] + .0375, center[2]);
camera->Azimuth(-45);
camera->Roll(-90);
camera->SetClippingRange(.5, .6);
double planesArray[24];
camera->GetFrustumPlanes(1.0, planesArray);
// Settings for vtkProjectedTexture
double aspect[3];
aspect[1] = 1.0;
aspect[2] = 1.0;
aspect[0] = 1.0;
//(1.0/ (vtkMath::RadiansFromDegrees(std::tan(camera->GetViewAngle()))))
/// 2.0;
std::cout << "Aspect: " << aspect[0] << ", " << aspect[1] << ", " << aspect[2]
<< std::endl;
vtkNew<vtkProjectedTexture> projectedTexture;
projectedTexture->SetAspectRatio(aspect);
projectedTexture->SetPosition(camera->GetPosition());
projectedTexture->SetFocalPoint(camera->GetFocalPoint());
projectedTexture->SetUp(camera->GetViewUp()[0], camera->GetViewUp()[1],
camera->GetViewUp()[2]);
projectedTexture->SetInputData(
polyData); // this can be the same as the one to project on
projectedTexture->Update();
// Map Texture on Surface
polyData->GetPointData()->SetTCoords(
projectedTexture->GetOutput()->GetPointData()->GetTCoords());
vtkNew<vtkTexture> texture;
texture->SetInputData(textureFile->GetOutput());
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputData(polyData);
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->SetTexture(texture);
vtkNew<vtkPlanes> planes;
planes->SetFrustumPlanes(planesArray);
vtkNew<vtkFrustumSource> frustumSource;
frustumSource->ShowLinesOff();
frustumSource->SetPlanes(planes);
frustumSource->Update();
vtkNew<vtkPolyDataMapper> frustumMapper;
frustumMapper->SetInputConnection(frustumSource->GetOutputPort());
vtkNew<vtkActor> frustumActor;
frustumActor->SetMapper(frustumMapper);
frustumActor->GetProperty()->EdgeVisibilityOn();
frustumActor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
frustumActor->GetProperty()->SetOpacity(.5);
frustumActor->GetProperty()->SetRepresentationToWireframe();
vtkNew<vtkRenderer> renderer;
renderer->AddActor(actor);
renderer->AddActor(frustumActor);
renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
renderer->SetActiveCamera(camera);
camera->Azimuth(180);
camera->Roll(-90);
renderer->ResetCameraClippingRange();
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("ProjectedTexture");
vtkNew<vtkRenderWindowInteractor> renWinInteractor;
renWinInteractor->SetRenderWindow(renderWindow);
renderWindow->Render();
renWinInteractor->Start();
return EXIT_SUCCESS;
}
namespace {
vtkSmartPointer<vtkPolyData> ReadPolyData(const char* fileName)
{
vtkSmartPointer<vtkPolyData> polyData;
std::string extension =
vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
if (extension == ".ply")
{
vtkNew<vtkPLYReader> reader;
reader->SetFileName(fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".vtp")
{
vtkNew<vtkXMLPolyDataReader> reader;
reader->SetFileName(fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".obj")
{
vtkNew<vtkOBJReader> reader;
reader->SetFileName(fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".stl")
{
vtkNew<vtkSTLReader> reader;
reader->SetFileName(fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".vtk")
{
vtkNew<vtkPolyDataReader> reader;
reader->SetFileName(fileName);
reader->Update();
polyData = reader->GetOutput();
}
else if (extension == ".g")
{
vtkNew<vtkBYUReader> reader;
reader->SetGeometryFileName(fileName);
reader->Update();
polyData = reader->GetOutput();
}
else
{
vtkNew<vtkSphereSource> source;
source->Update();
polyData = source->GetOutput();
}
return polyData;
}
} // namespace
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(ProjectedTexture)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersModeling
vtkFiltersSources
vtkIOGeometry
vtkIOImage
vtkIOLegacy
vtkIOPLY
vtkIOXML
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping ProjectedTexture: ${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(ProjectedTexture MACOSX_BUNDLE ProjectedTexture.cxx )
target_link_libraries(ProjectedTexture PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(ProjectedTexture MACOSX_BUNDLE ProjectedTexture.cxx )
target_link_libraries(ProjectedTexture PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS ProjectedTexture
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build ProjectedTexture¶
Click here to download ProjectedTexture and its CMakeLists.txt file. Once the tarball ProjectedTexture.tar has been downloaded and extracted,
cd ProjectedTexture/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:
./ProjectedTexture
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.