Initial commit

src/Cxx/Utilities/ColorMapToLUT.cxx

+#include <vtkActor.h>
+#include <vtkConeSource.h>
+#include <vtkDiscretizableColorTransferFunction.h>
+#include <vtkElevationFilter.h>
+#include <vtkInteractorStyleTrackballCamera.h>
+#include <vtkNamedColors.h>
+#include <vtkNew.h>
+#include <vtkPolyDataMapper.h>
+#include <vtkProperty.h>
+#include <vtkRenderWindow.h>
+#include <vtkRenderWindowInteractor.h>
+#include <vtkRenderer.h>
+// #include <vtkSphereSource.h>
+
+#include <array>
+
+namespace {
+vtkNew<vtkDiscretizableColorTransferFunction> getCTF();
+
+}
+
+int main(int, char*[])
+{
+  std::array<unsigned char, 4> bkg{82, 87, 110, 255};
+  vtkNew<vtkNamedColors> colors;
+  colors->SetColor("ParaViewBkg", bkg.data());
+
+  vtkNew<vtkRenderer> ren;
+  ren->SetBackground(colors->GetColor3d("ParaViewBkg").GetData());
+  vtkNew<vtkRenderWindow> renWin;
+  renWin->SetSize(640, 480);
+  renWin->SetWindowName("ColorMapToLUT");
+  renWin->AddRenderer(ren);
+  vtkNew<vtkRenderWindowInteractor> iRen;
+  iRen->SetRenderWindow(renWin);
+
+  vtkNew<vtkInteractorStyleTrackballCamera> style;
+  iRen->SetInteractorStyle(style);
+
+  // vtkNew<vtkSphereSource> sphere;
+  // sphere->SetThetaResolution(64);
+  // sphere->SetPhiResolution(32);
+  // auto bounds = sphere->GetOutput()->GetBounds();
+
+  vtkNew<vtkConeSource> cone;
+  cone->SetResolution(6);
+  cone->SetDirection(0, 1, 0);
+  cone->SetHeight(1);
+  cone->Update();
+  auto bounds = cone->GetOutput()->GetBounds();
+
+  vtkNew<vtkElevationFilter> elevation_filter;
+  elevation_filter->SetLowPoint(0, bounds[2], 0);
+  elevation_filter->SetHighPoint(0, bounds[3], 0);
+  elevation_filter->SetInputConnection(cone->GetOutputPort());
+  // elevation_filter->SetInputConnection(sphere->GetOutputPort());
+
+  auto ctf = getCTF();
+
+  vtkNew<vtkPolyDataMapper> mapper;
+  mapper->SetInputConnection(elevation_filter->GetOutputPort());
+  mapper->SetLookupTable(ctf);
+  mapper->SetColorModeToMapScalars();
+  mapper->InterpolateScalarsBeforeMappingOn();
+
+  vtkNew<vtkActor> actor;
+  actor->SetMapper(mapper);
+
+  ren->AddActor(actor);
+
+  renWin->Render();
+  iRen->Start();
+
+  return EXIT_SUCCESS;
+}
+
+namespace {
+
+vtkNew<vtkDiscretizableColorTransferFunction> getCTF()
+{
+  // name: Fast, creator: Francesca Samsel, file name: Fast.xml
+  vtkNew<vtkDiscretizableColorTransferFunction> ctf;
+
+  ctf->SetColorSpaceToLab();
+  ctf->SetScaleToLinear();
+
+  ctf->SetNanColor(0, 0, 0);
+
+  ctf->AddRGBPoint(0, 0.08800000000000002, 0.18810000000000007, 0.55);
+  ctf->AddRGBPoint(0.16144, 0.21989453864645603, 0.5170512023315895,
+                   0.7093372214401806);
+  ctf->AddRGBPoint(0.351671, 0.5048913252297864, 0.8647869538833338,
+                   0.870502284878942);
+  ctf->AddRGBPoint(0.501285, 1, 1, 0.83);
+  ctf->AddRGBPoint(0.620051, 0.9418960444346476, 0.891455547964053,
+                   0.5446035798119958);
+  ctf->AddRGBPoint(0.835408342528245, 0.75, 0.44475, 0.255);
+  ctf->AddRGBPoint(1, 0.56, 0.055999999999999994, 0.055999999999999994);
+
+  ctf->SetNumberOfValues(7);
+  ctf->DiscretizeOff();
+
+  return ctf;
+}
+
+} // namespace