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.