UnitSphere mesh?

Question

did the UnitSphere mesh from the FEniCS tutorial section 4.1 not make it to version 1.2.0 ?
Neither UnitSquare nor UnitSquareMesh seems to exist in FEniCS 1.2.0.
best, achim.

Answer 1

In Dolfin 1.2, its base class has been changed to dolfin.cpp.mesh.CSGPrimitive3D with different algorithm to generate mesh (in my opinion).
You can use the following to generate the unit sphere mesh:

center = Point()
sphere = Sphere(center,1)
mesh = Mesh(sphere,20) # 20 specify the resolution of the mesh

Answer 2

UnitSquareMesh is available (UnitSquare is deprecated).

To create a unit sphere with the development version (1.2+) see dolfin/demo/documented/built-in_meshes/. You will require CGAL.