I am trying the new vtkFastLabeledDataMapper in vtk9.5.0rc1. The documentation of the class sounds like it is a replacement of the vtkLabeledDataMapper, so I tried to adapt one of the VTK-Examples to use the vtkFastLabeledDataMapper.
I used the LabelContours example (https://examples.vtk.org/site/Cxx/Visualization/LabelContours/) and replaced the mapper and the actor. Here is the diff compared to the current master of the VTK-Examples repo:
diff --git a/src/Cxx/Visualization/LabelContours.cxx b/src/Cxx/Visualization/LabelContours.cxx
index 306e9c0a4f4..8a9907523c7 100644
--- a/src/Cxx/Visualization/LabelContours.cxx
+++ b/src/Cxx/Visualization/LabelContours.cxx
@@ -4,7 +4,7 @@
#include <vtkContourFilter.h>
#include <vtkDataArray.h>
#include <vtkDoubleArray.h>
-#include <vtkLabeledDataMapper.h>
+#include <vtkFastLabeledDataMapper.h>
#include <vtkLookupTable.h>
#include <vtkMinimalStandardRandomSequence.h>
#include <vtkNamedColors.h>
@@ -214,7 +214,7 @@ int main(int argc, char* argv[])
surface->SetMapper(surfaceMapper);
// The labeled data mapper will place labels at the points.
- vtkNew<vtkLabeledDataMapper> labelMapper;
+ vtkNew<vtkFastLabeledDataMapper> labelMapper;
labelMapper->SetFieldDataName("Isovalues");
labelMapper->SetInputData(labelPolyData);
labelMapper->SetLabelModeToLabelScalars();
@@ -222,7 +222,7 @@ int main(int argc, char* argv[])
labelMapper->GetLabelTextProperty()->SetColor(
colors->GetColor3d("Gold").GetData());
- vtkNew<vtkActor2D> isolabels;
+ vtkNew<vtkActor> isolabels;
isolabels->SetMapper(labelMapper);
// Create a renderer and render window.
Compiling and running the changed code, does not show any labels. I get this output:
Do I need to make additional changes to the example code to get vtkFastLabeledDataMapper working or are there limitiations to the functionality of the class compared to vtkLabeledDataMapper?