dropped offset to 1 nanometer. adjusted position update margin of interpolator

dune/dorie/solver/operator_DG.hh

@@ -260,7 +260,7 @@ public:
 
         // position of quadrature point in global coordinates
         // add offset for parameter queries
-        const RF eps = 1e-7;
+        const RF eps = 1e-9;
         auto global_s = ig.inside().geometry().global(local_s);
         auto global_n = ig.outside().geometry().global(local_n);
         global_s = global_s.axpy(-eps,normal);

dune/dorie/solver/util_interpolator.hh

@@ -34,7 +34,7 @@ namespace Dune {
       const InterpolationMethod method;
 
       explicit InterpolatorBase(InterpolationMethod method_, const ParameterTree& config_, const Dune::MPIHelper& helper_, const int verbose_):
-      config(config_), helper(helper_), verbose(verbose_), eps(1e-8), initialized(false), method(method_)
+      config(config_), helper(helper_), verbose(verbose_), eps(1e-9), initialized(false), method(method_)
       {}
 
        RF evaluate(const Array& field, const Domain& pos)