Vote: auto-refinement limits

[tzanio]

Following #285 and related discussions, what should be the default auto refinement limits in GLVis (i.e. what we show by default without the user pressing o)?

The current code for that is (see vsdata.cpp and vssolution.cpp):

int auto_ref_max = 16;
int auto_ref_max_surf_elem = 20000;
int ne = mesh->GetNE(), ref = 1;
while (ref < auto_ref_max && ne*(ref+1)*(ref+1) <= auto_ref_max_surf_elem) { ref++; }

The proposed alternative is (see #285 (comment))

int auto_ref_max = 16;
int auto_ref_min_surf_elem = 100000;
int auto_ref_max_surf_elem = 2000000;
int ne = mesh->GetNE(), ref = 1;
int autoref_max = min(max(ne*(order_ref+1)*(order_ref+1), auto_ref_min_surf_elem), auto_ref_max_surf_elem)
while (ref < auto_ref_max && ne*(ref+1)*(ref+1) <= autoref_max) { ref++; }

[tzanio]

The results are 5:2 in favor of the new algorithm.

This is implemented and will be merged in #285.