> It would have been (a lot) easier to find if there was such a code:
I would suggest to check that norm==0 (sharp float comparison) and throw
an exception with a more detailed explanation --
if(norm==0) throw runtime_error(("Zero distance between spheres
#"+lexical_cast<string>(c->getId1())+" and
#"+lexical_cast<string>(c->getId2())+".").c_str())
Cheers, v.
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