RectilinearGrid of dimension <= 1 are not rendered
ParaView does not render anything when source is a 1D-rectilinear grid. So far, it looks like the only way to see the lines is to convert is to an unstructured grid (eg. use the Append Datasets filter) - test with attached grid .
Problem is that PVGeometryFilter uses vtkDataSetSurfaceFilter to generate the grid geometry. However, this filter only generates quads or triangle strips for >=2 dimensional grids.
Suggestion for a fix: use vtkRectilinearGridSurfaceFilter and vtkStructuredGridSurfaceFilter when dimension is < 2.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information