Non-convex cells are not correctly renderer with OpenGL2 and Triangulate option in Geometry representation has no more effect
In PV 5.3, the Triangulate option is no more wired (it does nothing in case of OpenGL2 backend).
Problem is that non-convext polygons are not triangulated by the mapper as the comment claimed in vtkPVGeometryFilter.cxx:226
void vtkPVGeometryFilter::SetTriangulate(bool val)
{
...
// OpenGL2 doesn't need to triangulate in the geometry filter. The mapper doesit.
(void)val;
this->Triangulate = 0;
}