Correct radius for starting sphere?

[mauigna06]

The multiplier is currently 1.5:

Slicer-SurfaceWrapSolidify/SegmentEditorWrapSolidify/SegmentEditorWrapSolidifyLib/SegmentEditorEffect.py

Lines 504 to 505 in f5b1679

	# to make sure the volume is fully included in the sphere, radius must be sqrt(2) times larger
	sphereSource.SetRadius(maxRadius*1.5)

But according to this link:
https://math.stackexchange.com/questions/2423669/sphere-and-inscribed-cube

I'm thinking the multiplier should be larger than sqrt(3), for example:

 # to make sure the volume is fully included in the sphere, radius must be sqrt(3) times larger 
 sphereSource.SetRadius(maxRadius*1.75)