Fix faces for unstructured grid

ParaView Support
1

I’ve created VTK dataset but only grid edges are visible:
plot.vtk (21.9 KB)

image
image1256×1062 305 KB

With Delaunay filter it’s fixed:

image
image1210×1024 80.5 KB

As I’ve checked in ASCII PLY output the original VTK has no faces (“element face 0”) while Delaunay processed VTK has them.

How could it be fixed in the input file without Delaunay filter?

2

Here is the VTK generation code:

...
         for (_xs,_ys,_zs) in zip(xs,ys,zs):
            # need to have 2 point or more
            #if len(_xs) <= 1:
            #    continue
            vtk_cells.InsertNextCell(len(_xs))
            for (x,y,z) in zip(_xs,_ys,_zs):
                pointId = vtk_points.InsertNextPoint(x, y, z)
                vtk_cells.InsertCellPoint(pointId)
...