> I'm not sure I understand your comment

Try to do the following with OpenSCAD:

    1. put a sphere and a torus somewhat close to each other
    2. find the shortest segment between the two surfaces
    3. place an infinite cylinder whose axis is aligned with the segment you just found
    4. fillet the cylinder with both the torus and the sphere along its intersection curve with each surface

This is very, very hard to do with OpenSCAD.