FastSplatter
VTKExamples/Cxx/Visualization/FastSplatter
Code¶
FastSplatter.cxx
#include <vtkVersion.h> #include "vtkImageData.h" #include "vtkImageShiftScale.h" #include "vtkFastSplatter.h" #include "vtkImageViewer2.h" #include "vtkPoints.h" #include "vtkPolyData.h" #include "vtkRenderer.h" #include "vtkRenderWindow.h" #include "vtkRenderWindowInteractor.h" #include "vtkSmartPointer.h" #include <cmath> const int SPLAT_IMAGE_SIZE = 100; int main(int, char *[]) { // For the purposes of this example we'll build the splat image by // hand. vtkSmartPointer<vtkImageData> splatImage = vtkSmartPointer<vtkImageData>::New(); splatImage->SetDimensions(SPLAT_IMAGE_SIZE, SPLAT_IMAGE_SIZE, 1); #if VTK_MAJOR_VERSION <= 5 splatImage->SetScalarTypeToFloat(); splatImage->SetNumberOfScalarComponents(1); splatImage->AllocateScalars(); #else splatImage->AllocateScalars(VTK_FLOAT,1); #endif for (int i = 0; i < SPLAT_IMAGE_SIZE; ++i) { for (int j = 0; j < SPLAT_IMAGE_SIZE; ++j) { double xCoord = 1 - fabs( (i - SPLAT_IMAGE_SIZE/2) / (SPLAT_IMAGE_SIZE/2.0) ); double yCoord = 1 - fabs( (j - SPLAT_IMAGE_SIZE/2) / (SPLAT_IMAGE_SIZE/2.0) ); splatImage->SetScalarComponentFromDouble(i, j, 0, 0, xCoord * yCoord ); } } vtkSmartPointer<vtkPolyData> splatPoints = vtkSmartPointer<vtkPolyData>::New(); vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->SetNumberOfPoints( 5 ); double point[3]; point[0] = 0; point[1] = 0; point[2] = 0; points->SetPoint( 0, point ); point[0] = 1; point[1] = 1; point[2] = 0; points->SetPoint( 1, point ); point[0] = -1; point[1] = 1; point[2] = 0; points->SetPoint( 2, point ); point[0] = 1; point[1] = -1; point[2] = 0; points->SetPoint( 3, point ); point[0] = -1; point[1] = -1; point[2] = 0; points->SetPoint( 4, point ); splatPoints->SetPoints(points); vtkSmartPointer<vtkFastSplatter> splatter = vtkSmartPointer<vtkFastSplatter>::New(); #if VTK_MAJOR_VERSION <= 5 splatter->SetInput( splatPoints ); splatter->SetInput(1, splatImage ); #else splatter->SetInputData(splatPoints ); splatter->SetInputData(1, splatImage ); #endif splatter->SetOutputDimensions( 2*SPLAT_IMAGE_SIZE, 2*SPLAT_IMAGE_SIZE, 1 ); // The image viewers and writers are only happy with unsigned char // images. This will convert the floats into that format. vtkSmartPointer<vtkImageShiftScale> resultScale = vtkSmartPointer<vtkImageShiftScale>::New(); resultScale->SetOutputScalarTypeToUnsignedChar(); resultScale->SetShift(0); resultScale->SetScale(255); resultScale->SetInputConnection( splatter->GetOutputPort() ); splatter->Update(); resultScale->Update(); // Set up a viewer for the image. vtkImageViewer and // vtkImageViewer2 are convenient wrappers around vtkActor2D, // vtkImageMapper, vtkRenderer, and vtkRenderWindow. All you need // to supply is the interactor and hooray, Bob's your uncle. vtkSmartPointer<vtkImageViewer2> imageViewer = vtkSmartPointer<vtkImageViewer2>::New(); imageViewer->SetInputConnection( resultScale->GetOutputPort() ); imageViewer->SetColorLevel(127); imageViewer->SetColorWindow(255); vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New(); imageViewer->SetupInteractor(iren); imageViewer->Render(); imageViewer->GetRenderer()->ResetCamera(); imageViewer->Render(); iren->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(FastSplatter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(FastSplatter MACOSX_BUNDLE FastSplatter.cxx) target_link_libraries(FastSplatter ${VTK_LIBRARIES})
Download and Build FastSplatter¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download FastSplatter and its CMakeLists.txt file. Once the tarball FastSplatter.tar has been downloaded and extracted,
cd FastSplatter/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:
./FastSplatter
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.