Central place for geometry intersection tolerances

In the GeometryIntersection algorithms we define a baseEps_ = 1.5e-7 in every specialization. I think it could be beneficial to define the tolerance once in a central place. Something like

template<typename ctype>
class Precision
{
public:

    static ctype relativeTolerance()
    { return 1.5e-7; }   // or get from parameter tree as a static const variable? or from configure step?
};

Personally, I would be in favor of the solution with the parameter tree such that users can change the tolerance via the input file.