How can I extract a polygon with the same shape as a 3d glyph?

I tried running the vtp example via the following link.

https://vtk.org/Wiki/VTK/Examples/Cxx/IO/WriteVTP

However, paraview of the output of .vtp shows 3d glyphs. But points and the surface seem to be completely different.

[3d glyphs]

[points]
image

[surface]
image

How can I extract a polygon with the same shape as a 3d glyph?

thank you