[Gmsh] Cannot build 3D FEM mesh for the sphere

[Alexander Kalinin]

Hello!

I am new to gmsh and I am trying to build very simple 3D FEM mesh for the
sphere. I have downloaded latest version of gmsh (2.5.0), next I downloaded
sphere geometry from the wiki:
https://geuz.org/trac/gmsh/attachment/wiki/OldExamples/sphere.geo, loaded
geometry and just click on the Mesh/3D button.

The 2D mesh was created successfully. But I cannot see 3D mesh. The
Tools/Statistics shows that there no tetrahedra was created.

Could you please help me, what is the problem and how to create 3D FEM mesh
for the sphere?

Thank you,
Alexander.
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