Can anyone explain what changed between 9.2.6 (on the left) and 9.4.1 (on the right) that would result in such a drastic difference in rendering?
I understand that I can tessellate and get better results, I am just surprised at the change.
Here’s the source code used to generate the images.
#include <vtkActor.h>
#include <vtkDataSetMapper.h>
#include <vtkDataSetReader.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkLookupTable.h>
#include <vtkNew.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
int
main(int argc, char **argv)
{
vtkNew<vtkDataSetReader> reader;
reader->SetFileName("quadraticQuads.vtk");
reader->Update();
vtkNew<vtkLookupTable> lut;
lut->SetHueRange(0.6667, 0.0);
vtkNew<vtkDataSetMapper> mapper;
mapper->SetInputConnection(reader->GetOutputPort());
mapper->SetLookupTable(lut);
mapper->ScalarVisibilityOn();
mapper->SetScalarRange(-1, 1);
mapper->SetInterpolateScalarsBeforeMapping(0);
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renwin;
renwin->AddRenderer(renderer);
vtkNew<vtkInteractorStyleTrackballCamera> style;
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetInteractorStyle(style);
iren->SetRenderWindow(renwin);
renderer->AddActor(actor);
renwin->Render();
iren->Start();
return 0;
}
Here’s the contents of the vtk file:
# vtk DataFile Version 4.2
vtk output
ASCII
DATASET UNSTRUCTURED_GRID
POINTS 25 double
1 0 0 1 0 0.5 1 0 1
1 0 1.5 1 0 2 0.7071067 0.7071067 0
0.7071067 0.7071067 0.5 0.7071067 0.7071067 1 0.7071067 0.7071067 1.5
0.7071067 0.7071067 2 0 1 0 0 1 0.5
0 1 1 0 1 1.5 0 1 2
-0.7071067 0.7071067 0 -0.7071067 0.7071067 0.5 -0.7071067 0.7071067 1
-0.7071067 0.7071067 1.5 -0.7071067 0.7071067 2 -1 0 0
-1 0 0.5 -1 0 1 -1 0 1.5
-1 0 2
CELLS 4 36
8 0 2 12 10 1 7 11 5
8 2 4 14 12 3 9 13 7
8 10 12 22 20 11 17 21 15
8 12 14 24 22 13 19 23 17
CELL_TYPES 4
23
23
23
23
POINT_DATA 25
SCALARS foo double
LOOKUP_TABLE default
1 1 1 1 1 0.7071067 0.7071067 0.7071067 0.7071067
0.7071067 0 0 0 0 0 -0.7071067 -0.7071067 -0.7071067
-0.7071067 -0.7071067 -1 -1 -1 -1 -1
