+ it's already computed in self._StepPrepareWithoutTaskManager()
+ it's time independent

+ already assembled in self._StepPrepareWithTaskManager()

+ Although the parameter is named maxh in netgen,
+ the maximum element diameter of the mesh violates this
+ restriction. Not seldom by more than 100%...
+ Reproduce, e.g., with unit cube and maxh=1

+ Solution: choose maxh= meshSize / j for j=1,2,... until satisfied

+ use m / |m| for building Q[m]