Zooming in on the surface results in stripes

[whereismymoney]

It is important to compute point normals, not just cell normals.
Without the point normals the behavior is bad and the renderer may crash on some systems.
I provided an example here

vtkPolyDataNormals appears to behave incorrectly

The sample code I provide here allows you to easily compare SetComputePointNormals(true) and SetComputePointNormals(false), so we can compare the correct behavior with the incorrect behavior, shown in this image: [image] Here is the code: #include <vtkActor.h> #include <vtkNew.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkPolyDataNormals.h> #include <vtkPolyDataReader.h> #include <vtkPolyDataMapper.h> #include <vtkCleanPolyData.h>…

This lets you compare SetComputePointNormals(true) and SetComputePointNormals(false).
-Matthias