Step One: Select the Mesh The first and most crucial step when splitting a mesh is to select it. To do so, open your project in Blender and navigate to the 3D modeling workspace (the one with a cube, ...

We can start building our thing by making a cylinder mesh. From the top menu bar, select Add -> Mesh -> Cylinder and left click. A cylinder will appear at coordinates 0,0,0 in your scene.

It is not (strictly speaking) an addon for blender. It is instead a python script which can be executed from blender's text editor to build a mesh for an isosurface of the field function defined ...